6422-TRANS DAPT - LS/G-BODY TRANSMISSION CROSSMEMBER
Photo of LS/G-BODY TRANSMISSION CROSSMEMBER. This Product is MADE IN THE USA!

Transmission Crossmember; LS into 78-88 GM A & G-Body Cars

LS Engine Swap Transmission Crossmember; LS into 78-81 GM A-Body & 1982-88 G-Body Cars (equipped with a driver [left] side, 200R4 framerail extension)


Trans-Dapt Performance Products has been manufacturing products to assist gearheads install an LS engine into a wide variety of classic GM cars and trucks since 2001, when they released universal-use engine adapter plates. Since this early start in the LS engine swap market, Trans-Dapt has dramatically expanded its LS engine swap product line to include precise fitting, application specific engine and transmission mounting components.

This steel transmission crossmember kit has a 3-piece design, with a center segment that can be unbolted for quicker removal of the transmission. The crossmember is made in the USA, and is configured to aid in the installation of a T56, TH400, 4L60, 65, 70 or 4L80E transmission with an LS engine in 1978-81 GM A-Body, or 1982-88 GM G-Body cars that have the driver side frame rail extension for THM200-R4 transmissions. **For vehicles that DO NOT have the factory THM200R4 extensions, the use of Trans-Dapt # 6423 frame rail adapter is required (sold separately).

Unlike many of the kits on market that require you purchase separate adapters to accommodate the different transmission types, this kit includes adapters for any of the transmissions it is designed to fit. While this crossmember may work "ok" with other manufacturer's engine mounts, we recommend this crossmember be used with Trans-Dapt's LS into A/G-Body engine mounts, and Hedman Hedders' 1978-88 GM A/G-Body LS Engine Swap Headers.

Product Specifications

[PLEASE REVIEW THE FOLLOWING PRODUCT ATTRIBUTES & VEHICLE APPLICATION FOOTNOTES SPECIFIC TO YOUR VEHICLE, THOROUGHLY]

  • Transmission Compatibility TH400
  • Transmission Compatibility 4L60E
  • Transmission Compatibility 4L65E
  • Transmission Compatibility 4L70E
  • Transmission Compatibility 4L80E
  • Transmission Compatibility T-56
  • Contents Crossmember, Transmisson pad, transmission adapter brackets, mounting hardware
  • Drop Distance No Drop
  • Engine Chevy LS Series
  • Finish Temporary Black Shipping Paint. This coating is not intended To Be Final Finish.
  • Finish Type Temporary Black Shipping Paint
  • Product Type Transmission Mounts
  • Kit Type with RUBBER Pads
  • Materials 0.114 in. mild steel tubing
  • Material Rubber/Steel
  • Installation Notes Cars without 200R4 framerail extension require Trans-Dapt 6423. Sold separately!
  • Bolts/Studs Included Yes
  • Fastener(s) Included Yes
  • Installation Hardware Included Yes
  • Mounting Bracket Included Yes
  • Mounting Hardware Included Yes
  • Package Contents Crossmember, Transmisson pad, transmission adapter brackets, mounting hardware
  • Bracket Finish Black Paint
  • Bushing Color Black
  • Bushing Material Rubber
  • Transmission Mount Type Crossmember
  • Bolt On Yes
  • Dampening Type Pad
  • Mount Material Rubber
  • Mounting Type Bolt-On Design
  • Transmission Type T56, TH400, 4L60E, 4L80E
  • Welding Required No
  • Vehicle Family A-Body (GM) 1978-81
  • Vehicle Family G-Body (GM) 1982-88
  • Replacement Mount Pads 9442
  • California Proposition 65 WARNING: Cancer. For more info visit www.P65Warnings.ca.gov
  • Photo Disclaimer Actual product design, construction, or included components may vary.

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