1993 Chevrolet K2500 Differential Ring and Pinions

Your 1993 Chevrolet K2500 might be the best vehicle you’ve ever owned. Or you may just be struggling to keep it highway-approved. No matter the situation, Advance Auto Parts has the Differential Ring and Pinions you desperately need.

We currently carry 59 Differential Ring and Pinions to choose from for your 1993 Chevrolet K2500, and our inventory prices range from as little as $235.99 up to $584.99.

On top of low prices, Advance Auto Parts offers 3 different trusted brands of Differential Ring and Pinions for the 1993 Chevrolet K2500. We only sell parts from trusted brands like USA Standard Gear so that you can find quality parts you can count on.

Have parts delivered straight to your home, or find the nearest Advance Auto Parts store to check out our Differential Ring and Pinions stock in-person!

Differential Ring and Pinions for Your 1993 Chevrolet K2500

USA Standard Gear – Ring & Pinion Gear Set For 10.5" GM 14 Bolt Truck In A 3.73 Ratio (Part No.36182)

Ring & Pinion Gear Set For 10.5" GM 14 Bolt Truck In A 3.73 Ratio

from

$434.99
USA Standard ring & pinion sets are the right choice to add confidence to your install. USA Standard Gear offers a full line of ring & pinion sets for a variety of common & hard to find applications. USA standard gear offers a standard one year warranty against defects on their ring & pinion sets.

Product Features:
  • Fits GM 10.5″ GM 14 bolt truck
  • 10.50″ ring gear diameter
  • 30 spline pinion
  • 12 ring gear bolts
  • 3.73 ratio
See More

Yukon Gear – High Performance Ring & Pinion Gear Set For GM 8.25" IFS Reverse Rotation In A 3.73 Ratio (Part No.24489)

High Performance Ring & Pinion Gear Set For GM 8.25" IFS Reverse Rotation In A 3.73 Ratio

from

$584.99
Yukon Ring & Pinion sets give you the confidence of knowing you’re running gears designed for the harshest of conditions. Whether it’s on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance & quality. Yukon uses the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon ring & pinion sets come standard with a one-year warranty. 2010 GM 8.25IFS Front ends equipped w/ factory 3.08 gear will need a new carrier when changing ratio. When purchasing 3.42 & up gears for a factory 3.08 application you must also purchase a YC G26018131 case with it. Deck Height w/ 3.08 Ratio 1.780″ Deck height w/ 3.42 & up Ratio 1.920″.

Product Features:
  • Fits 2013 and down GM 8.25″ IFS
  • 8.25″ ring gear diameter
  • 30 spline pinion
  • 10 ring gear bolts
  • 3.73 ratio
See More

Yukon Gear – High Performance Ring & Pinion Gear Set For GM 9.25" IFS Reverse Rotation In A 5.13 Ratio (Part No.24164)

High Performance Ring & Pinion Gear Set For GM 9.25" IFS Reverse Rotation In A 5.13 Ratio

from

$534.99
Yukon Ring & Pinion sets give you the confidence of knowing you’re running gears designed for the harshest of conditions. Whether it’s on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance & quality. Yukon uses the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon ring & pinion sets come standard with a one-year warranty.

Product Features:
  • Fits GM 9.25″ front
  • 9.25″ ring gear
  • 30 spline pinion
  • 12 ring gear bolts
  • 5.13 ratio
See More

Yukon Gear – High Performance Ring & Pinion Gear Set For GM 8.25" IFS Reverse Rotation In A 3.42 Ratio (Part No.24488)

High Performance Ring & Pinion Gear Set For GM 8.25" IFS Reverse Rotation In A 3.42 Ratio

from

$519.99
Yukon Ring & Pinion sets give you the confidence of knowing you’re running gears designed for the harshest of conditions. Whether it’s on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance & quality. Yukon uses the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon ring & pinion sets come standard with a one-year warranty. 2010 GM 8.25IFS Front ends equipped w/ factory 3.08 gear will need a new carrier when changing ratio. When purchasing 3.42 & up gears for a factory 3.08 application you must also purchase a YC G26018131 case with it. Deck Height w/ 3.08 Ratio 1.780″ Deck height w/ 3.42 & up Ratio 1.920″.

Product Features:
  • Fits 2013 and down GM 8.25″ IFS
  • 8.25″ ring gear diameter
  • 30 spline pinion
  • 10 ring gear bolts
  • 3.42 ratio
See More

Yukon Gear – High Performance Ring & Pinion Gear Set For 10.5" GM 14 Bolt Truck In A 3.42 Ratio (Part No.24466)

High Performance Ring & Pinion Gear Set For 10.5" GM 14 Bolt Truck In A 3.42 Ratio

from

$505.99
Yukon Ring & Pinion sets give you the confidence of knowing you’re running gears designed for the harshest of conditions. Whether it’s on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance & quality. Yukon uses the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon ring & pinion sets come standard with a one-year warranty.

Product Features:
  • Fits GM 10.5″ GM 14 bolt truck
  • 10.50″ ring gear diameter
  • 30 spline pinion
  • 12 ring gear bolts
  • 3.42 ratio
See More

Yukon Gear – High Performance Ring & Pinion Gear Set For GM 9.25" IFS Reverse Rotation In A 5.38 Ratio (Part No.24165)

High Performance Ring & Pinion Gear Set For GM 9.25" IFS Reverse Rotation In A 5.38 Ratio

from

$499.99
Yukon Ring & Pinion sets give you the confidence of knowing you’re running gears designed for the harshest of conditions. Whether it’s on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance & quality. Yukon uses the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon ring & pinion sets come standard with a one-year warranty.

Product Features:
  • Fits GM 9.25″ front
  • 9.25″ ring gear
  • 30 spline pinion
  • 12 ring gear bolts
  • 5.38 ratio
See More

Yukon Gear – Ring and Pinion Kit (Part No.24657)

Ring and Pinion Kit

from

$489.99
Ring and Pinion Kit

Yukon Gear – High Performance Ring & Pinion Gear Set For GM 9.25" IFS Reverse Rotation In A 4.88 Ratio (Part No.24500)

High Performance Ring & Pinion Gear Set For GM 9.25" IFS Reverse Rotation In A 4.88 Ratio

from

$477.99
Yukon Ring & Pinion sets give you the confidence of knowing you’re running gears designed for the harshest of conditions. Whether it’s on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance & quality. Yukon uses the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon ring & pinion sets come standard with a one-year warranty.

Product Features:
  • Fits GM 9.25″ front
  • 9.25″ ring gear
  • 30 spline pinion
  • 12 ring gear bolts
  • 4.88 ratio
See More

Yukon Gear – High Performance Ring & Pinion "Thick" Gear Set For 10.5" GM 14 Bolt Truck In A 5.38 Ratio (Part No.24140)

High Performance Ring & Pinion "Thick" Gear Set For 10.5" GM 14 Bolt Truck In A 5.38 Ratio

from

$464.99
Yukon Ring & Pinion sets give you the confidence of knowing you’re running gears designed for the harshest of conditions. Whether it’s on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance & quality. Yukon uses the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon ring & pinion sets come standard with a one-year warranty. This is a thick gear for a 4.10 & down carrier.

Product Features:
  • Fits GM 10.5″ GM 14 bolt truck
  • 10.50″ ring gear diameter
  • 30 spline pinion
  • 12 ring gear bolts
  • 5.38 ratio
  • Thick gear set for 4.11 and down carrier
See More

Yukon Gear – High Performance Ring & Pinion Gear Set For GM 9.5" In A 4.56 Ratio (Part No.24168)

High Performance Ring & Pinion Gear Set For GM 9.5" In A 4.56 Ratio

from

$459.99
Yukon Ring & Pinion sets give you the confidence of knowing you’re running gears designed for the harshest of conditions. Whether it’s on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance & quality. Yukon uses the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon ring & pinion sets come standard with a one-year warranty.

Product Features:
  • Fits GM 9.5″
  • 9.50″ ring gear diameter
  • 30 spline pinion
  • 12 ring gear bolts
  • 4.56 ratio
See More

Yukon Gear – High Performance Ring & Pinion Gear Set For GM 8.25" IFS Reverse Rotation In A 4.88 Ratio (Part No.24155)

High Performance Ring & Pinion Gear Set For GM 8.25" IFS Reverse Rotation In A 4.88 Ratio

from

$459.99
Yukon Ring & Pinion sets give you the confidence of knowing you’re running gears designed for the harshest of conditions. Whether it’s on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance & quality. Yukon uses the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon ring & pinion sets come standard with a one-year warranty. 2010 GM 8.25IFS Front ends equipped w/ factory 3.08 gear will need a new carrier when changing ratio. When purchasing 3.42 & up gears for a factory 3.08 application you must also purchase a YC G26018131 case with it. Deck Height w/ 3.08 Ratio 1.780″ Deck height w/ 3.42 & up Ratio 1.920″.

Product Features:
  • Fits 2013 and down GM 8.25″ IFS
  • 8.25″ ring gear diameter
  • 30 spline pinion
  • 10 ring gear bolts
  • 4.88 ratio
See More

Yukon Gear – High Performance Ring & Pinion Gear Set For GM 9.5" In A 4.88 Ratio (Part No.24169)

High Performance Ring & Pinion Gear Set For GM 9.5" In A 4.88 Ratio

from

$454.99
Yukon Ring & Pinion sets give you the confidence of knowing you’re running gears designed for the harshest of conditions. Whether it’s on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance & quality. Yukon uses the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon ring & pinion sets come standard with a one-year warranty.

Product Features:
  • Fits GM 9.5″
  • 9.50″ ring gear diameter
  • 30 spline pinion
  • 12 ring gear bolts
  • 4.88 ratio
See More

Yukon Gear – High Performance Ring & Pinion Gear Set For GM 9.25" IFS Reverse Rotation In A 3.42 Ratio (Part No.24496)

High Performance Ring & Pinion Gear Set For GM 9.25" IFS Reverse Rotation In A 3.42 Ratio

from

$454.99
Yukon Ring & Pinion sets give you the confidence of knowing you’re running gears designed for the harshest of conditions. Whether it’s on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance & quality. Yukon uses the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon ring & pinion sets come standard with a one-year warranty.

Product Features:
  • Fits GM 9.25″ front
  • 9.25″ ring gear
  • 30 spline pinion
  • 12 ring gear bolts
  • 3.42 ratio
See More

Yukon Gear – High Performance Ring & Pinion Gear Set For GM 9.25" IFS Reverse Rotation In A 4.11 Ratio (Part No.24498)

High Performance Ring & Pinion Gear Set For GM 9.25" IFS Reverse Rotation In A 4.11 Ratio

from

$454.99
Yukon Ring & Pinion sets give you the confidence of knowing you’re running gears designed for the harshest of conditions. Whether it’s on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance & quality. Yukon uses the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon ring & pinion sets come standard with a one-year warranty.

Product Features:
  • Fits GM 9.25″ front
  • 9.25″ ring gear
  • 30 spline pinion
  • 12 ring gear bolts
  • 4.11 ratio
See More

Yukon Gear – High Performance Ring & Pinion Gear Set For GM 9.25" IFS Reverse Rotation In A 4.56 Ratio (Part No.24499)

High Performance Ring & Pinion Gear Set For GM 9.25" IFS Reverse Rotation In A 4.56 Ratio

from

$454.99
Yukon Ring & Pinion sets give you the confidence of knowing you’re running gears designed for the harshest of conditions. Whether it’s on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance & quality. Yukon uses the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon ring & pinion sets come standard with a one-year warranty.

Product Features:
  • Fits GM 9.25″ front
  • 9.25″ ring gear
  • 30 spline pinion
  • 12 ring gear bolts
  • 4.56 ratio
See More

Yukon Gear – High Performance Ring & Pinion Gear Set For GM 9.5" In A 4.11 Ratio (Part No.24167)

High Performance Ring & Pinion Gear Set For GM 9.5" In A 4.11 Ratio

from

$454.99
Yukon Ring & Pinion sets give you the confidence of knowing you’re running gears designed for the harshest of conditions. Whether it’s on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance & quality. Yukon uses the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon ring & pinion sets come standard with a one-year warranty.

Product Features:
  • Fits GM 9.5″
  • 9.50″ ring gear diameter
  • 30 spline pinion
  • 12 ring gear bolts
  • 4.11 ratio
See More

Yukon Gear – High Performance Ring & Pinion Gear Set For GM 8.25" IFS Reverse Rotation In A 4.11 Ratio (Part No.24153)

High Performance Ring & Pinion Gear Set For GM 8.25" IFS Reverse Rotation In A 4.11 Ratio

from

$454.99
Yukon Ring & Pinion sets give you the confidence of knowing you’re running gears designed for the harshest of conditions. Whether it’s on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance & quality. Yukon uses the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon ring & pinion sets come standard with a one-year warranty. 2010 GM 8.25IFS Front ends equipped w/ factory 3.08 gear will need a new carrier when changing ratio. When purchasing 3.42 & up gears for a factory 3.08 application you must also purchase a YC G26018131 case with it. Deck Height w/ 3.08 Ratio 1.780″ Deck height w/ 3.42 & up Ratio 1.920″.

Product Features:
  • Fits 2013 and down GM 8.25″ IFS
  • 8.25″ ring gear diameter
  • 30 spline pinion
  • 10 ring gear bolts
  • 4.11 ratio
See More

Yukon Gear – High Performance Ring & Pinion Gear Set For GM 9.25" IFS Reverse Rotation In A 3.73 Ratio (Part No.24497)

High Performance Ring & Pinion Gear Set For GM 9.25" IFS Reverse Rotation In A 3.73 Ratio

from

$454.99
Yukon Ring & Pinion sets give you the confidence of knowing you’re running gears designed for the harshest of conditions. Whether it’s on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance & quality. Yukon uses the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon ring & pinion sets come standard with a one-year warranty.

Product Features:
  • Fits GM 9.25″ front
  • 9.25″ ring gear
  • 30 spline pinion
  • 12 ring gear bolts
  • 3.73 ratio
See More

Yukon Gear – High Performance Ring & Pinion Gear Set For GM 8.25" IFS Reverse Rotation In A 4.56 Ratio (Part No.24154)

High Performance Ring & Pinion Gear Set For GM 8.25" IFS Reverse Rotation In A 4.56 Ratio

from

$454.99
Yukon Ring & Pinion sets give you the confidence of knowing you’re running gears designed for the harshest of conditions. Whether it’s on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance & quality. Yukon uses the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon ring & pinion sets come standard with a one-year warranty. 2010 GM 8.25IFS Front ends equipped w/ factory 3.08 gear will need a new carrier when changing ratio. When purchasing 3.42 & up gears for a factory 3.08 application you must also purchase a YC G26018131 case with it. Deck Height w/ 3.08 Ratio 1.780″ Deck height w/ 3.42 & up Ratio 1.920″.

Product Features:
  • Fits 2013 and down GM 8.25″ IFS
  • 8.25″ ring gear diameter
  • 30 spline pinion
  • 10 ring gear bolts
  • 4.56 ratio
See More

Yukon Gear – High Performance Ring & Pinion Gear Set For GM 9.5" In A 3.73 Ratio (Part No.24166)

High Performance Ring & Pinion Gear Set For GM 9.5" In A 3.73 Ratio

from

$449.99
Yukon Ring & Pinion sets give you the confidence of knowing you’re running gears designed for the harshest of conditions. Whether it’s on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance & quality. Yukon uses the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon ring & pinion sets come standard with a one-year warranty.

Product Features:
  • Fits GM 9.5″
  • 9.50″ ring gear diameter
  • 30 spline pinion
  • 12 ring gear bolts
  • 3.73 ratio
See More

Yukon Gear – High Performance Ring & Pinion Gear Set For 10.5" GM 14 Bolt Truck In A 4.56 Ratio (Part No.24136)

High Performance Ring & Pinion Gear Set For 10.5" GM 14 Bolt Truck In A 4.56 Ratio

from

$449.99
Yukon Ring & Pinion sets give you the confidence of knowing you’re running gears designed for the harshest of conditions. Whether it’s on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance & quality. Yukon uses the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon ring & pinion sets come standard with a one-year warranty.

Product Features:
  • Fits GM 10.5″ GM 14 bolt truck
  • 10.50″ ring gear diameter
  • 30 spline pinion
  • 12 ring gear bolts
  • 4.56 ratio
See More

Yukon Gear – High Performance Ring & Pinion Gear Set For 10.5" GM 14 Bolt Truck In A 3.73 Ratio (Part No.24134)

High Performance Ring & Pinion Gear Set For 10.5" GM 14 Bolt Truck In A 3.73 Ratio

from

$449.99
Yukon Ring & Pinion sets give you the confidence of knowing you’re running gears designed for the harshest of conditions. Whether it’s on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance & quality. Yukon uses the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon ring & pinion sets come standard with a one-year warranty.

Product Features:
  • Fits GM 10.5″ GM 14 bolt truck
  • 10.50″ ring gear diameter
  • 30 spline pinion
  • 12 ring gear bolts
  • 3.73 ratio
See More

Yukon Gear – High Performance Ring & Pinion "Thick" Gear Set For 10.5" GM 14 Bolt Truck In A 4.88 Ratio (Part No.24138)

High Performance Ring & Pinion "Thick" Gear Set For 10.5" GM 14 Bolt Truck In A 4.88 Ratio

from

$449.99
Yukon Ring & Pinion sets give you the confidence of knowing you’re running gears designed for the harshest of conditions. Whether it’s on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance & quality. Yukon uses the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon ring & pinion sets come standard with a one-year warranty. This is a thick gear for a 4.10 & down carrier.

Product Features:
  • Fits GM 10.5″ GM 14 bolt truck
  • 10.50″ ring gear diameter
  • 30 spline pinion
  • 12 ring gear bolts
  • 4.88 ratio
  • Thick gear set for 4.11 and down carrier
See More

Yukon Gear – High Performance Ring & Pinion Gear Set For 10.5" GM 14 Bolt Truck In A 3.21 Ratio (Part No.24465)

High Performance Ring & Pinion Gear Set For 10.5" GM 14 Bolt Truck In A 3.21 Ratio

from

$439.99
Yukon Ring & Pinion sets give you the confidence of knowing you’re running gears designed for the harshest of conditions. Whether it’s on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance & quality. Yukon uses the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon ring & pinion sets come standard with a one-year warranty.

Product Features:
  • Fits GM 10.5″ 14 bolt truck
  • 3.21 ratio
  • 30 spline pinion
See More

USA Standard Gear – Ring/Pinion Sets (Part No.36343)

Ring/Pinion Sets

from

$439.99
Ring/Pinion Sets

Yukon Gear – High Performance Ring & Pinion Gear Set For GM 9.5" In A 3.42 Ratio (Part No.24502)

High Performance Ring & Pinion Gear Set For GM 9.5" In A 3.42 Ratio

from

$434.99
Yukon Ring & Pinion sets give you the confidence of knowing you’re running gears designed for the harshest of conditions. Whether it’s on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance & quality. Yukon uses the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon ring & pinion sets come standard with a one-year warranty.

Product Features:
  • Fits GM 9.5″
  • 9.50″ ring gear diameter
  • 30 spline pinion
  • 12 ring gear bolts
  • 3.42 ratio
See More

USA Standard Gear – Ring/Pinion Sets (Part No.36342)

Ring/Pinion Sets

from

$426.99
Ring/Pinion Sets

USA Standard Gear – Ring & Pinion "Thick" Gear Set For 10.5" GM 14 Bolt Truck In A 4.88 Ratio (Part No.36186)

Ring & Pinion "Thick" Gear Set For 10.5" GM 14 Bolt Truck In A 4.88 Ratio

from

$418.99
USA Standard ring & pinion sets are the right choice to add confidence to your install. USA Standard Gear offers a full line of ring & pinion sets for a variety of common & hard to find applications. USA standard gear offers a standard one year warranty against defects on their ring & pinion sets.

Product Features:
  • Fits GM 10.5″ GM 14 bolt truck
  • 10.50″ ring gear diameter
  • 30 spline pinion
  • 12 ring gear bolts
  • 4.88 ratio
  • Thick gear for 4.10 and down carrier
See More

FAQs for 1993 Chevrolet K2500 Differential Ring and Pinions

What are the most popular Differential Ring and Pinions for the 1993 Chevrolet K2500?

With 3 brands you can trust, our most popular Differential Ring and Pinions for the 1993 Chevrolet K2500 parts are:
Ring & Pinion Gear Set For 10.5" GM 14 Bolt Truck In A 3.73 Ratio
from $434.99
This product is not rated
Ring & Pinion Gear Set For 10.5" GM 14 Bolt Truck In A 3.73 Ratio
Differential Ring and Pinions
Ring & Pinion Gear Set For GM 9.5" In A 4.56 Ratio
from $344.99
This product is not rated
Ring & Pinion Gear Set For GM 9.5" In A 4.56 Ratio
Differential Ring and Pinions
Ring & Pinion Gear Set For GM 9.25" IFS Reverse Rotation In A 4.11 Ratio
from $329.99
This product is not rated
Ring & Pinion Gear Set For GM 9.25" IFS Reverse Rotation In A 4.11 Ratio
Differential Ring and Pinions