75w90 vs 75w140

[usaf_branham]

Is there any benefit from running the 75w90 syn gear oil as opposed to the 75w140 syn the manual calls for? I have heard mixed things about this.

Im getting 4.10's replaced with 3.73's and all new bearings. Im thought about using AMSoil, but I will probably end up going with Mobil 1 just for the simple fact that I can get Mobil 1 anywhere (and i dont like mlm companies). What is your thoughts?

 

[ItsStock02]

Im running 75w90 Mobil 1 synthetic in my rear. No problems at all and its as quiet as stock. I only went with 75w90 cause thats what Autozone had.

 

[BannonJr]

I ran 75w90 svg from amsoil , but later went back to the 140,
I'm an amsoil dealer and can get some out to ya if you like, shoot me a pm