What gear lube to use???

[PaulRV6]

What is the best rear end gear lube to use with the stock posi-traction? I presently have KB gear lube but I don't feel like spending the money to buy his stuff. What else is good?

paul

 

[87gninpa]

Ive been using the gm stuff and two bottles of gm posi additives and never had a problem. usually change every 20k and have yet to see excessive metal buildup. id go witht he gm stuff if i were you, just remember to use two bottle of additives

 

[FlyinGN]

I changed mine to Amsoil synethic fluid and developed a pinion seal leak Then I changed it to Lucas HD diff fluid and now it stopped and no chatter without GM additive..

 

[PaulRV6]

I like the idea of using the GM stuff but what is the additive called?
Thanks 87gninpa

 

[87gninpa]

The additive i got at gm, just ask for it over the counter in the parts area. they gave me 3 qts of gear oil and two bottles of additive(all gm stuff) and it works great

 

[87gninpa]

i think they actually call it "limited slip diff fluid" or something like that. same stuff

 

[turbo nasty]

Stay away from the synthetics...Eaton(is what most all OEM posi units where) actually gives instructions not to use the syn oil(just installed a brand new one in my 86).

Here is what I have had the best of luck with: Lucas oil stailizer, limited slip additive and valvoline75w90.

 

[Geoff87]

I use Amsoil WITH the GM additive.