350 turbo trans shifts too quick - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-23-2012, 03:41 PM
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350 turbo,shifts out of 1st. too quick

It wont kick down to 1st. unless I manually pull it down.It kicks down to 2nd. ok and stays in 2nd. a long time b4 up shifting.Stopping in traffic it will not go down to 1st. I can bring it down to 1st, then put it in regular drive and it up shifts too quickly.What do you guys think,?? Thanks 35olds
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Old 06-23-2012, 05:44 PM
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Is this an old trans or fresh rebuild?

you need to remove the governor, look at it. Inner valve on the gov can be sticky, plastic gear may be loose or worn. Check vacuum lines to modulator for leaks, cracks.

This is easy check since the round cover pops off sorta easy with hammer and chisel or large screw driver.

Make sure you have room to press - drive the round cover back on before removal.
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Old 06-23-2012, 11:30 PM
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I wrote to this forum in Jan. 2012 with the same problem. Mine was a built 350 turbo by Performance Transmissions.Problem started after approx. 1000 miles.(sorry no speedo-mile counter) Did the following as they suggested. Replace vac. modulator;removed-checked- and cleaned governor; checked all vac. lines; re-adjusted kick-down linkage; re-adjusted shift linkage; all to no avail.Was told problem was probably in the valve body.I didn't want to pull the pan on a guess, so I gave up, and have been shifting alternately manually and automatically, hoping that if something was stuck, sooner or later it would break free and start working. No luck so far after approx.500 miles.All help would be greatly appreciated!
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Old 06-24-2012, 08:22 AM
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350 turbo shifts too quickly

Thanks Crosley and stanjr41,It is a fresh rebuild with shift kit.It was done about 8-10 years ago but just recently got the car on the road.
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Old 06-25-2012, 05:10 AM
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If like crosley said the TV is adjusted correct, the modulator hose and system is functioning, the governor is in proper working then, fluid level is correct...

Did you remove the 1st servo spring and put a solid brass/plastic dowel in it? did you modify the dowel for the correct length? That will deffinitely make 1st unavalible. This comes in the BM transpak shift kit and can be confused with another location.

When a trans starts to go it will give you only 2nd and reverse. I have seen times were the trans was bad but could be manually brought to 1st when at a stop.

Last edited by spinn; 06-25-2012 at 05:33 AM.
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Old 06-25-2012, 05:50 AM
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Not servo , 1-2 accumulator in the valve body. I cant recall. Anyways the spacer that replaced the spring was about 5/8" .
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Old 07-17-2012, 10:13 PM
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350 turbo

Like I said, this is a SUPPOSEDLY new- rebuild to h/p specs for a decent amount of money from a supposedly well reputed trans. builder. I have not went inside the trans. (removed the oil pan) to check for something I know nothing about. IF someone who is knowledgable about the inner workings of this trans will explain what may be wrong and can explain it to me so that I can look further into it, I would pull the pan and right what's wrong. IF this problem can only occur with a worn out part,what does this say about buying something on reputation, out of a magazine?PLEASE- there has to be a transmission specialist out there that reads this site!
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