Filled differential through vent hole?
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From: SE Houston TX
Car: 1986 Iroc-Z
Engine: 355
Transmission: 700R4
Filled differential through vent hole?
So my filler hole was rusted to hell and I ended up putting 2quarts of gear oil through the top vent hole.
The seal that meets the driveshaft is leaking so I figured the car was due for some fluid.
I removed this and added fluid through it

did I mess up? Lol i know it's a little late just figured I'd ask if I'll see any problems.
The seal that meets the driveshaft is leaking so I figured the car was due for some fluid.
I removed this and added fluid through it

did I mess up? Lol i know it's a little late just figured I'd ask if I'll see any problems.
Joined: Oct 2001
Posts: 12,217
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From: Il
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: Filled differential through vent hole?
Im guessing you drained the old fluid 1st ?? How about limited slip additive ? do you need it?
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From: SE Houston TX
Car: 1986 Iroc-Z
Engine: 355
Transmission: 700R4
Re: Filled differential through vent hole?
Don't have a posi so i didn't use any additive. Nope didn't drain it but I know the leak has been around for about 6 months now, so it def needed it.
Joined: Aug 1999
Posts: 19,282
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From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: Filled differential through vent hole?
https://www.thirdgen.org/forums/tran...-10-bolts.html
JamesC
Joined: Aug 1999
Posts: 19,282
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From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
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From: Central Texas
Car: GTA
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Transmission: 700R4
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Joined: Oct 2001
Posts: 12,217
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From: Il
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: Filled differential through vent hole?
Waaaaaaay over filled!!!!!!!!
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From: SE Houston TX
Car: 1986 Iroc-Z
Engine: 355
Transmission: 700R4
Re: Filled differential through vent hole?
Thanks for the reply guys. Yeah I wouldn't doubt it's overfilled.
Should I go ahead and drain some of it or leave it and let it leak out?
I'm assuming ovefilling would add pressure to the seals, but since I already have a seal that's leaking would that still apply?
Should I go ahead and drain some of it or leave it and let it leak out?
I'm assuming ovefilling would add pressure to the seals, but since I already have a seal that's leaking would that still apply?
Joined: Aug 1999
Posts: 19,282
Likes: 103
From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: Filled differential through vent hole?
I'd make an effort to remove the fill plug (which you need to do anyway). If overfilling has occurred, fluid will dribble out to the proper level.
JamesC
JamesC
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