Driveline angle issue?

Discussion in 'Transmission & Driveline Topics' started by ULTM8Z, Dec 1, 2019.

  1. ULTM8Z

    ULTM8Z Veteran Member

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    I'm getting this weird vibration when I punch it off the line...

    At first I thought it may be the gear vendor hitting the chassis, but I pulled it out the other day and there's actually quite a bit of clearance.

    http://nastyz28.com/threads/transmi...terchange-or-does-anyone-have-a-spare.327738/

    Seems like it would have to rip the transmission mount apart to span that distance and hit the chassis.

    I'm starting to wonder about the driveline angle. With the shortened driveshaft and all...

    It only seems to do this in first gear when I get the most axle wrap. Feels like it's coming from near the middle or back of the car...

    As of now, the engine/transmission is tilted down toward the rear by 4 deg.

    What should I be looking for in trying to diagnose this?
     
    Last edited: Dec 1, 2019
  2. ULTM8Z

    ULTM8Z Veteran Member

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  3. tom3

    tom3 Veteran Member

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    Not sure of your suspension set up but those leaf springs will wrap up quite a bit and the pinion angle changes with it. The old slapper bars used to be the fix for wheel hop and also some control for that angle change too.
     
  4. xten

    xten Veteran Member

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    Do you have the front of your leafs clamped? Any type of traction aid? If you find your pinion angle is high, you could start with shims, but that will not stop your springs from wrapping up. Ideal angle of the pinion and crank lines should be parallel. Should never intersect.
     
  5. 80sz

    80sz Veteran Member

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    Tremec has a app for drive line angle
     
  6. John Wright

    John Wright Veteran Member Lifetime Gold Member

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    Yup, I used that app when I made the crossmember for my T56 install. Worked good, no vibrations at any speed.

    Mike,
    Lakewood used to make tapered shims to adjust the pinion angle. I used them when I put Ford 9" in my S10 years ago.
     
  7. xten

    xten Veteran Member

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    Funny you should mention that. Did the same years ago. I figured out I wanted 2° and had 2"lowering blocks milled at that angle
     

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  8. ULTM8Z

    ULTM8Z Veteran Member

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    Yeah, that's what I'm wondering about... I don't recall this vibration until after I swapped out the torque converter (which now is delivering a lot more power to the rear wheels off the line).
     
  9. ULTM8Z

    ULTM8Z Veteran Member

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    Nope, everything about the springs is bone stock except for the Herb Adams mod front brackets.

    Yeah I'm hoping its something simple like adding shims...
     
  10. ULTM8Z

    ULTM8Z Veteran Member

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    Found it, thanks!!
     

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