1966 Mercury S-55 Automatic Transmission Kits

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Keep Your 1966 Mercury S-55 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 Mercury S-55 looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Transmission Shift 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 Mercury S-55 Automatic Transmission Kit at Advance Auto Parts is around $135.53, with a range that starts at $59.99 and goes up to $183.99. With 4 options in stock from 2 trusted brands, finding the right fit is easy. Popular picks like AT SHIFT KIT, ManTransBrg-SealKit, and ManTransSmallPartKit start at just $59.99 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 Mercury S-55 in peak condition, inside and out.

Essential 1966 Mercury S-55 Automatic Transmission Kits

B & M – Shift Improver Kit, 67-91 C6 Transmission (Part No.40262)

Shift Improver Kit, 67-91 C6 Transmission

from

$79.99
The B&M Shift Improver kit, is the easiest way to get the performance you want out of your transmission. A few simple modifications and your transmission will shift fast, firm and live longer.

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
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ATP – AT SHIFT KIT (Part No.FK-6)

AT SHIFT KIT

from

$77.99
AT SHIFT KIT

Most Popular Transmission Shift Kit for 1966 Mercury S-55s

Enhance your 1966 Mercury S-55 with this popular Transmission Shift Kit we have in stock, for $77.99.

ATP – AT SHIFT KIT (Part No.FK-6)

AT SHIFT KIT

from

$77.99
AT SHIFT KIT

Best-Selling 1966 Mercury S-55 Transmission Rebuild Kits

Upgrade your S-55 with one of our 3 best-selling Transmission Rebuild Kits.

USA Standard Gear – ManTransBrg-SealKit (Part No.76155)

ManTransBrg-SealKit

from

$183.99
ManTransBrg-SealKit

USA Standard Gear – ManTransBrg-SealKit (Part No.74117)

ManTransBrg-SealKit

from

$176.99
ManTransBrg-SealKit

USA Standard Gear – ManTransSmallPartKit (Part No.76195)

ManTransSmallPartKit

from

$59.99
ManTransSmallPartKit

FAQs for 1966 Mercury S-55 Automatic Transmission Kits

What are the best-selling Automatic Transmission Kits for 1966 Mercury S-55s?

Out of 4 Automatic Transmission Kits that fit 1966 Mercury S-55s, the following parts are the top sellers:

What’s the price range for 1966 Mercury S-55 Automatic Transmission Kits?

The prices of Automatic Transmission Kits for the 1966 Mercury S-55 range from $59.99 up to $183.99 for the most premium parts.

What is the average price of an Automatic Transmission Kit for a 1966 Mercury S-55?

The average price for Automatic Transmission Kits for the 1966 Mercury S-55 is $135.53. 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.

What are the cheapest Automatic Transmission Kits for my 1966 Mercury S-55?

The cheapest 1966 Mercury S-55 Automatic Transmission Kits we carry are:

Does Advance Auto Parts sell Automatic Transmission Kits for any other 1966 Mercury models?

What types of Automatic Transmission Kits do you sell for my 1966 Mercury S-55?

As of 3/1/26, these are some of the most in-demand types of Automatic Transmission Kits for a 1966 Mercury S-55:

Can I get help with 1966 Mercury S-55 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 Mercury Automatic Transmission Kits and more.

What is your return policy for Mercury S-55 Automatic Transmission Kits?

Advance Auto Parts keeps returns simple. For new Mercury S-55 Automatic Transmission Kits and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.