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  1. BigBlockMopar

    what 4 speed auto transmissions can i use? 46rh etc

    The front of the transmission can't changed much ofcourse but it would be nice if the tailshaft could end up little bit higher. About 1" I recall. But that last inch will need more floormods. If one doesn't 'bash and reshape' the tunnel, the trans will be hanging lower still. The position of...
  2. BigBlockMopar

    what 4 speed auto transmissions can i use? 46rh etc

    Eventhough I'm daily driving the (lowered) Dart without any issues on speedbumps, I would've liked the transmission to be tucked up a little higher in the tunnel. The stock deeper 518-transmission pan is the lowest part under the car right now, hanging about 1/2" to 1" below the exhaust pipes...
  3. BigBlockMopar

    what 4 speed auto transmissions can i use? 46rh etc

    I installed a 518 in my '73 Dart. I removed the top of the crossmember entirely at first, and after a few weeks I fully welded the remaining part of the crossmember to the floorboards for rigidity as the spotwelds where starting to seperate. Did not cut open the floorboard but used a healthy...
  4. BigBlockMopar

    what 4 speed auto transmissions can i use? 46rh etc

    Using an A500 transmission will need the same floor and crossmember alterations as with an A518. The A500 transmission body itself may be smaller, but the flange to the OD is the same on both, and that's where the floor mods are needed. Left A518 - Mid 727 - Right A500
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