Help, rear diff oil change
Thread Starter
Burning Brakes
Joined: Aug 2017
Posts: 958
Likes: 177
From: Newark Delaware
Help, rear diff oil change
I'm in the middle of changing out the oil in my rear diff. I only got about 1.1 quarts out when i drained it. I have now added 2 quarts and 4 oz of limited slip additive and I'ts still not dripping out of the fill hole. I have the car completely level. I even stuck my pinky in the hole and it came out clean. I'm nervous about putting any more fluid in.
Help! Thanks
2000, A4, 94K miles
Help! Thanks
2000, A4, 94K miles
Drifting
Joined: Mar 2017
Posts: 1,486
Likes: 343
From: Long Island New York
Thats odd, did this last year, with car absolute level, just under 2 quarts and did not need the limited slip additive with Amsoil synthetic
Last edited by pjdbm; Apr 7, 2018 at 11:12 AM.
Thread Starter
Burning Brakes
Joined: Aug 2017
Posts: 958
Likes: 177
From: Newark Delaware
Here's a link to a site showing the change process.
http://www.toquez06.com/diff.html
Any chance you made an error?
http://www.toquez06.com/diff.html
Any chance you made an error?
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
I would be careful with that approach. Mine has always taken just shy of 2 quarts. If yours was low with no signs of leakage and isn't full with the proper amount something is amiss. I would want to understand why before driving it and hoping all is OK. It may be perfectly fine but based on your description something doesn't pass the smell test.
Thread Starter
Burning Brakes
Joined: Aug 2017
Posts: 958
Likes: 177
From: Newark Delaware
I would be careful with that approach. Mine has always taken just shy of 2 quarts. If yours was low with no signs of leakage and isn't full with the proper amount something is amiss. I would want to understand why before driving it and hoping all is OK. It may be perfectly fine but based on your description something doesn't pass the smell test.
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
i dont see how you can over fill it if the fill plug is horizontal.....and the car is level. fill it until it starts to dribble out.
Acct Suspended APR 2026 by request
Joined: Dec 2010
Posts: 10,367
Likes: 1,272
2020 Corvette of the Year Finalist (performance mods)
C5 of Year Winner (performance mods) 2019
maybe a longshot and just throwing ideas out there but does your car have an added diff cooler or even a c6 diff swap?... either of those would require more fluid but if everything is bone stock, the car is level, and the fluid isn't immediately leaking out somewhere, I don't see any way it could take over 2qts of fluid and not be leaking out of the fill hole or even able to feel it with your finger through the hole... I would fill it until fluid starts to dribble out of the fill hole regardless of how much you think it should take
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Le Mans Master
Joined: Sep 2014
Posts: 5,278
Likes: 539
From: Kelowna BC
A garage floor is generally not level, so if you went by distance from floor front and back that wouldn't be right. I use a level on the bottom of my car.
That said, I doubt being a bit off would alter the fluid level much.
That said, I doubt being a bit off would alter the fluid level much.
Burning Brakes
Joined: Apr 2017
Posts: 1,055
Likes: 104
From: Romeoville, IL
Exactly what I did. Mine started to dribble out about the 1.7 mark.