ST300 Stuck in Neutral - Pontiac GTO Forum
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post #1 of 7 (permalink) Old 05-20-2016, 10:46 AM Thread Starter
 
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ST300 Stuck in Neutral

Recently took possession of a 67 Lemans.

Previous owner (father-in-law) stated that 15 years ago, when he had it towed to his house, the flatbed had some sort of a metal peg / post under the car, and it supposedly slammed the transmission pan.

From that point on, the car has been stuck in Neutral. Not having a lot of experience with Transmissions, are there any areas (aside from checking for dents on the tranny pan) that I can check?

I haven't climbed under the car yet, but plan on getting under it this weekend to get a lay of the land.

Any suggestions would be appreciated.
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post #2 of 7 (permalink) Old 05-20-2016, 10:52 AM
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Welcome to the forums.

Does the shifter move at all??
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post #3 of 7 (permalink) Old 05-20-2016, 11:18 AM Thread Starter
 
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No. It's a column mounted shiftier, and it won't budge out neutral. I don't want to yank on it too hard. Afraid I might snap the linkage or something else.
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post #4 of 7 (permalink) Old 05-20-2016, 12:14 PM
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The dented pan may be jamming the shift linkage at the valve body. Might be as simple as pulling the pan and pounding the dent out. Test the shifter once the pan is off. Throw a new filer and gasket on refill, and go.
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post #5 of 7 (permalink) Old 05-21-2016, 08:47 AM Thread Starter
 
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Thank you! Having limited experience with transmissions (mainly 700r4's), and practically zero with the ST300, I didn't want to go digging around in there blind.

I will take the pan off and check to see if that is the cause.
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post #6 of 7 (permalink) Old 05-21-2016, 05:09 PM
 
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While taking the pan off/out isn't a bad thing with the unknown history of the trans,
A quick removal of the linkage will allow you to see if the trans is indeed the issue.
With the linkage off and the car jacked/chocked you should be able to manually move the shift lever.
May be bound linkage.

GTO Jr. - A.K.A. SPRINT 6
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post #7 of 7 (permalink) Old 05-28-2016, 08:49 AM Thread Starter
 
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Thank you everyone. The transmission pan was dent free. It turned out that the car has aftermarket exhaust headers, and one of the linkage arms (I'm assuming that's what they are) rubs against the passenger header.
It was rusted against each other. After breaking it free of the headers, I was able to get some movement.
It wasn't I pulled the transmission pan and removed the filter (it looked like it was crooked, pushing into the metal gear the linkage hooks too) that everything started moving again.

Thanks everyone!

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1966 Lemans w/ 1965 GTO 389 Motor
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO Undercarriage, Frame, Transmission and Differential Discussions.

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