1966 Chevrolet P20 Series Automatic Transmission Kits
Keep Your 1966 Chevrolet P20 Series in Top Shape with Quality Automatic Transmission Kits
Whether you’re repairing or upgrading your Automatic Transmission Kit, using high-quality parts is key to keeping your 1966 Chevrolet P20 Series looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Transmission Shift Kits, Transmission Master Repair Kits, and Transmission Rebuild Kits. Whether you’re replacing a damaged part or enhancing your truck’s style and protection, you’ll find exactly what you need to get the job done right.
Competitive Prices and Extensive Inventory
The average price for a 1966 Chevrolet P20 Series Automatic Transmission Kit at Advance Auto Parts is around $294.76, with a range that starts at $72.99 and goes up to $499.99. With 11 options in stock from 2 trusted brands, finding the right fit is easy. Popular picks like AT OVERHAUL KIT, AT OVERHAUL KIT, and AT MSTR REP KIT PLUS start at just $76.99 and offer a great balance of form and function.
Explore Related Parts
While you’re upgrading or replacing your Automatic Transmission Kit, don’t forget to check out other key components like Torque Converter and Related Products and Transmission Cooler and Parts. At Advance Auto Parts, we’re here to help you keep your 1966 Chevrolet P20 Series in peak condition, inside and out.
Find Your Specific 1966 Chevrolet P20 Series Automatic Transmission Kits
Looking for the perfect Automatic Transmission Kit for your 1966 Chevrolet P20 Series? You’re in the right place. Below, you’ll find links to various types of Automatic Transmission Kits that fit your vehicle. At Advance Auto Parts, we offer only the highest quality OEM and aftermarket Automatic Transmission Kits, ensuring durability and a precise fit for your Chevrolet P20 Series. Whether you’re driving a 1966 model or another popular model year like
1963,
1964,
1965, and
1967, we’ve got you covered. Purchasing Automatic Transmission Kits from Advance Auto Parts is a smart choice, giving you access to trusted brands and parts built to perform. Below, you’ll find links to various types of Automatic Transmission Kits that fit your vehicle.
Essential 1966 Chevrolet P20 Series Automatic Transmission Kits
B & M – Transmission Kit, Master Overhaul Kit For TH400 (Part No.21041)
from
$449.99
These kits include all of the necessary components to rebuild your automatic transmission. OEM style gaskets included. Kits do not include overhaul instructions – please refer to factory shop manual for proper assembly procedures.
Product Features:
See More
Product Features:
- Complete High Perf. Or Racing Trans. Overhaul
- Includes Only OEM Valvebody Gaskets
- Instructions Not Included
B & M – Shift Improver Kit For 65-87 TH400 Transmission (Part No.20260)
from
$72.99
The B&M Shift Improver Kit the easiest way to get the performance you’ve always wanted out of your automatic transmission, two modes to select from: Heavy Duty, or Street/Strip. It’s our least expensive and simplest to install kit.
Product Features:
See More
Product Features:
- Provides Crisp Shifts
- On Any Stock Automatic Transmission
- Eliminates Soft/Sluggish Shift
- Eliminates Shift Overlap
- Eliminate Clutch and Band Wear
- Improves Transmission Life
- Transmission Removal Not Required
B & M – Transpak For 65-87 TH400 Transmission (Part No.20228)
from
$162.99
The B&M Transpak has all the features in the Shift Improver Kit, plus it provides additional driver manual control. Retain full automatic features and standard shift points with selector in Drive.
Product Features:
See More
Product Features:
- Recalibrate Auto. Transmission
- Optimum Performance
- Select Your App. Mode
- Improves Transmission Life
- Trans. Removal Not Required
- Downshift At Any Speed
- Great For Trailer Towing
- For Heavy Loads Driving Downhill
ATP – AT SHIFT KIT (Part No.JK-1)
from
$75.99
AT SHIFT KIT
ATP – AT MSTR REP KIT PLUS (Part No.JMS-9)
from
$368.99
AT MSTR REP KIT PLUS
ATP – AT MASTER REPAIR KIT (Part No.CM-11)
from
$245.99
AT MASTER REPAIR KIT
ATP – AT MASTER REPAIR KIT (Part No.JM-9)
from
$253.99
AT MASTER REPAIR KIT
B & M – Transkit For 65-87 TH400 Transmission (Part No.20229)
from
$499.99
A B&M transmission in a box! Transform your automatic transmission into a full-tilt B&M performer! This is our ultimate transmission kit – it comes complete with full instructions on how to assemble your transmission to B&M specifications.
Product Features:
See More
Product Features:
- High Perf. Friction Materials
- Complete Overhaul Gasket Set
- Modification Components
- Replacement Valves
- Replacement Springs
- Drain Plug Kit Included
B & M – Master Overhaul Kit For Powerglide Transmission (Part No.21040)
from
$449.99
The B&M Master Racing Overhaul Kit includes all gaskets, seals, bushings and high performance friction materials. No transbrake body gaskets or instructions included.
Product Features:
See More
Product Features:
- Complete High Perf. Or Racing Trans. Overhaul
- Includes Only OEM Valvebody Gaskets
- Instructions Not Included
ATP – AT OVERHAUL KIT (Part No.CGS-17)
from
$97.99
AT OVERHAUL KIT
ATP – AT OVERHAUL KIT (Part No.JGS-52)
from
$76.99
AT OVERHAUL KIT
Popular 1966 Chevrolet P20 Series Automatic Transmission Kits Categories
Most Popular Transmission Shift Kits for 1966 Chevrolet P20 Series
Enhance your 1966 Chevrolet P20 Series with one of the 4 Transmission Shift Kits we have in stock, starting at just $72.99.
B & M – Transmission Kit, Master Overhaul Kit For TH400 (Part No.21041)
from
$449.99
These kits include all of the necessary components to rebuild your automatic transmission. OEM style gaskets included. Kits do not include overhaul instructions – please refer to factory shop manual for proper assembly procedures.
Product Features:
See More
Product Features:
- Complete High Perf. Or Racing Trans. Overhaul
- Includes Only OEM Valvebody Gaskets
- Instructions Not Included
B & M – Transpak For 65-87 TH400 Transmission (Part No.20228)
from
$162.99
The B&M Transpak has all the features in the Shift Improver Kit, plus it provides additional driver manual control. Retain full automatic features and standard shift points with selector in Drive.
Product Features:
See More
Product Features:
- Recalibrate Auto. Transmission
- Optimum Performance
- Select Your App. Mode
- Improves Transmission Life
- Trans. Removal Not Required
- Downshift At Any Speed
- Great For Trailer Towing
- For Heavy Loads Driving Downhill
ATP – AT SHIFT KIT (Part No.JK-1)
from
$75.99
AT SHIFT KIT
B & M – Shift Improver Kit For 65-87 TH400 Transmission (Part No.20260)
from
$72.99
The B&M Shift Improver Kit the easiest way to get the performance you’ve always wanted out of your automatic transmission, two modes to select from: Heavy Duty, or Street/Strip. It’s our least expensive and simplest to install kit.
Product Features:
See More
Product Features:
- Provides Crisp Shifts
- On Any Stock Automatic Transmission
- Eliminates Soft/Sluggish Shift
- Eliminates Shift Overlap
- Eliminate Clutch and Band Wear
- Improves Transmission Life
- Transmission Removal Not Required
Best-Selling 1966 Chevrolet P20 Series Transmission Master Repair Kits
Upgrade your P20 Series with one of our 4 best-selling Transmission Master Repair Kits.
ATP – AT MSTR REP KIT PLUS (Part No.JMS-9)
from
$368.99
AT MSTR REP KIT PLUS
ATP – AT MASTER REPAIR KIT (Part No.JM-9)
from
$253.99
AT MASTER REPAIR KIT
B & M – Transkit For 65-87 TH400 Transmission (Part No.20229)
from
$499.99
A B&M transmission in a box! Transform your automatic transmission into a full-tilt B&M performer! This is our ultimate transmission kit – it comes complete with full instructions on how to assemble your transmission to B&M specifications.
Product Features:
See More
Product Features:
- High Perf. Friction Materials
- Complete Overhaul Gasket Set
- Modification Components
- Replacement Valves
- Replacement Springs
- Drain Plug Kit Included
ATP – AT MASTER REPAIR KIT (Part No.CM-11)
from
$245.99
AT MASTER REPAIR KIT
Top-Quality Transmission Rebuild Kits for 1966 Chevrolet P20 Series
Choose a high-quality OEM or aftermarket Transmission Rebuild Kit for Chevrolet P20 Series and enjoy top-notch performance from $76.99.
ATP – AT OVERHAUL KIT (Part No.CGS-17)
from
$97.99
AT OVERHAUL KIT
ATP – AT OVERHAUL KIT (Part No.JGS-52)
from
$76.99
AT OVERHAUL KIT
B & M – Master Overhaul Kit For Powerglide Transmission (Part No.21040)
from
$449.99
The B&M Master Racing Overhaul Kit includes all gaskets, seals, bushings and high performance friction materials. No transbrake body gaskets or instructions included.
Product Features:
See More
Product Features:
- Complete High Perf. Or Racing Trans. Overhaul
- Includes Only OEM Valvebody Gaskets
- Instructions Not Included
FAQs for 1966 Chevrolet P20 Series Automatic Transmission Kits
What are the best-selling Automatic Transmission Kits for 1966 Chevrolet P20 Series?
Out of 11 Automatic Transmission Kits that fit 1966 Chevrolet P20 Series, the following parts are the top sellers:
- AT OVERHAUL KIT (11238745) – $97.99
- AT OVERHAUL KIT (11238741) – $76.99
- AT MSTR REP KIT PLUS (11238803) – $368.99
What’s the price range for 1966 Chevrolet P20 Series Automatic Transmission Kits?
The prices of Automatic Transmission Kits for the 1966 Chevrolet P20 Series range from $72.99 up to $499.99 for the most premium parts.
What is the average price of an Automatic Transmission Kit for a 1966 Chevrolet P20 Series?
The average price for Automatic Transmission Kits for the 1966 Chevrolet P20 Series is $294.76. Keep in mind the variety of part types within our Automatic Transmission Kit category, where you are likely to find a wide range of prices across a variety of parts and components.
Does Advance Auto Parts sell Automatic Transmission Kits for other Chevrolet P20 Series model years?
What are the cheapest Automatic Transmission Kits for my 1966 Chevrolet P20 Series?
The cheapest 1966 Chevrolet P20 Series Automatic Transmission Kits we carry are:
- Shift Improver Kit For 65-87 TH400 Transmission (6121209) – $72.99
- AT SHIFT KIT (11239173) – $75.99
- AT OVERHAUL KIT (11238741) – $76.99
- AT OVERHAUL KIT (11238745) – $97.99
- Transpak For 65-87 TH400 Transmission (17130002) – $162.99
Does Advance Auto Parts sell Automatic Transmission Kits for any other 1966 Chevrolet models?
Yes. We stock Automatic Transmission Kits for 21 other popular 1966 Chevrolet models. Some of the most popular are 1966 Impala Automatic Transmission Kits, 1966 Malibu Automatic Transmission Kits, 1966 Corvette Automatic Transmission Kits, 1966 Caprice Automatic Transmission Kits, and 1966 El Camino Automatic Transmission Kits.
What types of Automatic Transmission Kits do you sell for my 1966 Chevrolet P20 Series?
As of 11/2/25, these are some of the most in-demand types of Automatic Transmission Kits for a 1966 Chevrolet P20 Series:
Can I get help with 1966 Chevrolet P20 Series Automatic Transmission Kit orders?
Contact our customer support team by chat or phone, through the help desk page, where you can find instant answers about Chevrolet Automatic Transmission Kits and more.
What is your return policy for Chevrolet P20 Series Automatic Transmission Kits?
Advance Auto Parts keeps returns simple. For new Chevrolet P20 Series Automatic Transmission Kits and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.