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Rear Main Oil Seal Replacement ?

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Old May 12, 2017 | 09:26 PM
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Out-Cast's Avatar
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From: Eastern Canada NS
Car: 1987 IROC z
Engine: 350 TPI
Transmission: 700R
Axle/Gears: POSI 3:27s
Rear Main Oil Seal Replacement ?

Car is a 1987 with the 350 TPI. I have access to a hoist and a Buddy with a transmission stand to help remove the transmission.
Both of us very mechanically inclined. Looking for any tips to make the job go smooth and no headaches ?
I want to replace all seals and fluids involved in the job. So next question is does Anyone Have the part numbers for the Rear main seal and oil
Pan gaskets etc for OEM replacements if they are available or I would think these should be available at Napa? Is there a transmission filter in these?
I work away so just like to order the all parts that are or may be needed while I am away and be able to get it done quick and not loose any driving time.

Thanks

Last edited by Out-Cast; May 12, 2017 at 09:30 PM.
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Old May 12, 2017 | 09:32 PM
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GeneralDisorder's Avatar
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From: Portland, OR
Car: 86 Imponte Ruiner 450GT, 91 Formula
Engine: 350 Vortec, FIRST TPI, 325 RWHP
Transmission: 700R4 3000 stall.
Axle/Gears: 9 Bolt Torsen 3.70
Re: Rear Main Oil Seal Replacement ?

You don't want OEM on the pan gasket at least. Fel Pro and others make one peice reusable gaskets out of silicone.

There are much better options than OEM in this particular category. Others will have more suggestions I'm sure.

GD
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Old May 12, 2017 | 09:36 PM
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Out-Cast's Avatar
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From: Eastern Canada NS
Car: 1987 IROC z
Engine: 350 TPI
Transmission: 700R
Axle/Gears: POSI 3:27s
Re: Rear Main Oil Seal Replacement ?

Thanks for that advice. With that type of gasket do I have to use some silicone sealant as well as the gasket or not needed?
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Old May 12, 2017 | 09:49 PM
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GeneralDisorder's Avatar
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From: Portland, OR
Car: 86 Imponte Ruiner 450GT, 91 Formula
Engine: 350 Vortec, FIRST TPI, 325 RWHP
Transmission: 700R4 3000 stall.
Axle/Gears: 9 Bolt Torsen 3.70
Re: Rear Main Oil Seal Replacement ?

No they are generally installed dry. They incorporate crush sleeves and come with longer bolts where necessary as well as some neat little plastic threaded studs that hold the pan in place so you can install the bolts, etc.

GD
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Old May 17, 2017 | 01:52 PM
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
You don't have to drop the pan to replace the rear main seal.

These aren't known to be leakers like the old 2-piece rear mains were. Are you sure that's where the leak is coming from? The distributor, intake, and oil pressure sender are more likely. As is the oil pan, for that matter.
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Old May 17, 2017 | 07:59 PM
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Out-Cast's Avatar
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From: Eastern Canada NS
Car: 1987 IROC z
Engine: 350 TPI
Transmission: 700R
Axle/Gears: POSI 3:27s
Re: Rear Main Oil Seal Replacement ?

I'll be checking everything over hopefully this weekend on the hoist but from being under the car in the garage it really looks like it's coming from the seal.
I replaced the oil pressure sensor last ward
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Old May 17, 2017 | 08:16 PM
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Re: Rear Main Oil Seal Replacement ?

You might want to do yourself a favour and give the engine a thorough cleaning. If you can spray the engine (Gunk Engine Brite at Canadian Tire works well) while it's on the hoist, so much the better. Then let it run for an hour or so. You may save a lot of time and effort.
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Old May 17, 2017 | 08:20 PM
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From: Eastern Canada NS
Car: 1987 IROC z
Engine: 350 TPI
Transmission: 700R
Axle/Gears: POSI 3:27s
Re: Rear Main Oil Seal Replacement ?

Yup I'll do that for sure. I have 2 cans sitting on the shelf in the garage.
Thanks for the tip!
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