differential fluids

[Gangly]

7 hours ago, Minnvmax said:

Im going to take a HUGE chance and run the same thing in both axles.....

What mentally deficient group of designers at GM thought it would be cool to make them that close, BUT different!? Unbelievable. 

 

Front Axle – Four-Wheel Drive SAE 75W-90 Synthetic Axle Lubricant (GM Part No. 88900401, in Canada 89021678). 

 

Rear Axle (1500 Series) SAE 75W-85 Synthetic Axle Lubricant (GM Part No. 19300457, in Canada 19300458). 

No reason to take a HUGE chance, you can tell which manufacturer by looking directly at the differentials themselves

 

 

[Ronjon]

Dang it, I thought they both took 75w85 high efficiency synthetic ac Delco gear oil. Guess I'll have to match them up to the picture and rpo code then order some more gear oil. At 11.50 a quart I hope one of them takes it lol.

[swathdiver]

17 hours ago, Minnvmax said:

What mentally deficient group of designers at GM thought it would be cool to make them that close, BUT different!?

Just guys who've forgotten more than you'll ever know about cars.  

 

You should see the latest specs!  LOL