[zfiero]

Want to change the rear diff and transfer case fluid. Does anybody know the capacities of each I now it it is 75 90 syn oil. Would like to figure it out before I drain it so I have enough fluid to fill it back up so I dont have to run back and fourth to store. Owners manual does not state how much. ???

 

[zfiero]

Changed my fluid I used about 2 1/2 qt., Rear diff was pretty easy, Transfer case was a little tight. You need to use a pump to get in otherwise impossible. Both drain plugs have magnets on them to collect the garbage transfer case was not to dirty, the rear diff magnet was covered with garbage I guess from break in. Worth the effort to get the oil out after break in.

 

[6Sixathome]

Nice job :thumb: What kind of synthetic oil did you put in?

 

[zfiero]

I used Castrol Syntec gear fluid. I never had any issues with there oils. I just did my Blazer to nice and smooth.

 

[ponchonutty]

Are you guys sure there isn't any sort of friction modifier needed in the diff?

 

[tsc1969]

I don't think friction modifiers are used when synthetic gear oil is used.
Tim C.

Are you guys sure there isn't any sort of friction modifier needed in the diff?

 

[medicrxdoc]

Friction modifiers are usually added to aid with a limited slip differential. I don't know if the lambdas have these.

As for not needing them with synthetics, some already have them in the formula so no additional modifier is needed.

If you would experience the rear end "chatter" from not having one, it could always be added later.

 

[ponchonutty]

OK thanks for the info. I'll research it a little more to be sure. Just picked an '07 XR with about 55k on the clock so now would be a good time to get some new lube in it.