I have a 92 Fullsize Blazer, 4WD. Don't have a owners manual. How much gear oil goes into both diff.? And what weight gear oil? Also, the rear diff. is LSD rear end. What LSD additive and how much goes in the rear diff.? Wish I could find a Chevy owners manual. Thanks, gearyr

 

Should be regular 80w90 gear lube for both front and rear diffs. If you have G80 on your RPO code label inside the glove box, then it is not really a limited slip differential, but rather, an automatic locking differential. If this is the case, then you do not require any special friction modifiers to be added.

 

Thank you! I will check for the code in the glove box. When I bought the 92 Blazer, it didn't have a Chevy owners manual with it. Thanks again. gearyr

 

the haynes book number is 24064 i believe thats wat it is for my 90 fullsize and it costs 24 buks from any auto store or online book store