Gear oil
 

What weight / type gear oil should I run in my new axles?

14bff rear with factory eaton gov-lock?

D60 open front?

Thanks
-RMK

Re: Gear oil
 

I always use 80W90 in my axles, manual tranny and transfer case.

I'll let some one who knows advise if the gov-lock needs an additive - I don't believe it does, but someone will know for sure.

Re: Gear oil
 

Interesting because when i did the Front 60 and rear sterling 10.5 in my superduty the manual called for 70w90 in front and 70w140 in the rear, or something to that effect.

I remember I didnt have to use the slip additive in rear due to the open diff. but it called for so many ounces of something if it had a posi.

Re: Gear oil
 

I run synthetic 75W-90, D44 front and Eaton rear. Always thought 140 was only required in trucks larger than pickups...

Re: Gear oil
 

In my old chevys I run 80-90 throughout

In my dodge I run 80-90 in the front and t-case with a healthy dose of Lucas the rear has 85-140 lucas extreme service lube

Re: Gear oil
 

Ya x2 Gotta agree!

Re: Gear oil
 

80w90 in the 60/14 and 205

Re: Gear oil
 

Dito!
Additive should be use when you have a Posi or limited slip w/clutches :uhmk:
I use to run Dana Powr-Lok and they required the 4oz shot of additive, I love the smell! makes me think of metal shop and my testosterone levels rise hahahaaa :lol:

Re: Gear oil
 

Thanks gentlemen, info is appreciated.

Re: Gear oil
 

Synthetic for cold country pumpability and lower wear and tear on the bearing and gear teeth mating surfaces.