Positraction rear end lube

[Jerry A.]

For a positraction rear end do you recommend using a synthetic or mineral base lube? Why?

[Duke W.]

Re: Positraction rear end lube

I recommend the GM axle oil and additive because they are compatible, and I know they work. I haven't tried any of the modern synthetics, but I've heard that Redline 75W-90 works well as it because it already has the additive added.

I don't think a synthetic is much of an advantage in a street driven car because the diff isn't going to get the oil hot enough for the sythetic's higher thermal breakdown temperature to do much good, so I just stick with what I know works.

Duke

[Duke W.]

Re: Positraction rear end lube

I recommend the GM axle oil and additive because they are compatible, and I know they work. I haven't tried any of the modern synthetics, but I've heard that Redline 75W-90 works well as it because it already has the additive added.

I don't think a synthetic is much of an advantage in a street driven car because the diff isn't going to get the oil hot enough for the sythetic's higher thermal breakdown temperature to do much good, so I just stick with what I know works.

Duke

[Jerry A.]

Re: Positraction rear end lube

Thanks Duke

Jerry

[Jerry A.]

Re: Positraction rear end lube

Thanks Duke

Jerry

[Joe L.]

Re: Positraction rear end lube

Jerry and Duke-----

Although I'm a big fan of synthetics, I also recommend the use of the conventional GM positraction gear lube and additive. These have worked so perfectly for so long that I'm reluctant to use any newer technology for this application.

[Joe L.]

Re: Positraction rear end lube

Jerry and Duke-----

Although I'm a big fan of synthetics, I also recommend the use of the conventional GM positraction gear lube and additive. These have worked so perfectly for so long that I'm reluctant to use any newer technology for this application.

[Jerry A.]

Re: Positraction rear end lube

Thanks Joe. Appreciate your help!

Jerry

[Jerry A.]

Re: Positraction rear end lube

Thanks Joe. Appreciate your help!

Jerry

[Don Shirey]

Midyear Positraction rear end lube capacity?

Hi guys,
Can anyone tell me the approx. amount of Posi lube and
additive for a midyear. Couldn't find spec. in 63-65 manual
and supplements.

Thanks,
Don #31553

[Don Shirey]

Midyear Positraction rear end lube capacity?

Hi guys,
Can anyone tell me the approx. amount of Posi lube and
additive for a midyear. Couldn't find spec. in 63-65 manual
and supplements.

Thanks,
Don #31553

[John H.]

Re: Midyear Positraction rear end lube capacity?

Don -

Capacity is about 3-3/4 pints; put a 4-oz. bottle of GM Posi Additive in first, then add the hypoid lube.

[John H.]

Re: Midyear Positraction rear end lube capacity?

Don -

Capacity is about 3-3/4 pints; put a 4-oz. bottle of GM Posi Additive in first, then add the hypoid lube.

[Don Shirey]

Thanks John, see you Sunday! *NM*

[Don Shirey]

Thanks John, see you Sunday! *NM*