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post #1 of (permalink) Old 10-01-1999, 06:57 PM
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Rear shims

I have a 80 CJ5 Chev 350,auto(th350) w gm 3/4 t trans case. The rear driveline is at quite an angle. Has anyone used wedge shims between the axles and springs to get this angle in better alignment?

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post #2 of (permalink) Old 10-01-1999, 08:34 PM
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Re: Rear shims

CJBud, you can use shims only on your back axle, you should be able to find them at any good drive-line shop, a word of caution: do not change the angle to much for you will starve your outter pinion bearing of oil. The front axle cannot be changed with shims because it will change all the other angles, and the could spell disaster, and poor handling.
wsm

post #3 of (permalink) Old 10-01-1999, 08:52 PM
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Re: Rear shims

Thanks for the info. This is on the rear so I'll give it a try.
Thanks again.

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post #4 of (permalink) Old 10-02-1999, 10:29 AM
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Re: Rear shims

CJBud, check out Four Wheel Drive Hardware 1-800-333-5535 (www.4wd.com) they have Degree Wedges, 6 and 8 deg for under $20.00
wsm

post #5 of (permalink) Old 10-02-1999, 12:38 PM
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Re: Rear shims

[img]/wwwthreads_images/icons/tongue.gif[/img] Uh, Bud.....don't forget that the shimming of the rear axle must be done only to even out the angle between the two joints on the rear driveline. The angles must be the same...what ever down angle the t-case has...the rear axle must have the same amount of UP angle. If you want to do the constant velocity joint thing, you slap a CV joint behind the t-case and zero angle the rear end. That is what the Jeeper was thinking about when he said to be careful about oiling the pinion...he was thinking you were goint to point the rear axle pinion at the t-case with zero angle. [img]/wwwthreads_images/icons/crazy.gif[/img] [img]/wwwthreads_images/icons/crazy.gif[/img] The little moon guys could go over and help you degree the yolks but they lost their bubble protractor when they rolled at Farmington last weekend. [img]/wwwthreads_images/icons/wink.gif[/img]

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post #6 of (permalink) Old 10-02-1999, 01:37 PM
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Re: Rear shims

CJDave, If you point the rear pinion higher than original, will you really have a pinion bearing oiling problem? Won't this also change the angle (height) of the fill plug (and the oil level) on the diff to compensate. Am I nuts or is this a true statement? I'm thinking of a model 20 with the fill plug on the front of the diff.

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post #7 of (permalink) Old 10-02-1999, 02:08 PM
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Re: Rear shims

[img]/wwwthreads_images/icons/smile.gif[/img] Yep, that's true...BUT...the actual oiling is done by the forward spin of the ring gear, and the oil it flings toward the little passage actually "drains" down to the forward pinion bearing by gravity. At freeway speed, no problem. At slow speeds it can be marginal. We once had a big well repair rig that suffered endless pinion bearing failures till we complained to International Harvester. The ace truck trouble shooter came out and looked it over asking: "What's this oil you are using?" (We kept putting in heavier oil when the bearings would fail, till we were using 140 I think it was) "Uh, we thought it needed heavier oil." we replied weakly. "You dummies!" he exclaimed, "This rig only goes a mile, maybe two between wells; the oil never gets warm enough to FLING![img]/wwwthreads_images/icons/frown.gif[/img]You aren't oiling the front bearing at all!" our reply was a weak..."Oh." [img]/wwwthreads_images/icons/blush.gif[/img] We never lost another bearing when we went to LIGHTER than recommended oil.

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