How often should you change the oil in your rearend??? Also how hard is this, and any other nice details would be appriciated. Thx.

 

I assume we're talking newer truck?..(gmt800?)

100k/...SOME trucks have a drain plug at the bottom of the pumpkin,making this simple...others,the cover has to come off.
Many quickie-lube places "suck" the oil out.

Here's the kicker..The rear end oil in these trucks is synthetic...The gm stuff is almost $25 a quart....it takes 3 or 4,depending on the rear end size....I'm sure there are cheaper oils,but DON'T USE the old 90W gear oil...it has to meet the requirements.

 

yea, its an 02 truck... sry, but i guess ill hold off on that one, seeing as i dont want to drop $100 for oil, and i only have about 68k miles...

 

I'm sorry I just found the title of this post hillarious!!!!!lol

 

lol, yea... didnt realize when i wrote it...

 

just be glad your rearend made it to 68k....mine made it to 3,800 miles and then took a **** on me!!lmao im the lucky guy who has the truck that falls under the .4% major defect category!! WHOOHOO!

 

well your problem was you let your rearend get all clogged up with gunk, and then it just exploded because of the pressure... Im a doctor/mechanic i should know jkjk

 

Check to see if you have the Eaton (G80) locking rear diff., there is a break in peroid for it. So if it has G80 I would change it right away because it probably has the original oil in it. It also requires a seperateadditive available from your dealer.

If it's the regular diff., I think it's like every six years or 60k whichever comes first.

 

The additive is for older g80's...(98,etc)...the gnt800's all take the synthetic oil....changed at 100k