Posi. rear end fluid

[Ryan Clark]

What is best for replacing fluid in Posi rear end? 80w90?
Is there any brand preference of what is available at local parts stores? I have the GM posi additive.

Thanks
Ryan

[Joe L.]

Re: Posi. rear end fluid

Ryan------

GM #1052271

[Joe L.]

Re: Posi. rear end fluid

Ryan------

GM #1052271

[Gary S.]

Re: Posi. rear end fluid

Joe's advice is always good and I would never go against it since you can usually count on the products of Mr. Goodwrench. However, I use Mobil 1 synthetic differential oil with the GM brand of positraction additive. It has worked well for me for the last 9 years.
Gary

[Gary S.]

Re: Posi. rear end fluid

Joe's advice is always good and I would never go against it since you can usually count on the products of Mr. Goodwrench. However, I use Mobil 1 synthetic differential oil with the GM brand of positraction additive. It has worked well for me for the last 9 years.
Gary

[Jerry G.]

Re: Trans lubricant (same)?

Do you use the same lubricant, 80W90, for the 4sp trans?

[Jerry G.]

Re: Trans lubricant (same)?

Do you use the same lubricant, 80W90, for the 4sp trans?

[Duke W.]

Re: Trans lubricant (same)?

The proper oil for the old four-speeds is a GL-5 SAE 80W-90 or 75W-90, either mineral oil based or synthetic. This is the same spec as for the diff, less the positraction additive.

Duke

[Duke W.]

Re: Trans lubricant (same)?

The proper oil for the old four-speeds is a GL-5 SAE 80W-90 or 75W-90, either mineral oil based or synthetic. This is the same spec as for the diff, less the positraction additive.

Duke

[Jerry G.]

Re: Thanks Duke *NM*

[Jerry G.]

Re: Thanks Duke *NM*