What oil for rear end - Team Camaro Tech
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post #1 of 21 (permalink) Old Oct 9th, 14, 10:23 PM Thread Starter
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mike
 
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What oil for rear end

Hi could someone recommend the right rear end oil for my 10 bolt? Thank you.
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post #2 of 21 (permalink) Old Oct 10th, 14, 02:55 AM
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Re: What oil for rear end

Hi Mike,
I always use Valvoline 80W-90 Conventional Gear Oil. If you have a Posi, also add one bottle of GM Limited Slip Additive.

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post #3 of 21 (permalink) Old Oct 10th, 14, 03:07 PM
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Re: What oil for rear end

Me too. Sta-lube 80w90 GL4. I went with the Ford Racing CM-19546-A1 Friction modifier for the posi.

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post #4 of 21 (permalink) Old Oct 10th, 14, 03:11 PM
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Re: What oil for rear end

Valvoline 80w90 Durablend. It already has the friction modifier in it for posi.
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post #5 of 21 (permalink) Old Oct 10th, 14, 03:28 PM
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Mike
 
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Re: What oil for rear end

Lucas oil 80w 90 add the gm limited slip additive if posi as mentioned


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post #6 of 21 (permalink) Old Oct 11th, 14, 07:23 AM
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Re: What oil for rear end

I also use Sta-lube 80w90 GL4 and one bottle of GM Limited Slip Additive (additive only if it's a limited slip positraction differential).

69 Camaro Z/28 RS, original Azure Turquoise, M21 & 3.73 12-bolt posi. NOM 406ci, AFR 210 heads, Straub hyd. roller cam & Dynatech 1-3/4" > 1-7/8" headers, QuickFuel 750 Annular. Photos at:
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post #7 of 21 (permalink) Old Oct 11th, 14, 08:51 AM
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Re: What oil for rear end

Amsoil 80w-90, if its a posi, their gear lubes already have the posi additive in it. It worked great in my 12 bolt Eaton posi.
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post #8 of 21 (permalink) Old Oct 14th, 14, 07:53 PM
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Re: What oil for rear end

If you're running a posi (limited slip) carrier, Eaton (who makes the carrier) recommends against synthetics. Run the recommended conventional gear oil instead, 75w90 or 80w90, with the GM additive.

If she's not posi-traction, run most any quality gear oil.
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post #9 of 21 (permalink) Old Oct 20th, 14, 10:54 PM
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Re: What oil for rear end

And just some unsolicited advice (if you haven't done the oil change before): make sure you can get the fill plug out before you crack open the rear cover and drain all the old oil out!

I almost didn't check but when I did I found it was stuck pretty good. There wasn't a lot of room under there for leverage and I couldn't get it to budge, so I drove down to a local shop. They put it on a lift, cracked the plug open then closed again. Took it home and was able to get it out easy peasy. I wish I could say the same about getting that thick *** oil into the diff...

1967 350, Hurst TKO 600 5 speed, 12 bolt 3:55 posi, RS added

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post #10 of 21 (permalink) Old Oct 21st, 14, 06:28 AM
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Re: What oil for rear end

Break down and buy one of these to refill your gear oil.


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post #11 of 21 (permalink) Old Oct 21st, 14, 07:29 AM
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Re: What oil for rear end

Quote:
Originally Posted by 67Carl View Post
And just some unsolicited advice (if you haven't done the oil change before): make sure you can get the fill plug out before you crack open the rear cover and drain all the old oil out!

I almost didn't check but when I did I found it was stuck pretty good. There wasn't a lot of room under there for leverage and I couldn't get it to budge, so I drove down to a local shop. They put it on a lift, cracked the plug open then closed again. Took it home and was able to get it out easy peasy. I wish I could say the same about getting that thick *** oil into the diff...
Worst case scenario (if you don't care about originality), they make aluminum diff covers with a fill and a drain hole in them.


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post #12 of 21 (permalink) Old Oct 21st, 14, 01:43 PM
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Re: What oil for rear end

Quote:
Originally Posted by COPO View Post
Break down and buy one of these to refill your gear oil.

Where do you get this (and what specifically is it called?)? Good grief I wish I had something like that when I did mine! My hands and arms were aching from holding the bottle up and trying to squeeze that molasses/oil out. Seems like it took an hour just to do that part.

1967 350, Hurst TKO 600 5 speed, 12 bolt 3:55 posi, RS added

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post #13 of 21 (permalink) Old Oct 21st, 14, 01:48 PM
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Re: What oil for rear end

Quote:
Originally Posted by 67Carl View Post
Where do you get this (and what specifically is it called?)? Good grief I wish I had something like that when I did mine! My hands and arms were aching from holding the bottle up and trying to squeeze that molasses/oil out. Seems like it took an hour just to do that part.
When I filled the diff up, I used a hose barb and a short section of clear hose to fill it up. Of course the r side tire was off and the car on jack stands.
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post #14 of 21 (permalink) Old Oct 21st, 14, 01:48 PM
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Re: What oil for rear end

Quote:
Originally Posted by 67Rally View Post
Worst case scenario (if you don't care about originality), they make aluminum diff covers with a fill and a drain hole in them.
I thought about it as my cover isn't original but I just replaced the plug with a different one. The existing plug had a square thing on the end that made using a socket difficult (I didn't have a deep one in that size). Then I cleaned the cover and painted it. I also used teflon tape on the threads so I think there won't be a problem getting it off next time.
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1967 350, Hurst TKO 600 5 speed, 12 bolt 3:55 posi, RS added

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post #15 of 21 (permalink) Old Oct 21st, 14, 03:09 PM
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Re: What oil for rear end

Those square head plugs can be a problem. There are several tool supply companies that make 8-point sockets. They are real handy for both the diff. and the Muncies. Cheers, Fred
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