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Tranny leak into TQ cover

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Old Feb 1, 2010 | 03:26 PM
  #1  
kozman's Avatar
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Car: 89 Trans Am
Engine: 5.0 TPI
Transmission: 700R4
Axle/Gears: 2.73 Posi
Tranny leak into TQ cover

I noticed a few drops under my car just below the TQ plastic dust cover. I crawled under the car, took off the cover and noticed pooling in the bottom of the cover.

I took a look around really didn't notice much, checked in front of TQ towards the engine and it look dry. I looked at the rear of the TQ and it looked a little wet between the TQ and the flexplate(the big gear looking thing with teeth). I checked along the passenger side of the TQ up toward the top of engine and that is the most damp.

Is there something on the passenger side TQ that can cause a leak. I'm guessing the leak is between the TQ and pan.

BTW, the pan looks clean, maybe a seepage on DS front corner.

Please advise as I'm not familiar with trannys
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Old Feb 1, 2010 | 03:44 PM
  #2  
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From: louisville, co
Car: 86 T/A
Engine: 383
Transmission: 700R4
Axle/Gears: 3.27 9 bolt
Re: Tranny leak into TQ cover

My guess would be the rear main seal.
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Old Feb 1, 2010 | 03:51 PM
  #3  
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From: Fairhope, AL
Car: 89RS(other cars & pics in vBgarage)
Engine: LO3, 305 TBI Mildly Modified
Transmission: BakerBuilt 700R4 w/B&M Megashifter
Axle/Gears: 3.23 Auburn Pro Series LSD
Re: Tranny leak into TQ cover

if its tranny fluid leaking than its the input seal probably but im not sure what you are talking about, are you talking about the torque converter when you say TQ
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Old Feb 1, 2010 | 04:18 PM
  #4  
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Car: 89 Trans Am
Engine: 5.0 TPI
Transmission: 700R4
Axle/Gears: 2.73 Posi
Re: Tranny leak into TQ cover

Sorry, I mean TC(torque converter) and it is tranny fluid leaking.

and if it is the input seal or rear main seal(are they the same), where do I look to I see.
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Old Feb 1, 2010 | 04:38 PM
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Re: Tranny leak into TQ cover

There different. The input seal is the seal behind the TC and flexplate at the front of the transmission. The rear main seal is on the rear of the engine crankshaft. If its motor oil then it your rear main, if its transmission fluid then its a good bet its your input seal, which you said its tranny fluid so... some one else might chime in and think of something else tho...
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Old Feb 1, 2010 | 04:40 PM
  #6  
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From: Fairhope, AL
Car: 89RS(other cars & pics in vBgarage)
Engine: LO3, 305 TBI Mildly Modified
Transmission: BakerBuilt 700R4 w/B&M Megashifter
Axle/Gears: 3.23 Auburn Pro Series LSD
Re: Tranny leak into TQ cover

it would have to be the input seal or the very front of the pan
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Old Feb 1, 2010 | 05:54 PM
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Car: 1987 Black IROC-Z (SOLD)
Re: Tranny leak into TQ cover

Front input shaft seal leaking down to the cover. The tranny has to be dropped for this repair.
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Old Feb 1, 2010 | 06:07 PM
  #8  
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Car: 89 Trans Am
Engine: 5.0 TPI
Transmission: 700R4
Axle/Gears: 2.73 Posi
Re: Tranny leak into TQ cover

thanks for the good news LOL, this job is out of my skill set, what is average repair cost for this? , 300-500 bills
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Old Feb 1, 2010 | 07:17 PM
  #9  
89RS_82Z's Avatar
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From: Fairhope, AL
Car: 89RS(other cars & pics in vBgarage)
Engine: LO3, 305 TBI Mildly Modified
Transmission: BakerBuilt 700R4 w/B&M Megashifter
Axle/Gears: 3.23 Auburn Pro Series LSD
Re: Tranny leak into TQ cover

Originally Posted by kozman
thanks for the good news LOL, this job is out of my skill set, what is average repair cost for this? , 300-500 bills

i have no idea...... i pull my trans and all myself, its not that hard, i can pull mine in a hour on jack stands

not to cheap i would think, try a thing of lucas trans fix it may get you by (or bars leak for trans)
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Old Feb 1, 2010 | 08:15 PM
  #10  
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Re: Tranny leak into TQ cover

If you have a decent set of tools I would try it myself. Might even consider buying a cheapo set if you don't already have any tools. I don't know much about transmissions but I don't believe its that hard of a job. I would atleast search it on the net and find out the steps involved in replacing the seal,see if it something you can figure out. How alot of people end up learning to work on their cars, lol, don't want to spend or can't afford to spend the money. Next thing you know your taking on all kinds of jobs....good luck either way.
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Old Feb 1, 2010 | 08:23 PM
  #11  
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Car: 89 Trans Am
Engine: 5.0 TPI
Transmission: 700R4
Axle/Gears: 2.73 Posi
Re: Tranny leak into TQ cover

I have a decent set of tools, ramps and jacks but never touched a tranny. I just don't want to start something and really F it up.

If anyone has a how to guide on changing the seal, I will give it a read and see if i can handle the job.

Thanks for the input guys
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Old Feb 1, 2010 | 08:38 PM
  #12  
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From: Spokane WA
Car: 92 Lingenfelter Z28 articwhite
Engine: Aluminum 615BBC
Transmission: Th400wbrake/curri entps9" locker
Axle/Gears: 4.11/4.30/4.56
Re: Tranny leak into TQ cover

call a few tranny shops.. that tranny is a 8 min rip out and on the stand. in under 10 min.

most of the time a good shop will ding you for $150 tops (front seal)
any more.. and there just taking you for a ride.

A short rip is a 70 chevy car th350 is a 7 min rip.. thats my best time
worked for AAMCO when i was a Kid..

(this is letting all the bolts just hit the floor) i would sweep them up after...
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Old Feb 1, 2010 | 08:40 PM
  #13  
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From: Pennslyvania
Car: 1984 camaro Z28
Engine: 355 SBC
Transmission: 700 r-4
Axle/Gears: Strange 3:73 posi
Re: Tranny leak into TQ cover

if it's your tranny there isn't much to mess up just make sure you lube up the new seal and make sure the converter ingages all the way it will be 2 clunks besides that just don't drop it on your head and your fine .changing the seal itself takes 10 minutes getting the tranny out since you say you have never done it about 2hours or so just remember where everything goes. good luck and make sure you get the car high enough off the ground so you can get the converter off and out of the way.
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Old Feb 1, 2010 | 08:48 PM
  #14  
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Car: 89 Trans Am
Engine: 5.0 TPI
Transmission: 700R4
Axle/Gears: 2.73 Posi
Re: Tranny leak into TQ cover

I'll try and do more research, I have a Haynes manual but that's very thin on detail. I have time since the car is not driven in the winter, I'll take a peek underneath this weekend to see what is involved.
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Old Feb 2, 2010 | 05:53 AM
  #15  
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Car: 1987 Black IROC-Z (SOLD)
Re: Tranny leak into TQ cover

Originally Posted by kozman
thanks for the good news LOL, this job is out of my skill set, what is average repair cost for this? , 300-500 bills
If it is the upper seal and you go to a honest tranny shop, about $350.
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Old Feb 3, 2010 | 09:54 PM
  #16  
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From: utah
Car: 1986 iroc-z
Engine: lt1 intake 406
Transmission: 700r4
Axle/Gears: stock 89 gta 10 bolt 3.42 non posi
Re: Tranny leak into TQ cover

the upper seal?
there is only one imput seal in the trans
and 350 is a rip off
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