Guys,
Ive just fitted an aftermarket T56 and spohn xmember and adjustable torque arm and HD driveshaft
Im having some difficulty in setting the torque arm, so there is no vibration but i'm not too sure what angles im suppose to be setting.
Does the angle of the engine play a part?Obviously the driveshaft and pinion angle do.
Any help would really be appreciated

thanks

pM

 

you are settting the diffrence between the pinion angle, and the output shaft angle. so the angle of the engine does matter (it will effect the output shaft angle.)

Dean posted these pictures some time ago. I think its time to rehash them.

 

2.

 

Here is what im using, I realize Dean said its better to get it from the output shaft...

http://www.go-fast.org/z28/pinionangle.html

 

Pasky, that link is wrong. The picture show the diff referenced off of the driveshaft.

The proble there is ride height diffences. Not all cars have the same ride heights, so not all driveshafts are directly parallel with the trans output shaft.

My 3 examples that John posted again show 3 diffent ride heights, thus 3 different correct settings based on each.



As for the 2-4* for race setups- if the car is Drag race ONLY (I said ONLY) then the car is run ONLY in short straight hard acceleration bursts under thrust the whole time. Why 2* or why 4*- How is this determined? It depends on how much traction,+ how much power you are putting down, + how much deflection your suspension bushings have, + (under massive HP, Were talking 1500HP- bigtime) +how much your suspension rods flex under launchand promote massive upward thrust of the diff.
This senerio would require more towards 4*. Any third gen I"ve seen that is full drag around here would never require more than about -2 1/2*. I would never go more than -1* on a car that is street driven even the least bit- You'll tearup your u-joints and get the waa-waa's (bad harmonics)

 

Still trying to set this up.Let me tell you what ive got.
The Engine/trans is 3.3 degrees with tailshaft end down.Ive set the pinion 3.3 degrees nose up.Just to confuse things,because the car is lowered,the UJ at the pinion is higher than the UJ at thegearbox tailshaft.I realise most cars are opposite to this.
The drive shaft angle is 3 degrees(slopes from pinion end DOWN to gearbox tailshaft.
Your opinions please
Thanks
PM

 

You now have them matched, so simply lower the front of the pinion down 1* more now.

It doesn't matter whether the diveshft is sloping up or sloping down as it leads back to the pinion- Just disregarde the driveshaft completely- make like it doesn't exist. The pinion relation is between the "output shaft" on the trans and the "pinion". Set them both equal (sound like where you are at), then lower the front nose of the pinion 1* more and you're finished.

 

OK Thanks alot

PM