Author Topic: Fixing my Pinion angle  (Read 2333 times)

Offline 422STROKER

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Fixing my Pinion angle
« on: May 26, 2008 - 03:41:40 PM »
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
Tom
12.77 @ 108.87 15" Street Drag radial tires 3.23 gear




Offline 422STROKER

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Re: Fixing my Pinion angle
« Reply #1 on: May 26, 2008 - 05:36:20 PM »
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 :drunk:

2 degrees enough, maybe I can shim the trans up as well?
Tom
12.77 @ 108.87 15" Street Drag radial tires 3.23 gear

Offline hemiken

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Re: Fixing my Pinion angle
« Reply #2 on: May 26, 2008 - 06:26:12 PM »
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. :2thumbs:
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Offline 422STROKER

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Re: Fixing my Pinion angle
« Reply #3 on: May 26, 2008 - 06:34:56 PM »
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
Tom
12.77 @ 108.87 15" Street Drag radial tires 3.23 gear

nivvy

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Re: Fixing my Pinion angle
« Reply #4 on: May 26, 2008 - 09:58:20 PM »
I am running 4* nose down.......

Offline Chryco Psycho

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Re: Fixing my Pinion angle
« Reply #5 on: May 26, 2008 - 10:09:07 PM »
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

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Offline 422STROKER

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Re: Fixing my Pinion angle
« Reply #6 on: May 26, 2008 - 10:12:54 PM »
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
Tom
12.77 @ 108.87 15" Street Drag radial tires 3.23 gear

Offline 422STROKER

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Re: Fixing my Pinion angle
« Reply #7 on: May 26, 2008 - 10:13:54 PM »
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
Tom
12.77 @ 108.87 15" Street Drag radial tires 3.23 gear

Offline Chryco Psycho

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Re: Fixing my Pinion angle
« Reply #8 on: May 26, 2008 - 11:51:12 PM »
try a 3* shim first , it should be enough

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Offline 422STROKER

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Re: Fixing my Pinion angle
« Reply #9 on: May 27, 2008 - 12:02:35 AM »
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 :working:
Tom
12.77 @ 108.87 15" Street Drag radial tires 3.23 gear

Offline Chryco Psycho

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Re: Fixing my Pinion angle
« Reply #10 on: May 27, 2008 - 12:21:54 AM »
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 ?

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Offline 422STROKER

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Re: Fixing my Pinion angle
« Reply #11 on: May 27, 2008 - 12:46:44 AM »
It is straight in line with the driveshaft both angling up towards the trans at a 2 degree angle. 

Tom :1zhelp:
Tom
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Offline Chryco Psycho

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Re: Fixing my Pinion angle
« Reply #12 on: May 27, 2008 - 01:29:31 AM »
so you need to drop approx 6* to get where you want to be , try a 4* shim ti should be close

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Offline 422STROKER

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Re: Fixing my Pinion angle
« Reply #13 on: May 27, 2008 - 02:37:41 PM »
Thanks I ordered them from summit along with new centering pins.  I got new U-joints as well.

Tom :burnout:
Tom
12.77 @ 108.87 15" Street Drag radial tires 3.23 gear

nivvy

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Re: Fixing my Pinion angle
« Reply #14 on: May 27, 2008 - 06:36:13 PM »
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............  :hyper:

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
__________________________________
                                      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............  :working: