Leak in rear differential??
Leak in rear differential?? So I just got an oil change and the guy says there's a leak in my rear differential... He says he doesn't know what it could be, any of you have any advice? Its a 98 z28 convertible with 78k on the clock.
Would help to know exactly where it was leaking from....front, rear, axles, etc
https://ls1tech.com/forums/gears-axles/412366-rear-end-faq.html
https://ls1tech.com/forums/gears-axles/412366-rear-end-faq.html
Originally Posted by sweetask1ng
He said it was coming from the rear axle, and then in the notes on the report he said rear differential.
A leak at the pinion seal is very common in the F-body so my guess would be that. It's a PITA to do. But if it's only the gasket, it's an easy fix. Go to installuniversity for instructions.
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Originally Posted by Fibbado
If he said that he doesn't know what it could be don't take it back to him to fix it 
Teching In
Joined: Mar 2008
Posts: 1
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It is not hard to do, if you do decide to do it yourself, on thing that i found with changing my rear dif. fluid and my trannie fluid is...make sure you have a oil siphon pump. You can buy it at almos any auto parts store and it makes life a lot easier! instead of trying to get a bottle or funnel into the fill plug, just use the pump. It made my job a LOT easier. Another note if you do it youself, change your trannie fluid while your down there...i used Royal Purple and noticed a hell of a diffrence. My Firebird is much more quiet and i got a 10 hp gain just by changeing the trannie fluid and the rear diff. Hope this helps
When my 32k stock 10 bolt was removed, there was def a dark spot on top of the housing and near the vent area. Techincally its a leak BUT it wasnt anything critical.
Get under the car and look, feel and see if there is any oily residue,
Get under the car and look, feel and see if there is any oily residue,
