I drained the oil in my 12 bolt posi (68 Camaro) and would like to know which brand/type of oil to use. I was told this is quite critical.

As far as I know the only critical part is the posi additive. My rearend shop (and many others) have always advised using any name brand 90W gear oil plus the additive from the appropriate brand (Chevy, Ford, or whatever else you have). I've used most major brands of lube without any apparent differences and no problems at all. If you're just being extra careful, buy the lube from the dealer as well.

I will say the posi additive for a Ford rear is the nastiest smelling stuff ever! I accidentally got a drop on my shoe and the stench followed me around for days.

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Scott
'69 400SB, Richmond 5-speed
www.geocities.com/sdenning1 (http://www.geocities.com/sdenning1)

Oops. Since you asked, here is my recommendation. Amsoil Series 2000 80w-90 Synthetic gear oil. It does not need the additive as it was designed to meet the posi specs right out of the can. Ive used the Amsoil products in everything for over 25 years with excellent results. It will run cooler than petroleum gear oils. You will be able to put your hand on the cover plate. Try that with a petro lube.
If it runs cooler, that means less friction, which means longer life and better mileage.
My new Eaton Posi is running like a clock with it in my 69 Camaro right now.
I hope Big Gear Head drops a note in here as well. He sells tons of Eaton and other gear items in Kentucky and also recommends Amsoil.
Good luck http://www.camaros.net/forum/smile.gif
click

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69RS 350/255 LM1,TH350,Dover White,Blue Vinyl top
F&R spoilers,pdb,Close ratio ps,am/fm,3.08 Posi.,A/C,
fold down rear seat.
My RS www.brainerd.net/~knudsen/69RS (http://www.brainerd.net/~knudsen/69RS)

Click is right. The Amsoil 75W90 Series 2000 is the best that I have used in a posi rear end. I put it in all of the rear ends that I build, unless the customer just refuses to use it. You can check it out at www.lubedealer.com/biggearhead (http://www.lubedealer.com/biggearhead)

Click,
That "1000 parts" picture must have taken a while to set up. Cool.

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'69 RS/SS396 pro street
427/4spd/9"
Byars Performance
High Performance Drive Train Parts And Service
www.lubedealer.com/biggearhead (http://www.lubedealer.com/biggearhead)

[This message has been edited by big gear head (edited 07-12-2002).]

That 1000 part pic is someone else's from this site that did it,I just copied it for giggles. I laughed so hard cuz its so neat to see that. My wife would kill me if I tried that one.
click http://www.camaros.net/forum/smile.gif

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69RS 350/255 LM1,TH350,Dover White,Blue Vinyl top
F&R spoilers,pdb,Close ratio ps,am/fm,3.08 Posi.,A/C,
fold down rear seat.
My RS www.brainerd.net/~knudsen/69RS (http://www.brainerd.net/~knudsen/69RS)

Hey, Click !

What are those special frame connectors we see on the pic ? Who makes them and are they efficient ?

Frank.

Frank I dont have subframe connectors on my car, ( I dont think ) , those parts laid out on the lawn are someone elses camaro, not mine. Sorry I can help.
click

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69RS 350/255 LM1,TH350,Dover White,Blue Vinyl top
F&R spoilers,pdb,Close ratio ps,am/fm,3.08 Posi.,A/C,
fold down rear seat.
My RS www.brainerd.net/~knudsen/69RS (http://www.brainerd.net/~knudsen/69RS)

The guy who snapped that picture also fabricated those sub connectors... Do a search on this site, i'm sure you'll find him.

Amsoil here as well

John