PADO201: Dodge/Chrysler/DeSoto/Mopar Gen. 1 Hemi V8 (1954-58) to Dodge Ram 8HP70/75/80/90 Automatic Transmission Adapter Kit

Dodge/Chrysler/DeSoto/Mopar Gen. 1 Hemi V8 (1954-58) to Dodge Ram 8HP70/75/80/90 Automatic Transmission Adapter Kit

KIT OVERVIEW

The ZF 8HP series transmissions are among the best options available for transmission swaps today. Pairing one of these with an old classic Chrysler New Yorker, Imperial or any other hot rod build — whether for street or track use — can completely transform performance and drivability.

This adapter system allows you to mate a Gen1 Hemi V8 engine to a Ram V8–platform ZF 8HP transmission, including the 8HP70, 8HP75, 8HP90, and 8HP95 models. These transmissions deliver lightning-fast shifts and are capable of handling substantial power levels, especially when combined with aftermarket transmission control systems.

Technical Overview

• Compatible Engines: 1954-58 Chrysler "FirePower" 331/354/392, DeSoto "FireDome" 276/341/345, Dodge "Red Ram" 241/270/315/325. ***The earlier 1951-53 Chrysler 331 engine is NOT compatible as it has an extended bellhousing face on the rear of the engine***
  
• Compatible Transmissions: ZF 8HP70 / 8HP75 / 8HP90 / 8HP95 (Dodge/Chrysler V8 applications)
  
• Adapter Plate Material: CNC-machined 6061-T6 billet aluminum for strength and dimensional accuracy
  
• Crankshaft Interface: Includes precision-machined steel flexplate adapter and pilot converter adapter to ensure proper converter engagement and crankshaft alignment
  
• Torque Capacity: Supports power levels exceeding 1000+ HP when used with upgraded 8HP internals and aftermarket control systems
  
• Transmission Control: Compatible with popular standalone controllers such as HTG Tuning GCU, Turbo Lamik, and Sound German Automotive (SGA) systems & More
  
• Starter Compatibility: GM High Torque Mini Starter Bolted into the Adapter plate in factory location area
  
• Input Shaft Alignment: Engineered concentricity within ±0.002” to maintain clutch pack and input shaft longevity

Performance Benefits

• Ultra-fast shifts (as low as 200 milliseconds) with adaptive shift logic
• Reduced parasitic loss compared to traditional automatics
• Eight optimized gear ratios for both drag and road course performance
• Enhanced fuel efficiency at cruising speeds
• Future-proof control options, supporting paddle shifters and sequential operation modes

Applications

Ideal for street performance builds, pro-touring projects, modern resto-mods, and drag or track vehicles where maximum acceleration, shift precision, and reliability are desired.

KIT Includes:

Adapter Plate
Crank Spacer
Flexplate (Neutral Balance)
Lower Inspection Cover
Starter
Hardware

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