Rear Gear Oil

[cjbronco]

I just had my 9" rebuilt with 3:70 in it. Which gear oil should I use?

 

[cowboydan]

some people say that using synthetics will wreck stuff, but i use royal purlple. hasn't hurt me yet. i've always used synthetic

 

[Broncoholics]

I've always used 80/90 weight gear oil.

 

[drcarter0734]

I am using Royal Purple also and have had no issues.

 

[Streetgang44]

I like Amsoil, or RP. You can go with synthetic......I cant see it causing a problem, and it will outlast conventional gear oil by far.