Hi there,
How can I see what kind of rear axle I have, whith or whitout limited slip?? ( locking differential)
Is it coded in vin?
Need an oil change, 250 K!! What oil!?
Thanx for helping out!

 

sticker in glove box tells the codes
of rear end gears

 

Jack up the rear of the vehicle and put it in neutral. Rotate the driveshaft. If both wheels turn the same direction you have a limited slip. While your at it, make a mark on the driveshaft and a mark on a tire. Turn the wheel one full revolution and count the number of times the driveshaft rotates and a rough estimate at how much it turns in addition. 3 full revilutions and almost 1/4 would be close to a 3.23:1 differential. There are only so many common gear ratios that it could fall close to. Other than that there are some online calculators you can use. If you know the diameter of your wheel and if you run in 3rd gear which is 1:1. You will be able to figure gear ratio based upon RPM vs. MPH(assuming your guages are fairly accurate).

Options if your RPO sticker is missing.

 

rpo in glovevox

g80 is locker
ut6 is 3.42
gt4 is 3.73
gt5 is 4.10


going from the top of my head.... coule be off a number on the gt4 and 5


and if your talking rear end oil, Synthetic gear oil.

 

i have a 2001 chevy blazer 2dr 5 speed
with a g80 locker and cleaning off rpo sticker
and took the numbers off i think it was a gt5
which is a 410 does this sound right?

 

you are correct.

I myself didn't know they offered the 4.10's in 2001 though. I couldn't find any 98+ with 4.10's when I was looking for axles.

 

Plug your Vin into the Vin decoder at compnine.com