Different viscosity gear oil for front & rear...

[billybronco]

...differentials?

Front calls for 75W90.

Rear calls for 90.

Is it not a good idea to use 75W90 all the way around in both diffs as well as my transfer case???

Thanks in advance....

 

[Mtbcoach]

That's what I'm running in all 3, royal purple 75/90w...

 

[hman913]

The majority of people use 75W90 for the front and rear diffs, as well as the t-case and manual transmission. I've been using Mobil1 since the beginning.

 

[REKCUT]

RP 75/90w here.