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Rear Diff Fluid Change

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Old 01-27-2008, 07:16 PM
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Default Rear Diff Fluid Change

Now i know theres a good writeup on here called "4th gen ube changes" or something like that, but I just was wondering how risky/hard the rear fluid change is? Some local guys have told me it only takes one bad diff fluid change to blow this crappy ten bolt, so I want to be careful. Thanks for any info in advance fellas.
Old 01-27-2008, 08:02 PM
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bump for me wanting to know!
Old 01-27-2008, 08:25 PM
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I would like to know too... Thanks
Old 01-27-2008, 10:10 PM
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Still on stock 10 bolt w/ 4.10 gear and a TA girdle cover.
Change fluid once a year w/ synthetic 85w140, a bottle of GM rear diff additive. Knock on wood....still holding up on spray w/MT 325/50 drag radials.
Old 01-27-2008, 10:51 PM
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I would also like to know...
Old 01-27-2008, 10:58 PM
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im still on my stock 10 bolt! i changed to royal purple 75-90 when i bought my car, i have a torsen so no need for the additive plus the royal purple already has the additive in it! i have drove about 5,000 miles on the fluid and went to the track once! i will change my fluid probably in about 3,000 more miles!
Old 01-28-2008, 06:38 AM
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Theres this... https://ls1tech.com/forums/gears-axles/842421-posi-does-my-car-have-what-oil.html
Old 01-28-2008, 10:11 AM
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The fluid change is easy.

Put a large drip bucket under the rear and remove the 10 bolts from the cover. clean the old gasket material from the housing and cover using a gasket remover or plastic scraper.

Clean the inside of the cover well removing any metal savings from the magnet.

Put a new gasket on and bolt it up - preferrably using a torque wrench.

Remove the filler plug using a square 3/8s socket wrench.

Put the additive in first. Then fill to the top of the filler plug with gear oil. You can use a plunger device for the re-fill which seems easiest. These fillers are sold at parts stores.

Replace the plug and that is it.

I do mine about every 20K.
Old 01-28-2008, 08:27 PM
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Originally Posted by robertbartsch
The fluid change is easy.

Put a large drip bucket under the rear and remove the 10 bolts from the cover. clean the old gasket material from the housing and cover using a gasket remover or plastic scraper.

Clean the inside of the cover well removing any metal savings from the magnet.

Put a new gasket on and bolt it up - preferrably using a torque wrench.

Remove the filler plug using a square 3/8s socket wrench.

Put the additive in first. Then fill to the top of the filler plug with gear oil. You can use a plunger device for the re-fill which seems easiest. These fillers are sold at parts stores.

Replace the plug and that is it.

I do mine about every 20K.
Agreed with the exception of:

You can use silicone instead of gasket.
I recommend change every 10K

Jeff
Old 02-08-2008, 12:04 PM
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Here's the write up.

http://www.bfranker.badz28.com/fbody/lubeoil.htm
Old 04-17-2008, 08:39 PM
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did diff fluid, ATF, and clutch reservoir yesterday.
all very easy. excellent write up.

clutch res was almost empty and all black sludge. no wonder it shifted like crap! all better.
Old 04-18-2008, 09:56 AM
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Glad I could help you out Matt.



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