Changed differential fluid today.
Thread Starter
Safety Car
Joined: Jan 2001
Posts: 4,660
Likes: 3
From: South Central Louisiana
St. Jude Contributor
Changed differential fluid today.
I want to make some notes for the archives.
1.Let spare tire down and check pressure(mine had 0psi, that would have been nice on the roadside)
2.Remove carrier(save a trip to the tool chest, you will need a 13mm to remove the rear carrier mounts.)
3.Remove the diff oil plug. It is on the passenger side, FORWARD of the halfshafts. :confused: (a little harder to get to than a C3 diff plug) You will need a 3/8 allen wrench. (mine wasn't ultra tight, if it was more special tools would be needed.)
4.Pump old oil out.
5.Pump new limited slip additve and then 80/90w oil in. (I bought an electric oil pump years ago from JC Whitney, a must have for a do it yourselfer.)
6.Reverse removal, you are done. :)
Note: I bought my slip additive and gear oil from a local delco parts house. Both of the part#s for these items doesn't come up on GM parts directs site. Must be a delco parts house special item.
additive 10-4003 (88900330)
gear oil 10-4002 (88900329)
If someone wants to post the part#s for the dealer items, that would be cool.
[Modified by LAvetteman, 10:41 PM 10/11/2003]
1.Let spare tire down and check pressure(mine had 0psi, that would have been nice on the roadside)
2.Remove carrier(save a trip to the tool chest, you will need a 13mm to remove the rear carrier mounts.)
3.Remove the diff oil plug. It is on the passenger side, FORWARD of the halfshafts. :confused: (a little harder to get to than a C3 diff plug) You will need a 3/8 allen wrench. (mine wasn't ultra tight, if it was more special tools would be needed.)
4.Pump old oil out.
5.Pump new limited slip additve and then 80/90w oil in. (I bought an electric oil pump years ago from JC Whitney, a must have for a do it yourselfer.)
6.Reverse removal, you are done. :)
Note: I bought my slip additive and gear oil from a local delco parts house. Both of the part#s for these items doesn't come up on GM parts directs site. Must be a delco parts house special item.
additive 10-4003 (88900330)
gear oil 10-4002 (88900329)
If someone wants to post the part#s for the dealer items, that would be cool.
[Modified by LAvetteman, 10:41 PM 10/11/2003]
Melting Slicks
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From: 1,000,000,001 Posts
Re: Changed differential fluid today. (LAvetteman)
I just did mine last week the same way, from what I have heard the way we did it, you just dont get alll the fluid out. I sat there for about 2 hrs trying to get every last drop out that I could, I would wait about 10 to 15 minutes between pumps to let some ozz down to the bottom of the carrier and pump it out, it worked pretty good.....
:chevy
:chevy
Safety Car
Joined: Nov 2001
Posts: 3,753
Likes: 191
From: Orange County California
Re: Changed differential fluid today. (1990CORVETTE)
i did mine yesterday too but thats cause i had the hole rear end out for a swap. Amazing how easy it is to change when you can just tip it on its side and then pour the new stuff in tith a funnel. I recomment drilling and tapping a drain plug for future changes
Instructor
Joined: Dec 2001
Posts: 210
Likes: 0
From: Helotes TX
Re: Changed differential fluid today. (LAvetteman)
I did mine last year and left the spare carrier in place. No problem.
I also used Amsoil synthetic 110/140 or something along those lines. The reason was the diff picks-up alot of heat from their proximity to the exhaust pipes. The neat thing was I did not need the $10.00 bottle of additive.
And while you may not get every last drop out 99% new is better than nothing! Besides, unless you solvent wash every little nook & cranny on each part in the diff you will always have some old residue mixing it up with the new stuff. :boxing
I also used Amsoil synthetic 110/140 or something along those lines. The reason was the diff picks-up alot of heat from their proximity to the exhaust pipes. The neat thing was I did not need the $10.00 bottle of additive.
And while you may not get every last drop out 99% new is better than nothing! Besides, unless you solvent wash every little nook & cranny on each part in the diff you will always have some old residue mixing it up with the new stuff. :boxing
Thread Starter
Safety Car
Joined: Jan 2001
Posts: 4,660
Likes: 3
From: South Central Louisiana
St. Jude Contributor
Re: Changed differential fluid today. (Texas CE)
:iagree:
One more thing I forgot to mention, as with my 71, after I pumped out the old stuff I rinsed my tubes with fresh no name brand 90w and filled the differential with the stuff. Got even more old stuff out. :thumbs:
One more thing I forgot to mention, as with my 71, after I pumped out the old stuff I rinsed my tubes with fresh no name brand 90w and filled the differential with the stuff. Got even more old stuff out. :thumbs:
Advanced
Joined: May 2003
Posts: 56
Likes: 0
From: Virginia Beach Virginia
Re: Changed differential fluid today. (LAvetteman)
Sounds a lot easirer and less expensive than what was described to me and quoted at the national lube change place. I will try it next week and see how easy or hard it is. Any particular kind of pump you recommend?
Thread Starter
Safety Car
Joined: Jan 2001
Posts: 4,660
Likes: 3
From: South Central Louisiana
St. Jude Contributor
Re: Changed differential fluid today. (2U Biggs)
Sounds a lot easirer and less expensive than what was described to me and quoted at the national lube change place. I will try it next week and see how easy or hard it is. Any particular kind of pump you recommend?
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