Rear Diff Service
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Joined: Apr 2006
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Rear Diff Service
ok this may have been touched on before, but my laptop is running slow so i cant search right now.
I am due for my rear diff service. I plan on doing it myself. I already have the LSD additive.
What grade of oil should I use, and can anyone recommend a brand?
also, is a gasket required once i crack the factory case?
I am due for my rear diff service. I plan on doing it myself. I already have the LSD additive.
What grade of oil should I use, and can anyone recommend a brand?
also, is a gasket required once i crack the factory case?
DC Insider
Joined: Aug 2005
Posts: 2,681
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From: cedar falls, ia
RE: Rear Diff Service
i used RTV when i changed mine, but with my new cover it has an O-ring that doesn't need to be changed....i always used Mobil 75W-90 i believe is what it was...but now i use Amsoil 75W-110
Administrator
Joined: Jul 2007
Posts: 24,686
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From: South Georgia/East Florida
RE: Rear Diff Service
Gasket or RTV is OK. I've used both, I don't think one is better than the other, although if you don't like the idea of having to scrape off the old sealant, go with the gasket...
Side note: I did the front & rear diffs on my Grand Cherokee along with engine oil and used Royal Purple all around about three weeks ago. Always been a full synth. guy, but hadn't tried the purple stuff till now. It was $7.99 a quart for the engine oil, but buy one get one free special, so I gave it a shot. I don't know if it's the motor oil or the diffs or a combo, but I'm seeing a solid 2 mpg increase over dino oil in the diffs (I got it that way) and mobil one (Iput inwhen I bought it 5 months ago) in the crank...
Side note: I did the front & rear diffs on my Grand Cherokee along with engine oil and used Royal Purple all around about three weeks ago. Always been a full synth. guy, but hadn't tried the purple stuff till now. It was $7.99 a quart for the engine oil, but buy one get one free special, so I gave it a shot. I don't know if it's the motor oil or the diffs or a combo, but I'm seeing a solid 2 mpg increase over dino oil in the diffs (I got it that way) and mobil one (Iput inwhen I bought it 5 months ago) in the crank...
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Joined: Aug 2007
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RE: Rear Diff Service
ORIGINAL: hemiyellow
i used RTV when i changed mine, but with my new cover it has an O-ring that doesn't need to be changed....i always used Mobil 75W-90 i believe is what it was...but now i use Amsoil 75W-110
i used RTV when i changed mine, but with my new cover it has an O-ring that doesn't need to be changed....i always used Mobil 75W-90 i believe is what it was...but now i use Amsoil 75W-110
DC Insider
Joined: Aug 2005
Posts: 2,681
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From: cedar falls, ia
RE: Rear Diff Service
http://www.mag-hytec.com/store/index...31efbaf03241bd
i'm sure you can find em cheaper somewhere, but thats just the site i had saved
i'm sure you can find em cheaper somewhere, but thats just the site i had saved
Champion
Joined: Aug 2007
Posts: 4,702
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From: N. Florida
RE: Rear Diff Service
Was the weight of the oil changed in later years? My '03 wants 75w-140. Synthetic only.
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RE: Rear Diff Service
no mike you're right, 75 140 in the rear 75 90 in front, you can use 110 for the front if you want. And use amsoil for the fluid and rtv is the best way to go, I dont even think you can get a gasket for the front (haven't checked online) the rear is a 9.25 and front is a 8.25 right? I know I'm 100% on the rear and about 90% for the front.
