Fixing my Pinion angle

[422STROKER]

What shims do i need to correct my pinion angle?  Assuming what I got is no good due to some rolling vibrations at 45-55mph.

trans=4down
driveshaft at trans2down
driveshaft at pinion 2down
pinion=2up

Tom

[422STROKER]

So basically I have no angle between the driveshaft and carrier.

I'm looking to get a shim and have the carrier be down in relation to the driveshaft?

Tom

2 degrees enough, maybe I can shim the trans up as well?

[hemiken]

Hey Tom,

If the trans is 4 degrees down then the diff angle should be 4 degrees up......... But 3 degrees up would be good aswell to compensate for your hard launching.

[422STROKER]

Thanks hemiken, If I'm thinking correctly I should be able to add a 2 degree shim at the rear and 2 degrees of shim at the front?  Making the front 2 degrees down should raise my DS angle in relation to the pinion, that along with some spring shims should get me where I need.  I think.LOL

Tom

[nivvy]

I am running 4* nose down.......

[Chryco Psycho]

generally you need to get into the 6* difference between the pinion & driveshaft but if the difference is  6* you will only need a 3-4* shim as the angle of the driveshaft changes with the dif angle

[422STROKER]

I am running 4* nose down.......

Did you need shims?  And if so did you need new centering pins?

I need to order this stuff to get it done.

Tom

[422STROKER]

generally you need to get into the 6* difference between the pinion & driveshaft but if the difference is  6* you will only need a 3-4* shim as the angle of the driveshaft changes with the dif angle

Should I just get a 4 degree shim and get it over with?  Instead of doing front and rear?

Tom

[Chryco Psycho]

try a 3* shim first , it should be enough

[422STROKER]

Thanks, I can only seem to find 1,2,4 and 2.5's in a 2.5" shim.  I'd rather not stack them.  maybe the 2.5 degree ones? 

Thanks for the help, I hope to get this sorted this week.

Tom

[Chryco Psycho]

I need a clearer picture of where you are at now , is the nose of the diff lower to the grond than the driveshaft anlge or i sit sitting higher than straight in line with the driveshaft ?

[422STROKER]

It is straight in line with the driveshaft both angling up towards the trans at a 2 degree angle. 

Tom

[Chryco Psycho]

so you need to drop approx 6* to get where you want to be , try a 4* shim ti should be close

[422STROKER]

Thanks I ordered them from summit along with new centering pins.  I got new U-joints as well.

Tom

[nivvy]

I did it the way mopar muscle said to do it and was done with it..... ways to setpinion angle causes alot of grief among racers... go to moparts and in the subject box type " Best Way To Set My Pinion Angle"  and look out............ 

set you car on its suspension put an angle finder on the drivesft and the angle finder on the pinion snubber pad....

driveshaft angle is:            2* down
angle on snubber pad is :    2* up
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                                      0* angle and would need a 4-7* shims to get a 4-7* positve pinion angle (nose down)

I just had an aluminum lowering block cut at a machine shop at the angle I wanted............