Diff fluid change.. Time to sound stupid
06-10-2012, 06:44 PM
#1
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Year: 1991
Model: Cherokee
Engine: 4.0L H.O Power Tech
I've never done this before and would like to know if it's as simple as it seems, what gear lube you use, can I just clean my cover and paint it?
Just take the cover off, let it drain, spray it with some brake parts cleaner, seal it back up, and add fluid? Seems simple, which is why I know I'm wrong
Just take the cover off, let it drain, spray it with some brake parts cleaner, seal it back up, and add fluid? Seems simple, which is why I know I'm wrong
06-10-2012, 06:53 PM
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Year: 1987
Engine: Check
Its that simple. Just make sure you don't over tighten the bolts, and make sure both the diff cover and mounting surface are uber clean before sealing with a paper gasket and thin film of red RTV on both sides.
As for reconditioning the cover itself, a wire wheel does WONDERS!! Then primer, paint, and clear if thats the route you want to go.
As for gear oil, 75-90 is good, but make sure you don't have a limited slip diff, otherwise you'll want something with the friction modifier.
As for reconditioning the cover itself, a wire wheel does WONDERS!! Then primer, paint, and clear if thats the route you want to go.
As for gear oil, 75-90 is good, but make sure you don't have a limited slip diff, otherwise you'll want something with the friction modifier.
06-10-2012, 07:13 PM
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Year: 1991
Model: Cherokee
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Originally Posted by Gee oh Dee
Its that simple. Just make sure you don't over tighten the bolts, and make sure both the diff cover and mounting surface are uber clean before sealing with a paper gasket and thin film of red RTV on both sides.
As for reconditioning the cover itself, a wire wheel does WONDERS!! Then primer, paint, and clear if thats the route you want to go.
As for gear oil, 75-90 is good, but make sure you don't have a limited slip diff, otherwise you'll want something with the friction modifier.
As for reconditioning the cover itself, a wire wheel does WONDERS!! Then primer, paint, and clear if thats the route you want to go.
As for gear oil, 75-90 is good, but make sure you don't have a limited slip diff, otherwise you'll want something with the friction modifier.
06-10-2012, 07:15 PM
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Year: 1987
Engine: Check
The bottle will say if its limited slip friendly, or that it has a friction modifier.
Wire wheel would work on the mating surfaces. Just make sure you clean up all the dust.
And RTV will help compensate for minor imperfections in the gasket or mating surface.
Wire wheel would work on the mating surfaces. Just make sure you clean up all the dust.
And RTV will help compensate for minor imperfections in the gasket or mating surface.
06-10-2012, 07:19 PM
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Year: 1991
Model: Cherokee
Engine: 4.0L H.O Power Tech
Originally Posted by Gee oh Dee
The bottle will say if its limited slip friendly, or that it has a friction modifier.
Wire wheel would work on the mating surfaces. Just make sure you clean up all the dust.
And RTV will help compensate for minor imperfections in the gasket or mating surface.
Wire wheel would work on the mating surfaces. Just make sure you clean up all the dust.
And RTV will help compensate for minor imperfections in the gasket or mating surface.
Sorry for playing 20 questions, but would hate to get it wrong.
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06-10-2012, 08:27 PM
#10
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i've never used a gasket. just sayin...
and i like ultra black rtv.
let the rtv sit on the cover for a bit, then install.
then let that sit for a bit before you fill it with gear oil.
and i like ultra black rtv.
let the rtv sit on the cover for a bit, then install.
then let that sit for a bit before you fill it with gear oil.
06-10-2012, 08:35 PM
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Year: 1991
Model: Cherokee
Engine: 4.0L H.O Power Tech
Originally Posted by caged
i've never used a gasket. just sayin...
and i like ultra black rtv.
let the rtv sit on the cover for a bit, then install.
then let that sit for a bit before you fill it with gear oil.
and i like ultra black rtv.
let the rtv sit on the cover for a bit, then install.
then let that sit for a bit before you fill it with gear oil.
06-10-2012, 09:55 PM
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Year: 1998
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IIRC, black has a higher temperature rating, and possibly higher chemical resistance.
If you have a limited slip, Pennzoil Synchromesh is recommended for the LSD clutches.
If you have a limited slip, Pennzoil Synchromesh is recommended for the LSD clutches.
06-10-2012, 09:58 PM
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Year: 1991
Model: Cherokee
Engine: 4.0L H.O Power Tech
Originally Posted by macgyver35
IIRC, black has a higher temperature rating, and possibly higher chemical resistance.
If you have a limited slip, Pennzoil Synchromesh is recommended for the LSD clutches.
If you have a limited slip, Pennzoil Synchromesh is recommended for the LSD clutches.
06-11-2012, 12:59 AM
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You can probably tell from the numbers on the diff, but the quick and dirty way is to lift both rear wheels off the ground, pop the trans into neutral and give one rear wheel a spin. If the other rear tire turns in the same direction- you have limited slip. If it turns in the opposite direction- you don't.