01Blk*SS*

iTrader: (4)

I recently installed a Midwest Chassis Fab 9 rear end with Pst driveshaft. I also installed a new torque arm/ transmission bracket. I had to shim the bracket with washers to lower the transmission. Sorry for rambling but just want to state all the mods I did. Here are the pictures from the passenger side.
The digital angle finder I used was zeroed incorrectly but I dont think it matters because we are just referencing between the two measure angle correct?

View from passenger side


Pinion angle = 111.7


Driveshaft angle = 110.6


Torque Arm angle = 111.3


thanks in advance for ANY input!

01Blk*SS*

iTrader: (4)

bump
I really hope/think my angle is good.

SoxXpupPeT

iTrader: (34)

Aim for around 3* you have alittle more to go. if you want a walk through go to www.bmrfabrication.com they have a video

subhumanzz

iTrader: (46)

just put the angle finder on the flat part of the pinion yoke. make it read whatever degree you desire, lock it down. there you have it your pinion angle is now set.

FirstYrLS1Z

iTrader: (4)

I see 1.1 degrees which is about factory setting for an OEM car. Drag racing is preffered to have at least 2 degrees which straightens out when axle wrap occurs at WOT.

01Blk*SS*

iTrader: (4)

pinion angle - driveshaft yields: 111.7 - 110.6 = 1.1*

This is my daily driver so 2* is probably not best for my style driving. So am I good to go ?
thanks for all input!

Supers

Do You have a vibration under load ?

01Blk*SS*

iTrader: (4)

I still have two break in periods to go until its ready to put it under some load. Ill report back. Just wondering why you ask?

Supers

If you don't have any vibrations during hard load or excel then it's not moving past 0.

The 2 degree rule is for most race car set ups being as some suspensions with bushing style links can see enough flex that when the car is loaded it'll move the joints angle to 0.0 having the least amount of hp loss...
Some suspensions (usually race only) can have 1.0 or even .5 depending how much movement the suspension can hold from moving.

You may need another .5 added in, if you have any vibration or even a flutter feeling under load, add in another .5 to the pinion downward.

01Blk*SS*

iTrader: (4)

makes total sense, thanks for the info. When I get home on monday I want to check it out and see whether the pinion is up or down. That angle finder is a little tricky as you can tare it.

Supers

I think your using it upside down

01Blk*SS*

iTrader: (4)

It doesnt matter if Im using it upside down, the number that matters is the difference between the pinion and driveshaft angle.

01Blk*SS*

iTrader: (4)

got it! I adjusted the pinion so it is now ~1.6 degress down compared to the driveshafte angle. A LOT less vibration, although I think it can still be dialed in a bit.
Final measurements were:
pinion= -1.4
driveshaft= +0.2
-1.4 - 0.2 = -1.6 degress

Supers

I couldn't tell you, without having the car here...

silverbullittSS

iTrader: (1)

My pinion angle is at .5 with my new moser 12bolt. I have a slight vibration on accel and decel. I also have a steel driveshaft that has been balanced. Do you think the pinion angle is causing this or is it the steel driveshaft?

01Blk*SS*

iTrader: (4)

Measure your pinion angle, then your driveshaft angle. Minus the driveshaft angle from the pinion angle. The result should be between -1.6 to -2.0 degrees. This is my opinion from reading and peoples comments. I hope that helps.