Anyone know how to measure it? I think I jacked it up when I made my T-56 crossmember

 

U need a small angle finder. Set it on top of the rear end's center chunk where the torque arm bolts to. Set it to - 2 degrees for best launching. All you need to know is how to turn a wrench to adjust the torque arm to achieve the negative 2 degrees.

However, I strongly recommend having an adjustable torque arm and a drive-on lift before you attempt this!

 

See my reply elsewhere.

C

 

I've got the lift, sort of. don't have the adj. torque arm. thats why I don't think its off, but I want to check everything.

 

Would pinion angle cause a vibration?

 

yes it will because the u-joints will be turning at different speeds....a ticking time bomb..........

 

ok, so then will a -3* pinion angle cause a vibration?

 

Possibly due to the angle of the u-joints during rotation (but highly unlikely). You can "safely" according to random-tech go upto - 4* without problems.

You vibration is most likely a bad driveshaft and or u-joint.


The stock tq arm makes the pinion angle 0* (I think).

You wont notice any better sixty ft with an adjustable tq arm until you change pinion angle to -2* (where most aftermarket adj. tq arm mfg's recommend).

Hope that helps.

 

nope

 

didn't think it would. I think I traced it to a jounce bumper on the top of the T-56 that was smashed against the trans tunnel. haven't taken it out on the road yet to see.

 

Hope you don't mind my jumping in here with a question (if you do, just tell me to buzz off)....

I've tried adjusting my Ford 9" the following way: I put the angle finder on the tranny yoke to the driveshaft, recorded one angle, then moved to the diffy yoke and read the angle again. The I adjusted my BMR torque arm until it was pointing downward one to two degrees less reading than the tranny yoke did. That way the diff was pointing downward 1 to 2 degrees more than the tranny yoke.

If the way I explained it makes sense, does this sound like a legit way to set this -1 to -2 degree pinion angle?

 

that's one way you can do it. the way I did it was place it on the pinion yoke and the harmonic balancer.

 

Oooooooohhhh, I LIKE that idea!!!!!



THANKS!!!