Changing rear diff fluid

slikjr · **Posted:** Fri Feb 09, 2007 8:20 pm

Hey y'all... I need some help. I want to change the rear diff fluid in my KJ and was wondering where the "fill" hole is? I did some searching just lying underneath but am not sure if I found it or not. I felt a small bolt head right on top of the diff beside an electrical cord/connector. I couldn't get see so I'm not sure what it is.

Anyways, where is the fill hole?

Also, what kind of oil do they recommend? Anyone tried synthetic? What comes from factory?

If you can help me out, please get back to me. Thanks a lot!!

Good wheelin'

JJsTJ · **Posted:** Fri Feb 09, 2007 8:36 pm

There should be a rubber plug on the diff cover. Pop that out and that is where you fill it back up.

kj@best · **Posted:** Fri Feb 09, 2007 8:39 pm

there is a circular thing middle of Diff, it is rubber, yank it out and there you go. It is best though to unbolt the cover, and clean out the magnet and the diff and get the excess rtv off. And you should get some RTV to or a gasket and then replace the cover

kj@best · **Posted:** Fri Feb 09, 2007 8:40 pm

140 weight synthetic.......Like Royal Purble, or Amsoil

LiLredLibby · **Posted:** Fri Feb 09, 2007 8:41 pm

Hey slikjr,to answer the question on the fill hole,it's on the cover.There will be a rubber plug about midway up.You probably need to check your manual on a specific weight of fliud.As far as brands,everyone on here seems to love the "Amsoil"brand.I think a fellow member of the board "JJsKJ" sells this product and can help with all of your lubrication needs.Good luck. :wink:

Ron

Man I must be a slow typer.

sleeve84028 · **Posted:** Fri Feb 09, 2007 9:51 pm

Did anyone mention the rubber plug yet?

gone_jeepin · **Posted:** Fri Feb 09, 2007 10:24 pm

sleeve84028 wrote:

Did anyone mention the rubber plug yet?

U mean the one in the middle of the diff??? :lol:

Jeepjeepster · **Posted:** Fri Feb 09, 2007 10:48 pm

Theres is a rubber plug on the back of the Diff.. Pull it out..

:lol:

slikjr · **Posted:** Sat Feb 10, 2007 2:09 am

EXCELLENT! Thanks for all the help everyone. Yeah, I know the plug you are all talking about. And I'll pick up some Amsoil I think.

Do you fill it up just to that hole then? It's half way up, so you fill it to there or...?

JJsTJ · **Posted:** Sat Feb 10, 2007 8:10 am

Quote:

And I'll pick up some Amsoil I think.

PLMK if you need any help with that. :wink:

When you refill it the level will be about an index fingers first knuckle length below that hole. Stick your finger in, bend it down at the first knuckle and the tip of your finger should touch the gear lube or close to it.

My Jeeps work out that way w/ the factory cover and filling on a level surface. W/out factory posi they take a little over 2 qts and with posi take 2 qts. + the additive which I dump in after the first Qt. My wifes KJ w/ Powertrax takes 2 qts.

N / A · **Posted:** Sat Feb 10, 2007 9:03 am

have fun jamming 140 in there, I just did it and that stuff is thick

BVCRD · **Posted:** Sat Feb 10, 2007 12:22 pm

N / A wrote:

have fun jamming 140 in there, I just did it and that stuff is thick

Isn't it supposed to be 75W140? Full synthetic like what came from the factory? I used a bottle pump and it flowed fine.

JJsTJ · **Posted:** Sat Feb 10, 2007 12:57 pm

BVCRD wrote:

N / A wrote:

have fun jamming 140 in there, I just did it and that stuff is thick

Isn't it supposed to be 75W140? Full synthetic like what came from the factory? I used a bottle pump and it flowed fine.

Yes, you really should use a synthetic lube in the diffs. The 140 weight can flow kinda slow if it is cold out so I am guessing that might have something to do with N/A's comment. (?) After all, he is in Canada and isn't it Always cold there? Maybe he left the lube outside of his igloo next to his dog sled and it froze? :wink:

J/K man!!

BVCRD · **Posted:** Sat Feb 10, 2007 1:02 pm

JJsKJ wrote:

BVCRD wrote:

N / A wrote:

have fun jamming 140 in there, I just did it and that stuff is thick

Isn't it supposed to be 75W140? Full synthetic like what came from the factory? I used a bottle pump and it flowed fine.

Yes, you really should use a synthetic lube in the diffs. The 140 weight can flow kinda slow if it is cold out so I am guessing that might have something to do with N/A's comment. (?) After all, he is in Canada and isn't it Always cold there? Maybe he left the lube outside of his igloo next to his dog sled and it froze? :wink:

J/K man!!

I hear you. I was in Bush Alaska for 4 years and that equates to a lifetime by our lower 48 standards. Witch tit cold!!!

JJsTJ · **Posted:** Sat Feb 10, 2007 1:05 pm

[quote="BVCRD
I hear you. I was in Bush Alaska for 4 years and that equates to a lifetime by our lower 48 standards. Witch tit cold!!!

[/quote]

I did 5 years in Anchorage when I was a kid. Don't know how I survived it as I get cold now when it hits 50 degrees. :roll:

I figure I can get away w/ busting chops on the whole dog sled/igloo thing as I heard alot of that after moving to NJ from AK. :wink:

BVCRD · **Posted:** Sat Feb 10, 2007 1:08 pm

JJsKJ wrote:

[quote="BVCRD
I hear you. I was in Bush Alaska for 4 years and that equates to a lifetime by our lower 48 standards. Witch tit cold!!!

I did 5 years in Anchorage when I was a kid. Don't know how I survived it as I get cold now when it hits 50 degrees. :roll:

I figure I can get away w/ busting chops on the whole dog sled/igloo thing as I heard alot of that after moving to NJ from AK. :wink:

[/quote]

Yea. It was a real treat to fly into Anch from Perryville or Chignic Lake. I was in there once for a year straight. I was the last one left who hadn't gotten out at least once. There was this little old lady and me, and then she died and got out so that left me. I wasn't complaining.

N / A · **Posted:** Sat Feb 10, 2007 1:09 pm

JJsKJ wrote:

BVCRD wrote:

N / A wrote:

have fun jamming 140 in there, I just did it and that stuff is thick

Isn't it supposed to be 75W140? Full synthetic like what came from the factory? I used a bottle pump and it flowed fine.

Yes, you really should use a synthetic lube in the diffs. The 140 weight can flow kinda slow if it is cold out so I am guessing that might have something to do with N/A's comment. (?) After all, he is in Canada and isn't it Always cold there? Maybe he left the lube outside of his igloo next to his dog sled and it froze? :wink:

J/K man!!

where else was I gonna leave it while I was out whale hunting on the the icebergs?

j/k yeah it was cold, I tried to get it as warm as I could, it was so thick it blew the seals out of my transfer pumps

BVCRD · **Posted:** Sat Feb 10, 2007 1:16 pm

N / A wrote:

JJsKJ wrote:

BVCRD wrote:

N / A wrote:

have fun jamming 140 in there, I just did it and that stuff is thick

Isn't it supposed to be 75W140? Full synthetic like what came from the factory? I used a bottle pump and it flowed fine.

Yes, you really should use a synthetic lube in the diffs. The 140 weight can flow kinda slow if it is cold out so I am guessing that might have something to do with N/A's comment. (?) After all, he is in Canada and isn't it Always cold there? Maybe he left the lube outside of his igloo next to his dog sled and it froze? :wink:

J/K man!!

where else was I gonna leave it while I was out whale hunting on the the icebergs?

j/k yeah it was cold, I tried to get it as warm as I could, it was so thick it blew the seals out of my transfer pumps

darn! Sounds like it would have blown the seals on my biceps pumping it in. I got a big cramp as it was,

Changing rear diff fluid

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