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AMC 4.2L to GM Transmission Adapter

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Weight:
8.00 LBS
$511.00

#SAVETHEFULLSIZEJEEP

A Portion Of The Proceeds From Your Purchase Supports The Development & Reproduction Of High Quality 1963-1991 Restoration Parts.

AMC 4.2L to GM Transmission Adapter

AMC 4.2L to GM Transmission Adapter

$511.00

Upgrade your Full Size Jeep with this precision-engineered GM automatic transmission adapter kit, designed for seamless swaps with AMC 4.2L 6-cylinder engines. This kit enables you to run a wide range of GM automatics—including TH350, TH400, TH700R4, early 4L60E, and 4L80E transmissions (with proper torque converter and controller)—while retaining reliability and stock fitment.

The kit features a robust, 0.5-inch laser-cut, Blanchard-ground steel adapter plate, CNC-machined with CMM-mapped dowel locators for exact alignment. The included 164-tooth modified flexplate is built for lasting performance and is compatible with both Chevy and Buick/Olds/Pontiac (B/O/P) style engine flanges.

Transmission Compatibility Notes:

  • 4L80E: Fully compatible when using a modified factory 4L80E torque converter with the TH350 bolt pattern, plus a standalone transmission controller.
  • Early 4L60E/4L80E: Require a separate, standalone transmission control unit.
  • Late 4L60E/4L80E (removable bellhousing/hex rear pattern): Not compatible with this kit.
  • TH350: The only suitable choice for 1972–1983 CJ5 Jeeps due to length; avoid excessive lifts for proper driveline angles.
  • 6L80E: Not compatible.
  • TH400: Must use the smaller 9-3/8” torque converter bolt pattern (for TH350, TH400, 700R4); not compatible with the larger 10” pattern.
  • AMC Starters: Works with AMC starters; some applications require a different starter—see instructions for specifics.
  • Pre-1971 AMC engines: Please contact us before ordering to confirm correct crankshaft spacer requirements.

Kit Contents:

  • Zinc-plated adapter
  • Flexplate
  • Flexplate reinforcement ring
  • Flexplate spacers
  • Dowel locators
  • Crank spacer
  • Shield plate with access port for torque converter bolts
  • Hardware
  • Detailed installation instructions

Fits:

  • All FSJs with 4.2L Engine

To submit a return or exchange request, please go to our Contact Us page to submit order information. Photos of any damaged products may be requested and required to process any full or partial refund. If approved, we will provide you with an RMA number along with a return label for shipping.

Parts returned that are not defective, are subject to a 25% restocking charge. JeepRecyclers.com/McDaniel Motor Co. is NOT responsible for any parts that have been altered, modified, disassembled, or damaged by misuse or an accident subsequent to the parts purchase.

Reconditioned parts come with a minimum warranty of 90 days, unless otherwise stated (Refer to product listing for warranty duration). The warranty is void if the parts are not returned in the same condition in which they are sold. Warranties for aftermarket parts are covered by the manufacturer.

What Are My Shipping Fees?

For orders delivered within the continental US where reason for return isn't a result of a JeepRecyclers.com/McDaniel Motor Co. error, the cost of the initial shipping charge and a return fee will be deducted from your refund. A prepaid shipping label(s) will be provided. The flat fee for each item being returned can be found in the chart below:

Retail cost of the item Per Item Return Fee
Less than $25.00 $3.75
From $25.00-$49.99 $5.75
From $50.00-$99.99 $7.75
More than $100.00 $9.75

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