Rear Diff Fluid change - discuss
Thread Starter
Le Mans Master
Joined: Apr 2000
Posts: 5,981
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From: Houston,Tx. USA
Rear Diff Fluid change - discuss
Figuring 24K is time to refresh the rear diff fluid (easy 24k miles);
What fluid did you use?
Friction modifiers, etc?
Technique or steps (I realize you drain it and refill it);
Will hand pump work?
Any other points of interest?
What fluid did you use?
Friction modifiers, etc?
Technique or steps (I realize you drain it and refill it);
Will hand pump work?
Any other points of interest?
Team Owner
Joined: Apr 2001
Posts: 54,204
Likes: 180
From: S.W. Ohio. . . . . . NRA Life Member
Re: Rear Diff Fluid change - discuss (Chopper Larry)
Chopper; if you haven't had any issues with the factory fluid and the factory friction modifier - then why not refill with the same stuff again?
For filling, I attach clear tubing to the fluid bottles tapered spout, hold the bottle sideways, and just squeeze.
But just be sure the tubing is secure on the bottle nozzle; or you'll squirt diff fluid across your garage floor. Don't ask me "how" I know this :bb
[Modified by Mike Mercury, 4:35 PM 6/24/2004]
For filling, I attach clear tubing to the fluid bottles tapered spout, hold the bottle sideways, and just squeeze.
But just be sure the tubing is secure on the bottle nozzle; or you'll squirt diff fluid across your garage floor. Don't ask me "how" I know this :bb
[Modified by Mike Mercury, 4:35 PM 6/24/2004]
Team Owner
Joined: Apr 2001
Posts: 36,453
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From: Overwhelmed as one would be, placed in my position.... DFW, TX
St. Jude Donor '05
Re: Rear Diff Fluid change - discuss (Chopper Larry)
I used the Redline gear oil. It comes with the friction modifier included already. 
Melting Slicks
Joined: Aug 1999
Posts: 3,452
Likes: 3
From: Spring, TX
Re: Rear Diff Fluid change - discuss (Umrswimr)
Remember to remove the fill plug then the drain plug otherwise when it drains it will slosh all over the garage floor. The old oil is thick, greenish black and smells real bad. 
It is a major PIA to clean up and will stain anything.
I second the use of the Redline Gear Oil. They make two versions one with the modifier and one without. Just make sure you get the right one. You will need two bottles but you will barely use any of the second one. Just keep it on hand for the next change.
It is a major PIA to clean up and will stain anything.
I second the use of the Redline Gear Oil. They make two versions one with the modifier and one without. Just make sure you get the right one. You will need two bottles but you will barely use any of the second one. Just keep it on hand for the next change.
Thread Starter
Le Mans Master
Joined: Apr 2000
Posts: 5,981
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From: Houston,Tx. USA
Re: Rear Diff Fluid change - discuss (Chopper Larry)
I can barely hear a LITTLE SHORT grind or groan on a slow right turn...that made me think rear fluid.
I knew I could depend on you guys!
Gonbad....how's the big "D" still?
I knew I could depend on you guys!
Gonbad....how's the big "D" still?
Melting Slicks
Joined: Aug 1999
Posts: 3,452
Likes: 3
From: Spring, TX
Re: Rear Diff Fluid change - discuss (Chopper Larry)
I finished grad school in December. I am trying to get out of here as fast as I can. Looking like back to Houston or New York City. If NYC then all the cars will go as I will live in Manhattan. That is the only drawback!
Team Owner
Joined: Mar 1999
Posts: 22,025
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From: At the beach in little Rhody
Re: Rear Diff Fluid change - discuss (gonbad)
Amsoil here, good results also. I also cover the rear spring before I start just in case. I wouldn't want to get that stuff on it.
Team Owner
Joined: Mar 2001
Posts: 25,889
Likes: 7
From: Virginia Beach
CI 3-5-6-7-8 Veteran
Re: Rear Diff Fluid change - discuss (vettenuts)
I'll be filling mine up w/ AMSOIL in a few weeks when I prep my car for Viperdays. It comes w/ the friction modifier in it allready.
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Safety Car
Joined: Dec 2003
Posts: 3,743
Likes: 1
From: Keep Me Working...Buy A Ford!
Re: Rear Diff Fluid change - discuss (Chopper Larry)
I just changed mine a couple of weeks ago. Go to http://www.vetteshop.cc and click on "misc". They have GM 75w90 synthetic lube (2 qts) and GM limited slip additive. Their prices are great, and their service was better. I ordered on Saturday, and it was on my doorstep on Wednesday. You'll need a 10mm allen head socket for the top and bottom plugs. When you're all done, torque the plugs at 26 ft lbs. 
Premium Supporting Vendor
Joined: Aug 2001
Posts: 5,364
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From: King George VA
Re: Rear Diff Fluid change - discuss (Autoworker)
I use AMSOIL Series 2000 75w90 which has friction modifier in it. AMSOIL also makes a synthetic 75w90, which also has the friction modifier in it. Both are recommended and warrantied by AMSOIL for the C5/Z06.
AMSOIL does make a friction modifier (product code ADA), but my car doesn't seem to need it. My diff doesn't chatter with the Series 2000 75w90. FYI, AMSOIL rates this fluid as "fill for life" for normal service use.
I just changed mine out this weekend. Changeout is very simple once you get the right stuff. I use a $3 oil pump I bought at the local autostore to pump the fluid up into the diff (and I have another one for the tranny fluid).
More info on the AMSOIL product line can be found here:
Independent AMSOIL Dealer
AMSOIL Corporate Homepage
You can find the applicable AMSOIL products for any of your cars here:
AMSOIL Online Product Application Guide
AMSOIL does make a friction modifier (product code ADA), but my car doesn't seem to need it. My diff doesn't chatter with the Series 2000 75w90. FYI, AMSOIL rates this fluid as "fill for life" for normal service use.
I just changed mine out this weekend. Changeout is very simple once you get the right stuff. I use a $3 oil pump I bought at the local autostore to pump the fluid up into the diff (and I have another one for the tranny fluid).
More info on the AMSOIL product line can be found here:
Independent AMSOIL Dealer
AMSOIL Corporate Homepage
You can find the applicable AMSOIL products for any of your cars here:
AMSOIL Online Product Application Guide
Team Owner
Joined: Sep 1999
Posts: 20,054
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From: Swansea IL
Re: Rear Diff Fluid change - discuss (Chopper Larry)
I used AMSOIL and had some minor posi chatter, so I had to add about an ounce of SLIP-LOCK. Luckily I bought a bottle when I bought all my AMSOIL fluids. I had access to a buddies lift and fluid transfer hand pump. With that set up it took less than 30 minutes to change the tranny and diff fluids. The only difference I noticed was a slight reduction in tranny gear rattle on shut down and I think it feel smoother during shifting but that could have been the plecibo affect of doing a job like this.
Tom
Tom
Safety Car
Joined: Sep 2001
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From: Wilmington NC
Re: Rear Diff Fluid change - discuss (blackjack)
I used the Redline gear oil. It comes with the friction modifier included already.
For all of my cars...
For all of my cars...
Drifting
Joined: Oct 2002
Posts: 1,335
Likes: 76
From: Bedford Va.
Re: Rear Diff Fluid change - discuss (AFVETTE)
i used Amsoil, i waited to see if I had any chatter. It did and then I
added the GM additive. I used a pump that mounted right onto the
quart bottles-a small plastic thing that has a plunger.
added the GM additive. I used a pump that mounted right onto the
quart bottles-a small plastic thing that has a plunger.
Le Mans Master
Joined: Oct 1999
Posts: 8,205
Likes: 40
From: Tucson AZ
Re: Rear Diff Fluid change - discuss (gonbad)
Remember to remove the fill plug FIRST, then the drain plug otherwise when it drains it will slosh all over the garage floor. The old oil is thick, greenish black and smells real bad.
