1986 chevy scottsdale auto trans dripping - GM Forum - Buick, Cadillac, Olds, GMC & Pontiac chat


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Old 04-13-2018, 05:46 PM   #1  
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Default 1986 chevy scottsdale auto trans dripping

My transmission was worked on to stop dripping when I parked it wrong. They plugged up a breather hole in yoke but that didn't work, still leaks. Not the end seal on trans but I need a rubber ring that goes around the yoke shaft.I think. Do you have a picture of this so I can take it to parts house and show them what I need. Do yall have another Idea? Thanks, Big Nick
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Old 04-13-2018, 06:23 PM   #2  
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Which auto transmission is it with the 5.0? Eg: TH-400 ?
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Old 04-14-2018, 07:38 AM   #3  
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This seal?


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Old 04-16-2018, 05:50 PM   #4  
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Originally Posted by BIG NICK View Post
My transmission was worked on to stop dripping when I parked it wrong. They plugged up a breather hole in yoke but that didn't work, still leaks. Not the end seal on trans but I need a rubber ring that goes around the yoke shaft.I think. Do you have a picture of this so I can take it to parts house and show them what I need. Do yall have another Idea? Thanks, Big Nick
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Which auto transmission is it with the 5.0? Eg: TH-400 ?
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This seal?
Looks like we need to know the type of transmission that you have. With it being a 1986MY and a stock 305 we can guess that it is likely a THM700-R4 .

Is this correct?

Does it have 2WD or 4WD ?

Can you get us a picture of the leak and related parts?

Last edited by CathedralCub; 04-16-2018 at 05:51 PM. Reason: Added quote code that the robots omitted
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Old 04-17-2018, 04:57 PM   #5  
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stock 2 wd. I think its 400. does that have the corner cut of pan seal ?
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Old 04-17-2018, 06:00 PM   #6  
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stock 2 wd. I think its 400. does that have the corner cut of pan seal ?
I can't say I know of any vehicle that came stock with a 305 and a THM400. 305'* usually came with a THM350 or 700-R4 in automatic pickups. Your description sounds like a THM350. Check this out and then we can be sure:

https://goo.gl/images/xCoKBn

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My transmission was worked on to stop dripping when I parked it wrong.
Does [parking it wrong] mean parking front-of-car uphill? . . . or downhill? . . . or ?

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Originally Posted by BIG NICK View Post
They plugged up a breather hole in yoke but that didn't work, still leaks.
Who did the work?

Do you have a written description of the the diagnosis and the work done?

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still leaks.
Did any kind of warranty come with this work?

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Originally Posted by CathedralCub View Post
Can you get us a picture of the leak and related parts?
. . . ?
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