D36 Differential Fluid Change
Thread Starter
Racer
Joined: Jan 2004
Posts: 261
Likes: 0
From: Belgium WI
D36 Differential Fluid Change
My D36 is out of the car right now and I want to change the fluid. Should I remove the batwing cover and drain/inspect and reseal? Is this a pain in the butt to use RTV and get a good seal? Or...should I get one of those drain plug kits and not open cover up?
Any thoughts would help make my decision.
Any thoughts would help make my decision.
Le Mans Master
Joined: Apr 2000
Posts: 6,294
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From: Amateur driver on open course.
Originally Posted by vsocks
My D36 is out of the car right now and I want to change the fluid. Should I remove the batwing cover and drain/inspect and reseal? Is this a pain in the butt to use RTV and get a good seal? Or...should I get one of those drain plug kits and not open cover up?
Any thoughts would help make my decision.
Any thoughts would help make my decision.
If not, removing the bat wing an regaining a good seal is easy enough. Just clean and inspect both surfaces. It should seal nicely with minimal amounts of sealant. No need to gob it on.
Last edited by 95AquaC4; Sep 30, 2004 at 12:50 PM.
Team Owner
Joined: Dec 1999
Posts: 34,873
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From: Lacey WA RVN 68-69
NCM Sinkhole Donor
I never liked the idea of drilling a hole in the housing and threading it to install a drain plug. Just didnt trust somebody else's measuring to tell me where to drill in area that I cannot see into. It's just as easy to use a suction pump to get the fluid out and use the same pump after cleaning to pump in new oil and a bottle of GM additive.
Race Director
Joined: Jun 2004
Posts: 13,939
Likes: 705
From: WI
What tool to use?
"You could just dump it out after removing the hex-headed fill plug?"
I looked at my D36 while rotating the tires and there was a tag labeled "Limited slip fluid only" is this the nut that I can drain and change the fluid with? I do have a hand pump that I can use. Also I noticed a small area of wetness around that area. What tool takes that nut off?
I looked at my D36 while rotating the tires and there was a tag labeled "Limited slip fluid only" is this the nut that I can drain and change the fluid with? I do have a hand pump that I can use. Also I noticed a small area of wetness around that area. What tool takes that nut off?
Le Mans Master
Joined: Apr 2000
Posts: 6,294
Likes: 0
From: Amateur driver on open course.
Originally Posted by vsocks
Yes, that is the plug that you could use to drain and then refill. If I remember right it is a torx head plug, so the right size torx bit would be used.
Good luck.
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Thread Starter
Racer
Joined: Jan 2004
Posts: 261
Likes: 0
From: Belgium WI
I have decided to change the U joints in my driveshaft. Does the C-Beam slide out above the parking brake cables? Also, when you pull the driveshaft out of the tranny tailshaft is anything suppose to leak out?
Drifting
Joined: Apr 2003
Posts: 1,292
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A bit of fluid leaks out, not much- 1/2 cup maybe??
Dont need to slide c-beam out, maybe push it out of the way a bit.
I would take the batwing off the diff.(since it is out of the car already). Then you can drain the oil and wipe out all the gunge inside with paper towels. Seals easy with a bit of silicone goo.
Dont need to slide c-beam out, maybe push it out of the way a bit.
I would take the batwing off the diff.(since it is out of the car already). Then you can drain the oil and wipe out all the gunge inside with paper towels. Seals easy with a bit of silicone goo.
Le Mans Master
Joined: Apr 2000
Posts: 6,294
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From: Amateur driver on open course.
Originally Posted by vsocks
I have decided to change the U joints in my driveshaft. Does the C-Beam slide out above the parking brake cables? Also, when you pull the driveshaft out of the tranny tailshaft is anything suppose to leak out?
Make certain to support the engine/tranny if removing the c-beam. If your not removing the c-beam, then support IT, as there is no crossmember in our cars. This is a mistake I made, and with my camber brace the engine moved enough to snap my ect sensor leads off. Supporting the c-beam on the brake cable is too far. It will need to be supported higher than the cables. good luck.
Team Owner
Joined: Jul 2004
Posts: 28,366
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From: Hartford WI
What fluid to use? I know you need some additive but what lubricant? Book says 80W90 but some people say 75W90 and some even say 75W140,
https://www.corvetteforum.com/techti...D=48&TopicID=2 says Gear oil should have a GL-5 rating and a 75w-140 or 75w-90 weight, with 75w-140 being the preferred weight.
Why would you use 75W140?
https://www.corvetteforum.com/techti...D=48&TopicID=2 says Gear oil should have a GL-5 rating and a 75w-140 or 75w-90 weight, with 75w-140 being the preferred weight.
Why would you use 75W140?
Last edited by aklim; Oct 1, 2004 at 06:25 PM.
Thread Starter
Racer
Joined: Jan 2004
Posts: 261
Likes: 0
From: Belgium WI
Is any kind of thread sealant used on the fill plug? When I removed it on ine there appeared to be a small trace of something. I don't want to use teflon tape or anything if not recommended.
Thread Starter
Racer
Joined: Jan 2004
Posts: 261
Likes: 0
From: Belgium WI
So ther fill plug uses no sealer I assume. Anyone know how much fluid is recommended? I know that 2 bottles (4. oz each) of positraction additive are recommended. I think the gear lube bottles are 23 oz.
Is 4 pints correct, and does that include the additive or not?
Is 4 pints correct, and does that include the additive or not?
Last edited by vsocks; Oct 4, 2004 at 08:03 PM.
Le Mans Master
Joined: Apr 2000
Posts: 6,294
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From: Amateur driver on open course.
Originally Posted by vsocks
So ther fill plug uses no sealer I assume. Anyone know how much fluid is recommended? I know that 2 bottles (4. oz each) of positraction additive are recommended. I think the gear lube bottles are 23 oz.
Is 4 pints correct, and does that include the additive or not?
Is 4 pints correct, and does that include the additive or not?
