NEW. This is an adapter kit and a 2 bolt gear reduction starter for Cadillac 331, 365 and 390 Engines to convert from the classic HydraMatic or Jetaway to a THM 400 transmission. A new starter is required with the installation of this kit, your original starter will not work with this application. Please watch the installation video in the "How to Install" tab to see how this product is used. Installation instructions are also included with this kit.
THIS KIT INCLUDES:
CNC Machines Aluminum Adapter Plate
Steel Flexplate with New Ring Gear
Aluminum Crankshaft Spacer
Grade 8 Crankshaft Attachment Bolts
Alloy Engine-to-Adapter Fasteners
1955-1964 Cadillac Models WITH 331, 365 OR 390 Engines ONLY**
**PLEASE NOTE: 1964 Cadillac models used 1/2 Inch (0.5 Inch) dowels on the block
These kits are designed to convert vehicles with original 331, 365 and 390 engines to THM 400 transmissions. In many instances, these kits will bolt on directly to the original parts but some may need some minor modifications. Professional installation is recommended for proper use of these parts. You are responsible to ensure parts are installed correctly to prevent unnecessary damage or wear to your parts.
Changing the transmission will require changing the mount and driveline. Please see additional products that we offer in the related products below if you would like to use these. Please compare all measurements and information before purchasing to ensure proper fit.