Need help identifying transmission part
Thread Starter
Senior Member

Joined: Feb 2010
Posts: 695
Likes: 11
From: Oregon
Car: 1991 Z28
Engine: L31-R 350 w/ EBL P4
Transmission: 700R4
Axle/Gears: 2.73
Need help identifying transmission part
This circular part on my transmission has been dripping fluid for about a year now. What part is it?
Thread Starter
Senior Member

Joined: Feb 2010
Posts: 695
Likes: 11
From: Oregon
Car: 1991 Z28
Engine: L31-R 350 w/ EBL P4
Transmission: 700R4
Axle/Gears: 2.73
Re: Need help identifying transmission part
Thanks! Ouch at $82 for a replacement at Advanced Auto. Do you know if there is a fix for a leak on this part without buying a new part?
Last edited by Dartht33bagger; Jul 16, 2017 at 07:57 PM.
Joined: Jul 2011
Posts: 744
Likes: 5
From: Davison, MI
Car: 89 Camaro
Engine: Dart SHP 400-Holley Terminator EFI
Transmission: Tremec T56 Magnum F
Axle/Gears: Strange S60 3.55:1
Re: Need help identifying transmission part
Can't you just buy a new seal, or is it leaking through the body or electrical connection?
Supreme Member




Joined: Oct 2004
Posts: 4,528
Likes: 240
From: Henrietta NY
Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: Need help identifying transmission part
There is an O ring on the body replace that
Thread Starter
Senior Member

Joined: Feb 2010
Posts: 695
Likes: 11
From: Oregon
Car: 1991 Z28
Engine: L31-R 350 w/ EBL P4
Transmission: 700R4
Axle/Gears: 2.73
Re: Need help identifying transmission part
I think it may be leaking out of the body itself but I will start with the O-Ring.
Re: Need help identifying transmission part
If you need to replace it, call Teal Automotive and ask for Sheryl, and tell her I sent you and she will give you the part at my cost. 765 768-7726 EST in Dunkirk, Indiana.
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Joined: Jul 2000
Posts: 6,530
Likes: 94
From: Aridzona
Car: `86 SS / `87 SS
Engine: L69 w/ TPI on top / 305 4bbl
Transmission: `95 T56 \ `88 200-4R
Re: Need help identifying transmission part
That is some nice clean aluminum . What have you been cleaning the aluminum with?
Thread Starter
Senior Member

Joined: Feb 2010
Posts: 695
Likes: 11
From: Oregon
Car: 1991 Z28
Engine: L31-R 350 w/ EBL P4
Transmission: 700R4
Axle/Gears: 2.73
Re: Need help identifying transmission part
I've never touched it. The transmission shop that rebuilt it may have cleaned it off but it wasn't that dirty to begin with somehow.
I'm going to take a shot at replacing the oring this weekend. Will a parts store have the oring in stock or should I be looking for it online? An online search hasn't turned up a whole lot so far.
I'm going to take a shot at replacing the oring this weekend. Will a parts store have the oring in stock or should I be looking for it online? An online search hasn't turned up a whole lot so far.
Joined: Mar 2017
Posts: 4,255
Likes: 427
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: Need help identifying transmission part
Thread Starter
Senior Member

Joined: Feb 2010
Posts: 695
Likes: 11
From: Oregon
Car: 1991 Z28
Engine: L31-R 350 w/ EBL P4
Transmission: 700R4
Axle/Gears: 2.73
Re: Need help identifying transmission part
Edit: Never mind I cracked and decided that the time I would waste calling around town hoping to get lucky wouldn't be worth just spending the $17. Thanks for the link!
Last edited by Dartht33bagger; Aug 3, 2017 at 11:35 AM.
Thread Starter
Senior Member

Joined: Feb 2010
Posts: 695
Likes: 11
From: Oregon
Car: 1991 Z28
Engine: L31-R 350 w/ EBL P4
Transmission: 700R4
Axle/Gears: 2.73
Re: Need help identifying transmission part
I installed the new oring and I still have the leak. It's hard to find the source of the leak but I think it's leaking from the sensor body itself.
Joined: Jul 2011
Posts: 744
Likes: 5
From: Davison, MI
Car: 89 Camaro
Engine: Dart SHP 400-Holley Terminator EFI
Transmission: Tremec T56 Magnum F
Axle/Gears: Strange S60 3.55:1
Re: Need help identifying transmission part
If you have to buy a sensor from Advance, buy it online with their 30% or 40% off coupon and just pick it up in store. It's been awhile since I've used those codes, but the 40% may require $100 purchase. Just Google search the discount codes, but I think they were TRT30 and TRT40 if they still work.








