C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

changing rear end fluid

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Old Aug 26, 2004 | 03:03 PM
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Default changing rear end fluid

does the fluid have to be pumped out of the fill hole on the pumpkin? is it hard to get most of it pumped out?
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Old Aug 26, 2004 | 03:10 PM
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yes, it needs to be pumped out, no it ain't hard! It will take longer to get the car up on jack stands... I ain't kidding.

go to pepboys and buy a Mighty-mite pump. It's about $10~$15, depending, and works like a champ.

Gordon Killebrew recommends using TWO bottles of GM Posi additive.

I am using that, plus enough Valvoline gear oil to bring it up to level.

As a side note, I am most impressed with the Valvoline line of synthetic products... brake fluid, power steering, gear oil, and most recently, engine oil.
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Old Aug 26, 2004 | 03:40 PM
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How many miles should the fluid be changed in the rear end??
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Old Aug 26, 2004 | 04:41 PM
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I think it's every 30k. I try to do it with the transmission fluids.
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Old Aug 26, 2004 | 07:18 PM
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What kind of gear oil exactly do you use? I know you use Valvoline, but I though there was different types of gear oil?
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Old Aug 26, 2004 | 07:30 PM
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Originally Posted by TheStef
What kind of gear oil exactly do you use? I know you use Valvoline, but I though there was different types of gear oil?
According to the service manual, the transaxle fluid does not require changing. SAE 80W or SAE 80W-90 GL-5.

When and if you change it is kind of up to you. Stick a finger in it and look and smell. If it still looks new and doesn't smell bad, it's probably OK..
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Old Aug 26, 2004 | 07:36 PM
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did your 84 manual say that? I will check my 92 manual.
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Old Aug 26, 2004 | 07:38 PM
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Originally Posted by TheStef
What kind of gear oil exactly do you use? I know you use Valvoline, but I though there was different types of gear oil?
I use Redline HD shockproof oil....additives are all ready in it.
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Old Aug 26, 2004 | 07:39 PM
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Originally Posted by bogus
did your 84 manual say that? I will check my 92 manual.
Verbatim from my 86 manual.. Probable has the same diff as an 86.
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Old Aug 26, 2004 | 08:30 PM
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Originally Posted by lefoy84
Stick a finger in it and look and smell. If it still looks new and doesn't smell bad, it's probably OK..
If it doesn't smell bad, it's the wrong lube
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Old Aug 26, 2004 | 08:34 PM
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Originally Posted by xs650
If it doesn't smell bad, it's the wrong lube
Depends on what smells bad to you.
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Old Aug 26, 2004 | 08:36 PM
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Originally Posted by xs650
If it doesn't smell bad, it's the wrong lube

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Old Aug 27, 2004 | 08:24 AM
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Default Change pumpkin lube

Most of us will never change the diff. lube. We should probably change it every 50000 miles. Run the test--- put your finger in and look at the lube. If it is dark brown or black with over 50000 miles, change it. I use Valvoline synthetic gear lube.
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Old Aug 27, 2004 | 09:55 AM
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Originally Posted by lefoy84
the transaxle fluid does not require changing.
The C4 does not have a transaxle.
They have transmissions (gearboxes) and they have rear ends (differentials). Both require periodic lubricant changes.
There was a recent thread on trans lubricants and the testing mentioned in that thread indicates that the lubricant breaks down fairly quickly and should be changed about every 30k miles, as someone has already mentioned.
Changing the rear end lube is more difficult than the trans (no drain plug), but it's not bad...just get a suction pump from NAPA and be ready for some isometrics.

Larry
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Old Aug 27, 2004 | 10:41 AM
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A friend of mine who used to sell used Vettes used a turkey baster to remove the old fluid. He added a hose to the end and just made sure he squeezed before he put the hose in the fluid. Nice and cheap and worked for him.
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Old Aug 27, 2004 | 12:15 PM
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Originally Posted by aj1988
A friend of mine who used to sell used Vettes used a turkey baster to remove the old fluid. He added a hose to the end and just made sure he squeezed before he put the hose in the fluid. Nice and cheap and worked for him.
I think a turkey baster would not have enough suction, Use a suction pump, I bought one from Harbor Frieght for about $6 and some extra hose from home depo.
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