Rear Diff. Fluid
Thread Starter
Racer
Joined: May 2003
Posts: 484
Likes: 0
From: L. I. NY
Rear Diff. Fluid
I had my rear seal replaced at 17,000 mi.
In order to change the seal, they must have to drain and refill the fluid, right?
I would like to put Synthetic rear fluid in myself sometime in the near future.
Does anyone know if it would hurt the seals or internal parts if whatever small amount is left in the rear when I drain it gets mixed with the Synthetic when refilling? Hope I explained it correctly. :seeya
In order to change the seal, they must have to drain and refill the fluid, right?
I would like to put Synthetic rear fluid in myself sometime in the near future.
Does anyone know if it would hurt the seals or internal parts if whatever small amount is left in the rear when I drain it gets mixed with the Synthetic when refilling? Hope I explained it correctly. :seeya
Le Mans Master
Joined: Oct 1999
Posts: 8,205
Likes: 40
From: Tucson AZ
Re: Rear Diff. Fluid (LS7)
You shopuld be fine with any of the major synthetics; RedLine, Amsoil, Mobil 1, or Royal Purple. I have had good luck with Amsoil, as noted above. Just be sure the car is level when you fill the diff. Enjoy. :yesnod: :)
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Re: Rear Diff. Fluid (LS7)
Just did mine last weekend. As noted, keep the car level. One good thing, the rear on this car actually has a drain. Try not to get anything on the rear spring, and if you do, don't use chemicals to remove from the spring. I used the Amsoil Series 2000, already has the additive in it. Make sure you have a good way to pump the new oil into the rear. If it is cool out, it will pump like molasses. Good luck.
Burning Brakes
Joined: Oct 1999
Posts: 1,041
Likes: 0
From: Charleston SC
Re: Rear Diff. Fluid (carpe dm)
carpe dm-
Mobil 1 makes Mobil 1 Synthetic Gear Lubricant 75W-90 and Mobil 1 Synthetic Gear Lubricant LS 75W-140. Do you know which of these we should use in the diff and if they require the addition of a friction modifier like the GM stuff?
Thanks!
Mobil 1 makes Mobil 1 Synthetic Gear Lubricant 75W-90 and Mobil 1 Synthetic Gear Lubricant LS 75W-140. Do you know which of these we should use in the diff and if they require the addition of a friction modifier like the GM stuff?
Thanks!
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Safety Car
Joined: Sep 2001
Posts: 4,596
Likes: 2
From: Atlanta GA
Re: Rear Diff. Fluid (George Cooper)
carpe dm-
Mobil 1 makes Mobil 1 Synthetic Gear Lubricant 75W-90 and Mobil 1 Synthetic Gear Lubricant LS 75W-140. Do you know which of these we should use in the diff and if they require the addition of a friction modifier like the GM stuff?
Thanks!
Mobil 1 makes Mobil 1 Synthetic Gear Lubricant 75W-90 and Mobil 1 Synthetic Gear Lubricant LS 75W-140. Do you know which of these we should use in the diff and if they require the addition of a friction modifier like the GM stuff?
Thanks!
Here is my how to:
http://www.woosch.com/tranny_diff_fluid_change.htm
Burning Brakes
Joined: Jan 2002
Posts: 1,147
Likes: 1
From: Geismar LA
Re: Rear Diff. Fluid (carpe dm)
I've used Redline 75W90 just like it came out of the bottle with no problem, ie, no additional friction additive needed. Also, if you don't want to invest in a drill pump (or any pump), a funnel with a hose attachment works just fine. Just insert the rubber hose into the fill hole and come out at the back of the car and attach the other end of the hose to a clean funnel. Then slowly pour in your new fluid (it takes a little less than 2 quarts). When its close, I watch for a little fluid seeping out around the hose, then I remove the hose and check to make sure the fluid is up to the edge of the hole. If its too full, let it seek a level with the edge of the hole and them install the plug. Of course, the car should be level to get the correct amount in. Level means that the front and rear tires are the same distance off the ground. Also, I think there is a ring gasket on the plug, if so, make sure you install it (and the tag that shows the ratio). I have a pic of my rig, email or IM me if you want it.