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Old August 2nd, 2011, 07:33 PM   #1
dakotaguy1
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Default Front pinion angle

I need to know what degree shims are normally on a 6" front leaf spring for a 83 dodge ram. thanks
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Old September 2nd, 2011, 03:06 PM   #2
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that all depends on your pinion angle and your caster angle. If you mesure those. you can determin what shim you need. There is no normal shim. every truck is a little bit different as far as pinion angle, and alignment mesurements.. I have never seen or heard of more than 1 truck ever have the same mesurement.
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Old November 20th, 2011, 07:03 PM   #3
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your gonna want to set your caster to -6. and your pinion angel is gonna be what it is. if you have issues your best option would be to spin the knuckles.
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Old November 23rd, 2011, 05:09 PM   #4
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I'm in the middle of swapping over to 60s on my 78 Ramcharger. I want to kill the vibrations I had with the 44F and 9 1/4 rr. I have a BDS 5" lift.


Does spinning the knuckles create any problems for anything else?

Would that be the same idea as spinning the perches on the rear?

Would it be better to run without shims?


Thanks

Last edited by Ollywood; January 9th, 2012 at 06:24 PM.
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Old November 23rd, 2011, 05:20 PM   #5
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If it was me I would set my caster angle with shims and if I still ended up with vibrations I would then grind the welds of the knuckles, spin and reweld to change my pinion angle. Just my .02...
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Old November 23rd, 2011, 05:34 PM   #6
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Just dont wanna end up having to get 2 front driveshafts made thats all
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Old November 23rd, 2011, 05:43 PM   #7
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Quote:
Originally Posted by Ollywood View Post
Just dont wanna end up having to get 2 front driveshafts made thats all
Rotating the pinion angle a few degrees doesn't seem like it would change your drive shaft length enough to make it no longer work.
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Old November 29th, 2011, 02:28 PM   #8
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Quote:
Originally Posted by chadcooper55 View Post
Rotating the pinion angle a few degrees doesn't seem like it would change your drive shaft length enough to make it no longer work.
I hope not. Would you bother keeping the shims if you spin the knuckles?

Last edited by Ollywood; November 29th, 2011 at 02:35 PM.
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Old December 5th, 2011, 08:53 AM   #9
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Quote:
Originally Posted by Ollywood View Post
Would it be better to run without shims?


Thanks

Absolutely. They should not be used on a front axle that was not designed that way from the factory.

If your caster is fine, drill out the plug welds on the diff housing at the tubes, rotate the pinion up, and re-weld.
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Old December 5th, 2011, 01:58 PM   #10
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Your referring drilling out the plugs on the front axle?
I like your theory on shims. You suggest getting rid of the shims on the rear axle as well?
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Old December 5th, 2011, 02:17 PM   #11
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It isn't a theory. It is sense, in addition to Michigan State Law. Installing shims in a front suspension that did not come with them is a procedure initially concieved as a band-aid by the OEMs so that they could address issues with vehicles which they were responsible for, yet did not want to pay for due to cost. If you think about it, aside from owner modifications there is no reason for a vehicle to not have factory-spec caster unless it has been damaged or somehow assembled in error (weld fixture f'd up, parts bent due to operator error/drunk forklift driver, etc). The latter would be something claimable against warranty. If you were the OEM, would you want to replace an entire vehicle frame or axle assembly if a $5 shim could give the customer satisfaction? This is how the unsafe practice of creating a clamped assembly stack in a steering axle which can do nothing but slowly wear away material over time and loosen was born and became popular. Putting a shim in there really isn't different than a lift block. They are just differing levels of severity.

Rear shims are less of an issue due to the different nature of the forces and power acting on them, but the ideal arrangement would be to rotate the perches.
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Old December 5th, 2011, 02:23 PM   #12
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Thanks PavementPounder for the info.
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