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post #1 of (permalink) Old 03-13-2001, 06:54 AM
sas87yj
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shimmed rear axle after-effects

i read somewhere that the gears may not get lubricated properly after shimming. i just installed 12 degree shims after 4.5" lift to aim pinion at transcase. to give you an idea of 12 degrees- the shim is 4" long, 1/8" thick at rear and 1" thick in front. the diff has quite a pitch now but it aims right at the transcase. next will install the SYE and CV shaft. there must be others doing the same? anyone else running similar set-up? do i have a valid concern and what can be done? the drain plug now sets lower due to the tilt. don't see how i could fill it more than before.
thanks,steve

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post #2 of (permalink) Old 03-13-2001, 08:43 AM
 
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Re: shimmed rear axle after-effects

to fill it more: park it on a slope, nose down, until the differential is approximately level. i recommend a product called Lucas Oil Stabilizer. it makes your oil and gear lube sticky and stringy (kinda like melted cheese) so it stays on the gear and in the bearings. do some searches for more info. matt

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post #3 of (permalink) Old 03-13-2001, 09:14 AM
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Re: shimmed rear axle after-effects

One thing that i have seen done is a plumbing 90 screwed into the case then a cap on the 90. It will get more in there. Run synthetic in there. That will make up for it being low. I use royal purple gear lube in anything that takes gear oil. Good luck

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post #4 of (permalink) Old 03-13-2001, 05:45 PM
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Re: shimmed rear axle after-effects

both seem like good ideas to me. park on a slope to get more in and the 90 degree plumber fitting might not be my choice although it would allow more fluid. woud have to put a real short nipple in diff first, then a 90 with a plug. i was also wondering if anyone is running the pinion at 12 degrees and is their axle surviving. i always fill my diff till it starts to come out. it is rule of thumb that if you can stick the end of your pinkey in there and touch fluid- you are ok. with the tipped pinion, i don't believe this will apply anymore.
thanks,steve

post #5 of (permalink) Old 03-13-2001, 06:00 PM
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Re: shimmed rear axle after-effects

Simple, just block the front tires, jack up the back end until you get the approximate angle of the diff as it was stock, put some jack stands under it, fill it as you normally would, put the plug back in and lower it back down.

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post #6 of (permalink) Old 03-13-2001, 06:28 PM
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Re: shimmed rear axle after-effects

I think mine is a 6 degree shim and fill it like the others say and run synthetic. Scram

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post #7 of (permalink) Old 03-13-2001, 07:26 PM
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Re: shimmed rear axle after-effects

Mine has whatever skyjacker puts on their rear springs. I don't know what the angle is, but it does point it up some. I did the jack it up to fill it trick, but I like the elbow fitting idea. I haven't had any problem with mine.......been almost a year.


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post #8 of (permalink) Old 03-13-2001, 07:33 PM
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Re: shimmed rear axle after-effects

<font color=blue>Simple, just block the front tires, jack up the back end until you get the approximate angle of the diff as it was stock, put some jack stands under it, fill it as you normally would, put the plug back in and lower it back down.
</font color=blue>

That'd be 19.43" above where the diff is now. Just for reference.

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post #9 of (permalink) Old 03-13-2001, 09:11 PM
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Re: shimmed rear axle after-effects

you lost me on that one jeepn! i figure the fill plug spun down approx 1.5" from original position. so you are saying the rear end would have to be jacked up 19" to achieve original pinion pitch? i need to see a math diagram on this one please. i'm not doubting you but just want to see your calcs.[img]/wwwthreads_images/icons/smile.gif[/img]
thanks,steve

post #10 of (permalink) Old 03-13-2001, 09:26 PM
 
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Re: shimmed rear axle after-effects

Jeepns Math: He "made a triangle" from the ground to the front axle to the rear axle. 12deg added to what ever the angle was orginally(i don't know but i am sure he does) = one angle. the lenght between alxes a 90deg angle from the ground. 2 angles and a side is enough to find out the other side. Anyone get this?? [img]/wwwthreads_images/icons/smile.gif[/img][img]/wwwthreads_images/icons/smile.gif[/img]

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