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Old 02-08-2008, 10:33 AM   #1
Evilpat
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Rear Differential Fluid

I have a 94 vette and I'm going to be changing the transmission fluid, and I'm wondering when the rear differential fluid should be changed? The car has 58,000 miles on it. Also does anyone have estimates on how long the water pump lasts? I 've had no issues that I know of, but I figure I maybe should have it replaced before it does leak and wreck the opti spark.
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Old 02-08-2008, 11:18 AM   #2
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Surprisingly, GM gives no interval for changing diff fluid but there's a write up on C4Guru that shows how to change it.

http://www.c4guru.com/articles/Chang...ntialFluid.pdf

Water pumps can last 70,000 miles or 150,000. The can also crap out after 10,000. If yours is ok you can hook up a drain tube to the weep hole to channel any leaking coolant away from the opti so that when it does give out it won't take the opti with it.

Last edited by jrzvette; 02-08-2008 at 03:05 PM.
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Old 02-08-2008, 12:45 PM   #3
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I'd change it out. It's cheap and quick.
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Old 02-08-2008, 09:51 PM   #4
Vis Croceus
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Quote:
Originally Posted by Evilpat View Post
I have a 94 vette and I'm going to be changing the transmission fluid, and I'm wondering when the rear differential fluid should be changed? The car has 58,000 miles on it. Also does anyone have estimates on how long the water pump lasts? I 've had no issues that I know of, but I figure I maybe should have it replaced before it does leak and wreck the opti spark.
Thanks
I'd change both.

30k is a good interval for diff oil, and a whole lot of LT1 WPs fail in the 60-70k range.

Change any other original fluids, like the PSF, while you're at it.
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Old 02-09-2008, 05:19 AM   #5
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Quote:
Originally Posted by Evilpat View Post
I have a 94 vette and I'm going to be changing the transmission fluid, and I'm wondering when the rear differential fluid should be changed? The car has 58,000 miles on it. Also does anyone have estimates on how long the water pump lasts? I 've had no issues that I know of, but I figure I maybe should have it replaced before it does leak and wreck the opti spark.
Thanks
Change all of the fluids and filters. The brake fluid is probably turning black along with the PS fluid....empty and change both. The differential fluid is also on the black side and needs to be changed with 2 /4oz cans of slip dif fluid...(recommend dealer item although you can get cheaper). Change out the antifreeze (good time for a flush to get crap out of heater core.....rinse twice) and use the green stuff and not the red stuff that eats gaskets....Change fuel filter....filters. Change oil and oil filter to Mobil 1 or similar full sythetic ( I like Castrol myself). Check ac fluid and check system ( replace weak or damaged condensor and hoses if necessary and replace ac fluids. Replace trans fluid and filter and clean out black filings from magnet. Add injector cleaner to tank with 21 gal of fuel and run until empty and do again. Have fun!
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Old 02-09-2008, 07:40 AM   #6
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Quote:
Originally Posted by arizonaames View Post
Change all of the fluids and filters. The brake fluid is probably turning black along with the PS fluid....empty and change both. The differential fluid is also on the black side and needs to be changed with 2 /4oz cans of slip dif fluid...(recommend dealer item although you can get cheaper). Change out the antifreeze (good time for a flush to get crap out of heater core.....rinse twice) and use the green stuff and not the red stuff that eats gaskets....Change fuel filter....filters. Change oil and oil filter to Mobil 1 or similar full sythetic ( I like Castrol myself). Check ac fluid and check system ( replace weak or damaged condensor and hoses if necessary and replace ac fluids. Replace trans fluid and filter and clean out black filings from magnet. Add injector cleaner to tank with 21 gal of fuel and run until empty and do again. Have fun!
I am a firm believer in new fluids, and keeping fluids new. It'll be the life of your vehicle, and save you many dollars in repairs. An ounce of prevention.....

Hey Arizonaames, you live in my hometown! Ever make it South, down the Spars? Great driving country!
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Old 02-09-2008, 09:10 AM   #7
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Quote:
Originally Posted by arizonaames View Post
Change all of the fluids and filters. The brake fluid is probably turning black along with the PS fluid....empty and change both. The differential fluid is also on the black side and needs to be changed with 2 /4oz cans of slip dif fluid...(recommend dealer item although you can get cheaper). Change out the antifreeze (good time for a flush to get crap out of heater core.....rinse twice) and use the green stuff and not the red stuff that eats gaskets....Change fuel filter....filters. Change oil and oil filter to Mobil 1 or similar full sythetic ( I like Castrol myself). Check ac fluid and check system ( replace weak or damaged condensor and hoses if necessary and replace ac fluids. Replace trans fluid and filter and clean out black filings from magnet. Add injector cleaner to tank with 21 gal of fuel and run until empty and do again. Have fun!


One caution, if you or a previous owner changed the antifreeze to DexCool (the red stuff) either continue using it or make sure you get every last drop of it out of your cooling system before replaceing it with green. The two don't mix and you'll wind up with a cooling system full of jello.
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