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1986 chevy scottsdale auto trans dripping

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Old 04-13-2018, 06:46 PM
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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, 07:23 PM
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Which auto transmission is it with the 5.0? Eg: TH-400 ?
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Old 04-14-2018, 08:38 AM
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This seal?


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Old 04-16-2018, 06:50 PM
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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
Originally Posted by Soft Ride View Post
Which auto transmission is it with the 5.0? Eg: TH-400 ?
Originally Posted by Mike View Post
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 06:51 PM. Reason: Added quote code that the robots omitted
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Old 04-17-2018, 05:57 PM
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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, 07:00 PM
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Originally Posted by BIG NICK View Post
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

Originally Posted by BIG NICK View Post
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 ?

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?

Originally Posted by BIG NICK View Post
still leaks.
Did any kind of warranty come with this work?

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