broken th350 bellhousing

Discussion in 'Race car chassis tech' started by Swagon, Feb 27, 2019.

  1. Swagon

    Swagon Well-Known Member

    Im pretty sure my issue is a result in a miscalculated pinion angle, and the stock driveshaft that has the rubber on the pinion end. Engine is a built 350 using stock motor mounts with a bolt through them and sealed up with 3m window weld. trans mount is a poly and actually gives more than a stock rubber from the parts store. is it the bushings that caused the issue or is it a drive line issue. don't want this to happen with the th400 I have now.
  2. BrianTrick

    BrianTrick Brian Trick

    No. What you currently have in your driveline would not break your bellhousing. Pinion angle would not do that. If the angle was too severe,it would just cause wear on your u-joints. If you had rubber engine mounts AND a solid steel transmission mount,then you would break the tail housing of the transmission. But you do not. You have a urethane mount,which still have flex to it. The engine and transmission are bolted together as one,and can still move as they should. How much power is that engine making?
  3. telriv

    telriv Well-Known Member

    Most common problem I've seen is that the bell housing bolts were loose.
  4. agetnt9

    agetnt9 Agetnt9 (Dan)

    When it was mounted to engine there may have been some thing between the block and trany . and was broke before you drove it.
  5. hugger

    hugger Well-Known Member

    That will bust one In short order for sure
  6. Premier 350

    Premier 350 Chris (aka Webby)

    I can't see mounts being the issue. A mate & I cracked one on a TH-180 years ago. Didn't have the trans lined up correctly & decided to let the bolts pull it into place.
    Not a happy ending.

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