Rear Diff

[Justin Fleming]

So I was going to change the diff fluid and I had a few questions:

1. are people just silicone sealing the cover or using a gasket
2. when putting lube back in do we need to add the whal sperm additive
3. what lube and how much do I need to refill

Axles seal is leaking along with the wheel cyclinder so I wanted to do it all at once....

thanks

 

[paratrooper307]

So I was going to change the diff fluid and I had a few questions:

1. are people just silicone sealing the cover or using a gasket
2. when putting lube back in do we need to add the whal sperm additive
3. what lube and how much do I need to refill

Axles seal is leaking along with the wheel cyclinder so I wanted to do it all at once....

thanks

1. I like to use RTV, but gaskets are less messy.

2. You shouldn't need an additive unless you are running an LSD that calls for it. Open diffs and gov-locks don't need additive.

3. Check your owner's manual, but 80w-90 is standard for these trucks. Capacity depends on your axle. Mine holds about 4 quarts, I just fill until it starts to dribble from the fill hole. The ten bolt axles won't hold that much.

 

[skunked]

^^ this and I use rightstuff without any gaskets.

 

[76k5blazerr]

I used a fel pro on my 12 bolt, the diff cover isn't leaking, still need to fix the pinion seal though.

 

[76zimmer]

if this is a somewhat frequent thing, use a lubelocker gasket!

 

[MNorby]

If this is a diff you planning on keeping and using for a while invest in a lube locker gasket. They are reusable and don't have to clean off rtv every service. If this is a once and done service and don't plan on having to get into it again then for rtv I prefer Right Stuff brand.

 

[Deuling]

Yup. Be forewarned. When you use right stuff, it's a pain in the a$$ to get the cover off next time. The stuff works well....

I prefer a gasket myself.