Rear Mount Unit for the Jeep TH400 to Dana 20 Adapter
This rear mount is a superior version to the original QuadraTrac to TH400 adapter as found on 1973-1979 Jeeps. The factory original #622039 mount had a single post to the crossmember, and is notorious for premature failure. This improved mount features two studs into the crossmember (the customer will have to redrill the crossmember) and urethane, interlocked construction.
Sometimes called a "rear engine mount", these transmission and transfer case mounts are a critical part of the Jeep powertrain's support onto the crossmember or skid pan.
This popular Borg-Warner style rear mount and sub-plate (image, below) are 2"tall. It matches the bolt holes in most of our adapter housings. It is used on installations where a rear mount can be attached directly to an existing crossmember (or belly pan) or where you may need to make a custom bracket for spacing or bolt hole purposes.
Do not, in any scenario, hard mount a factory or conversion powertrain. Rigid mounting directly to a crossmember will likely cause stresses to break transmission cases, adapter housings, etc. and failure to use a proper rear mount will void the warranties offered by Novak and most other manufacturers.
This is the original, anemic mount for the TH400 to Dana 20 or Quadratrac adapter that the improved Novak design replaces.
Applications & Compatibility
Used with the factory or Novak reproduction of the #8624113 adapter as used between the TH400 and Dana 20 in the 1970's CJ and FSJ Jeep applications.
Installation of the included sub-plate which allows for the use of the popular Novak / Borg Warner rear mount, making future sourcing and replacements easy. Rear mount shown attached to adapter for illustration. Adapter not included.
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Installation Requirements
Installation of the RMU will often require a spacer or bracket be made to attach to an existing crossmember or skidplate. This is usually a quite simple procedure. Some guidelines to remember is to keep the driveline parallel to the centerline of the Jeep. That is, the crank centerline should be the same distance from the centerline of the vehicle as the rear output shaft (if the transfer case has a centered rear output, you’ll have to get more creative for this on a D18 or Quadratrac). The driveline should tip 3-7 degrees down in the rear.
