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Old 10-03-17, 10:29PM   #1
Mr.Pontiac
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Default I have a nasty shaft leak from turbo 400

My turbo 400 is shifting better now than ever but over last 2 outings i developed a real nasty tranny leak from shaft coming out for the shifter fork arm. bad enough after 2 days its heading towards my drain. I bought the little seal and tryed it but still leaking really bad. any ideas here. header collector right smack in the road. I am listening and hate leaks!!
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Old 10-03-17, 10:57PM   #2
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Fix It
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Old 10-03-17, 11:01PM   #3
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Just out of curiosity.
What type of motor mounts & trans mount are you using?
Also are you using some type of a torque strap on the front of the engine & connected to the frame?
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Old 10-03-17, 11:50PM   #4
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Does it leak when the switch is no or off ?
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Old 10-04-17, 12:07AM   #5
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Maybe selector shafts has a groove warn in it where the seal contacts it. Also could be a bad seal right out the box.
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Old 10-04-17, 06:54AM   #6
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i believe yes to a groove worn in shaft. now how to fix the problem, area ive never been at.
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Old 10-05-17, 06:54PM   #7
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There is a seal/O ring right there,change it.
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Old 10-05-17, 09:33PM   #8
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What ends up happen is when the shift lever is nutted on and tightened down it puts a burr on the selector shaft and if you don't use a file to remove that burr it will tear up your new seal when you try to install it. Grease up the new seal before installing it.
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Old 10-07-17, 12:59PM   #9
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ok, i pulled seal out this morning, found a few burrs on o.d. 1 small one on the shaft. removed them.Went to Napa seal part no. for all my pontiac buddys was 4912, they do make a special lube for the o.d. of seal that seals up to .007. i bought it all for 20.00$ I am going to let it set for a hr. or so and see what happens.
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Old 10-07-17, 08:33PM   #10
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she is still leaking, 5 drops on the floor!! darn it!!
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Old 10-07-17, 11:38PM   #11
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Rich if I'm understanding your problem you can get a new shifter shaft for like $30 on ebay and other places.
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Old 10-09-17, 12:15AM   #12
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AC Delco 867990 or Sonnax 3851105k. You will be golden

Last edited by thomas flaherty : 10-09-17 at 12:32AM.
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Old 10-09-17, 12:43AM   #13
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That’s nice to know thank you Thomas
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Old 10-09-17, 06:42AM   #14
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never replaced a shifter shaft, don,t even know where to begin????? No problem buying one just need a step by step video on how its done and is that really the problem???
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Old 10-09-17, 12:36PM   #15
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Rich over on a other forum there's a smart Pontiac guy name Cliff Ruggles and he wrote a book about building a turbo 400 that may help. He has a website I don't remember it right now but look it up he knows a lot about Pontiacs/compression ratio/camshafts and even knows a little about Q jets Hope this helps
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