Changing rear end oil....
Pro
Joined: Dec 2002
Posts: 522
Likes: 3
From: Rolling Meadows IL
Re: Changing rear end oil.... (krazy1)
When I first got my Vette I got the GM shop manual. The manual
procedure was to pull the diff. out of the car and remove the cover.
I thought no way did a Chevy dealer do that to change the fluid. I
talked to the mechanic that was the Corvette guy. He laughed. He
showed me the tool he made to make it easy. He took quarter inch
copper tubing bent it into a half circle about six inch radius. The end
result looks like a J with out the top. You connect the tube to a sucker,
snake the tube by the gear and suck it out. This guy was so cool he let
me take it home to do my car. It was a piece of cake.
When I changed the gear ratio I made one. With the cover off you can
see exactly how to bend it to get to the bottom of the case. If someone
can host it I can take a picture of it.
procedure was to pull the diff. out of the car and remove the cover.
I thought no way did a Chevy dealer do that to change the fluid. I
talked to the mechanic that was the Corvette guy. He laughed. He
showed me the tool he made to make it easy. He took quarter inch
copper tubing bent it into a half circle about six inch radius. The end
result looks like a J with out the top. You connect the tube to a sucker,
snake the tube by the gear and suck it out. This guy was so cool he let
me take it home to do my car. It was a piece of cake.
When I changed the gear ratio I made one. With the cover off you can
see exactly how to bend it to get to the bottom of the case. If someone
can host it I can take a picture of it.
Instructor
Joined: Apr 2002
Posts: 132
Likes: 0
From: Dewey Az
Re: Changing rear end oil.... (96CollectorLT4)
My '95 has 67k miles, and I'm sure this has never been done, so I was actually planning on doing it this weekend. But since it sounds like a real pain to get the old stuff out, I was just wondering .... has anybody tried a "Jiffy Lube" or "Oil Can Henry's", and have them put synthetic back in ? Can't be much more than $20, much cleaner and quicker !
Any thoughts ??
Any thoughts ??
Pro
Joined: Dec 2002
Posts: 522
Likes: 3
From: Rolling Meadows IL
Re: Changing rear end oil.... (Wile'sVette)
Well like a good little engineer I never put anything out there that I
haven t tested and know works so I tried to use the tube I made. It
fit nicely on the bench when the differential was out of the car but
doesn t fit with the differential in the car. :banghead:
Let me make one that works then I will send the photos.
haven t tested and know works so I tried to use the tube I made. It
fit nicely on the bench when the differential was out of the car but
doesn t fit with the differential in the car. :banghead:
Let me make one that works then I will send the photos.
Burning Brakes
Joined: Feb 2003
Posts: 1,212
Likes: 0
From: OH
Re: Changing rear end oil.... (dave_85)
changing the rear-end is MESSY and time consuming. Did that last weekend. Took about 3 hours I figure. Used a mitivac to remove the oil. Got about 1 1/2 qts out before I just had enough of the smell. Then used a pump to get it back in.
I don't think I will be repeating taht process again. Next time will find someone else to do the dirty work.
I don't think I will be repeating taht process again. Next time will find someone else to do the dirty work.
Premium Supporting Vendor
Joined: Aug 2001
Posts: 5,364
Likes: 38
From: King George VA
Re: Changing rear end oil.... (BrettWithVette)
so how often do u change the rear end oil??? ive never done it shoudl i??
The AMSOIL SAE 80w-90 is the appropriate oil for the C4 differential.
Here is the complete AMSOIL production application guide:
AMSOIL Online Product Application Guide
[Modified by Subdriver, 6:37 PM 5/21/2004]
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Burning Brakes
Joined: Nov 2000
Posts: 1,012
Likes: 1
From: Bowie MD
Re: Changing rear end oil.... (krazy1)
Its been on order for three weeks now, I guess we are still on the wait and see track. I just spent my last $100 getting new poly bushings for the rear. I am trying to push the buggers out. May have to resort to burning them out as suggested by my redneck neighbor and his propane torch/hammer and chisel approach to everything. :lolg:
Racer
Joined: Oct 2002
Posts: 293
Likes: 0
From: Newnan Ga
Re: Changing rear end oil.... (96CollectorLT4)
A friend of mine who is a corvette restoration guy told me to drill and tap a hole in the bottom of the diff. I picked out a small pipe plug that had an allen head so the head could be nice and flush. I think I got it out of an engine block plug kit. You want to use a pipe tap and plug so the taper of the threads will seal instead of having to had a flat sealing surface. I wouldn't use a straight tap for this. I found a nice flat place on the passenger side that was very near the bottom of the diff to drill my hole. It wasn't a big deal to do. Just be careful to get it right the first time.
Melting Slicks
Joined: Sep 2003
Posts: 3,031
Likes: 74
From: If you don't weigh in you don't wrestle Road America
Re: Changing rear end oil.... (87NassauBlue)
You guys are all a bunch of wimps, just get a long tube suck out the old gear lube and spit it into the pan. :lolg:
I sucked mine out with a pump and got out a little less than 2 quarts. I refilled it with Royal Purple 80w90 and have been pleased with the results, synthetic and you still get two (rather large) black marks behind your car. Proof enough for me.
I sucked mine out with a pump and got out a little less than 2 quarts. I refilled it with Royal Purple 80w90 and have been pleased with the results, synthetic and you still get two (rather large) black marks behind your car. Proof enough for me.
Racer
Joined: Feb 2003
Posts: 437
Likes: 2
From: Georgetown Maine
Re: Changing rear end oil.... (96CollectorLT4)
I used the drain plug kit from http://www.corvetteclinicinc.com and bought it from Corvette Central because it was cheaper, same kit. Refilled with 2 bottles Mobil 1 75w90 gear oil and 2 bottles of GM limited slip fluid. Dana recommends changing the fluid at 75,000 miles with either 80w90 or 80w140 or comparable. Look under tech tips for C4 it talks about this. Gordon Killebrew(The C4 Guru) also is the guy who recommends 2 not 1 bottles of limited slip fluid. :chevy :thumbs: :D :cool:
