Rear differential leaking
01-22-2013, 06:41 PM
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Car: 1984 Trans Am
Engine: 305
Transmission: 700r4 automatic
Rear differential leaking
hey guys i went and got my car inspected and my rear diff is leaking fluids and im wondering what might be causing that and the easiest way to fix it thank you
01-22-2013, 07:53 PM
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Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: Rear differential leaking
Where is it leaking? Pinion seal? pinion nut/splines? Fill plug? Rear cover gasket? Left or right axle seal ?
01-22-2013, 07:59 PM
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Car: 1984 Trans Am
Engine: 305
Transmission: 700r4 automatic
Re: Rear differential leaking
I dont know all they said it was leaking and i need to fix all i know is that its cover in oil and grease
01-23-2013, 06:53 AM
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Re: Rear differential leaking
First you must find where it is leaking. The procedure for fixing a leak depends on where the leak is. Go find the leak and then come back for an answer.
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01-23-2013, 04:00 PM
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Car: 89 Black IROC-Z convertible
Engine: 305 TBI
Transmission: Auto
01-23-2013, 04:01 PM
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Car: 1985 Pontiac Trans Am
Engine: 305 (5.0L) TPI
Transmission: 700R4
Axle/Gears: 9 Bolt Borg Warner Posi-traction
Re: Rear differential leaking
I would clean the outside of the differential with some degreaser and check it in a couple of days to see where the leak is comming from.
ALSO!! Don't drive that car if it's low on differential oil! You would be wise to go ahead and top off the oil level so your differential doesn't lock up on you when going down the road.
You will total out your car in a ditch or worse.
ALSO!! Don't drive that car if it's low on differential oil! You would be wise to go ahead and top off the oil level so your differential doesn't lock up on you when going down the road.
You will total out your car in a ditch or worse.
01-23-2013, 04:05 PM
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Car: 1984 Trans Am
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Re: Rear differential leaking
ok so the pinion seal and where do you put the oil in on it
01-23-2013, 04:50 PM
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Car: 1985 Pontiac Trans Am
Engine: 305 (5.0L) TPI
Transmission: 700R4
Axle/Gears: 9 Bolt Borg Warner Posi-traction
Re: Rear differential leaking
There should be a rubber fill plug on the differential cover. If not, then there is a fill plug bolt on the housing.
Add oil until it reaches the bottom of the fill hole and starts to run out.
A complete drain and fill is 3.5 pints of GL-5 gear lube (GM oil), SAE 80W or SAE 80W-90.
If you have a limited slip you will need the additive for that.
I did read somewhere on here that if you use synthetic gear oil you don't need the additive.
Add oil until it reaches the bottom of the fill hole and starts to run out.
A complete drain and fill is 3.5 pints of GL-5 gear lube (GM oil), SAE 80W or SAE 80W-90.
If you have a limited slip you will need the additive for that.
I did read somewhere on here that if you use synthetic gear oil you don't need the additive.
Last edited by Rickey_85TA; 01-23-2013 at 04:53 PM.
01-23-2013, 05:01 PM
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Car: 1984 Trans Am
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Transmission: 700r4 automatic
Re: Rear differential leaking
well guess when it warms up here i need to check it out cuz its freezing here
01-23-2013, 05:07 PM
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Re: Rear differential leaking
Looks like the pinion seal to me. Sometimes it's just a bad seal and sometimes it's a bad bearing. Other times it could just be the nut is backed off. When you get the chance to work on it come back and you can go over all of the options.
01-23-2013, 05:13 PM
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Car: 1984 Trans Am
Engine: 305
Transmission: 700r4 automatic
Re: Rear differential leaking
yea wont be till march when the major work. when it gets semi warm ill check it out
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