Changing rear differential fluid

[BorincanoKJ]

Hi everyone

It been a few month that i don't login. I been busy in recents days.

I been changing the rear differential fluid of my KJ and i want to know whether it is right or not use brake cleaning inside the differential.

Thanks in advance.

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[TwoBobsKJ]

See my answer to your question in the other thread.

Bob

 

[LibertyTC]

The answer /thread TwoBobs KJ is referring to is post #6838
http://www.jeepkj.com/forum/f196/what-did-you-do-your-jeep-today-50782/index684.html#post658088
By the looks of the two photos BorincanoKJ posted, that diff is already clean as a whistle!

 

[BorincanoKJ]

I was working changing the fluid of the rear differential, i couldn't wait any longer for answer if whether it is right or not use break cleaning. I just apply the rtv and put it back the differential cover. I wait until the next day for the rtv to dry before add gear oil.

Thank anyway Bob. Reading LibertyTC reply my doubt I had was answered. I didn't need to use the break cleaning.

 

[vaksanov]

When I did mine I sprayed it and let it dry while I was getting old rtv off and wiped everything as well, especially near the magnet to get the gunk out.
Also does anyone know if those scratches are normal wear and tear?

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[ltd02]

Also does anyone know if those scratches are normal wear and tear?

I think those scratches are just from milling the cast unit to clean it up etc. Just a guess but doesn't look bad to me.

 

[TwoBobsKJ]

Almost looks like the pinion gear hit the differential case at one point in its life. Weird...

Bob

 

[ltd02]

Almost looks like the pinion gear hit the differential case at one point in its life. Weird...

Bob

I see what you mean. I wish I had taken a closer look at mine last time I changed my gear oil.

 

[vaksanov]

Almost looks like the pinion gear hit the differential case at one point in its life. Weird...

Bob

that's what i thought when i saw it, with it scraped like that, wonder what happened :emotions34:

 

[RenKJ]

I was working changing the fluid of the rear differential, i couldn't wait any longer for answer if whether it is right or not use break cleaning. I just apply the rtv and put it back the differential cover. I wait until the next day for the rtv to dry before add gear oil.

Thank anyway Bob. Reading LibertyTC reply my doubt I had was answered. I didn't need to use the break cleaning.

When i popped my rear open im pretty sure it had never been serviced, the gear lube still looked good, but the brake cleaner took tons of gunk off the gears

 

[jp7794]

I had an International Harvester Scout years ago where you had to clean and change the differential every few thousand miles or it would start bucking real bad. Started cleaning it with gasoline and still do the same thing on my Jeep. A lot cheaper than break fluid! Obviously more flammable as well so be careful.

 

[LibertyFever]

Myself I wouldn't risk brake cleaner inside the diff.
Couldn't it get into the carrier's bearings?

What I've learned over the years is that if diff fluid can leak out of the axle then water can leak into it contaminating the fluid. Also if enough fluid leaks out the pinion bearing can burn up.

I routinely inspect my diff fluids and if its contaminated I'll change it.


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[BorincanoKJ]

Rear diff before and after.

Here i am sending some pic. before and after. Getting ready to take off the rear differential cover and the final result. I paint the differential cover dark charcoal gray and the bolts gold yellow. Filling with new fluid the differential. I hope you like my handsfree method, it"s not that bad right.

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