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Old 06-18-2003, 05:20 PM
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turbo 350 wont shift

i went to an appointment today transmission shifted fine .
when i got ready to leave i put the car in low gear and pulled out
of the parking lot , i noticed that the transmission would not shift out of low gear .
i was told to check the shift control valve ( i hope thats the right name for it ) and i even changed it .
still did not solve the problem . no matter where i put the shifter the trans. stays in low gear .
thanks for any help you may be able to give me .
stuck in low gear .
joe
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Old 06-18-2003, 05:23 PM
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ohh i forgot to mention this is a chevy th 350 transmission .
has a shift kit in it and a stall converter.
in a 1972 chevy nova .
thanks .
joe
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Old 06-18-2003, 06:22 PM
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I've never heard of a shift control valve on a T-350. I imagine you are talking of the vacuum modulator. MAke sure the vacuum lines are good, no leaks.

Next would be to check the governor gear. need to pry off the round press on steel cover near the rear of the trannys main case. It has a plastic gear on the gov that can wear out or break.

Next would be to check the detent cable to the carb if you have one hooked up. They can melt, stick or break in the WOT position and it tells the tranny you have your engine wide open.
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Old 06-18-2003, 06:46 PM
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That happened to me with my El Camino once (TH 350) ... it was a disconnected vacume line.

Alan
54 Chevy Pickup
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Old 06-18-2003, 07:26 PM
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i believe thats what its called,, the governor gear ,, checked it ,, and also put a different one in ,,no change .
i also checked the cable you mentioned too seemed ok but i am going to look at it a bit closer .
vaccum lines are ok as well .
thank you for your reply , very much appreciated


joe
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Old 06-18-2003, 07:28 PM
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thank you too Alan ,,i checked the vaccum lines at least 3 times and they are ok ,,
joe
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Old 06-18-2003, 09:45 PM
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Quote:
Originally posted by joesnova2
thank you too Alan ,,i checked the vaccum lines at least 3 times and they are ok ,,
joe

====== not to beat a horse but, did you check for vacuum at the modulator??

Sometimes the line will clog up and there is no vacuum signal at the tranny.

If you changed the gov, did you check the valve for free movement?
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Old 06-19-2003, 12:37 AM
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yep ,, checked both of the ones i have and they were working fine ,, and also have checked the vacum hoses from one end to the other .
im going to check the detent cable today and see if it is the problem .
im going to remove it from the transmission and see if it is stuck or broken .
thanks for your suggestion.
joe
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Old 06-19-2003, 04:06 PM
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Did the shift linkage slip?
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Old 06-19-2003, 04:48 PM
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nope , the shift linkage is fine ,, i even tried to shift it at the transmission ,, no go .
i have checked everything that has been suggested and still
the same problen ,,locked in low gear .
i dont know what else to try now as my knoweledge of automatic transmissions is very limited ,,lol.
according to the local transmission shop it should have been the governor gear or the detent cable stuck open .
so it looks like i,ll be pulling the transmission out and replaceing it .
thank you all very much .
joe
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Old 06-19-2003, 05:43 PM
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Joe
To check the detent cable, disconnect it at the carb. Then pull on the cable. It should move a short distance with no resistance, then move somemore with some pressure. That is when it is moving the valve in the valvebody. That will tell you if the cable is good and the valve is moving like it is supposed to. If it is hard to pull at all, the cable is bad. If it gets no resistrance until it won't move anymore, it is likely a problem inside the trans. Either the valve is stuck or is disconnected, or something like that.
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Old 06-19-2003, 09:22 PM
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checked that and it moved with no resistance a short distance then with some pressure it moved a little more , so i guess its working ok .
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Old 06-22-2003, 10:12 AM
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Got 350 turbo that shifts hard

Hi I have a 86 chevy van G20 305 with 350 turbo my question is it shifts late and hard under regular acceleration I have adjusted the kick down cable as i had on my other chevys with turbo s choke open push tab in and pull carb open all the way and then let tab up to set but still shifts hard and dosen't have any kick down at highway speed ???? any help guys
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Old 06-22-2003, 10:36 AM
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I don't know what setup you have, but on mine the kickdown cable (at the accellerator and carb) has a nub on the end of it ... at WOT it's pulled all the way out -- at idle, it sits an inch or two away from the throttle.

When mine wasn't kicking down, I loosened the allen screw on the nub, slid the nub a quarter-inch closer and tightened the allen screw. This way it kicks down sooner.

Today I was punchin' it around town and havin' some fun ... and I think I'm gonna set the nub another eighth-inch closer so it kicks down a bit sooner still!

Alan
54 Chevy Pickup
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Old 06-22-2003, 05:44 PM
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Re: Got 350 turbo that shifts hard

QUOTE]Originally posted by motoxracer
Hi I have a 86 chevy van G20 305 with 350 turbo my question is it shifts late and hard under regular acceleration I have adjusted the kick down cable as i had on my other chevys with turbo s choke open push tab in and pull carb open all the way and then let tab up to set but still shifts hard and dosen't have any kick down at highway speed ???? any help guys [/QUOTE] ::


mine has a plastic snap with a cable that slides thru it on the throttle linkage and the adjustment is a clip that you push ant it lets the cable slid in or out to make it longer or shorter we just used to push the clip down and open the throttle open al the way and then let up on the clip and this set the adjustment.But even at this point my cable has a lot of slack befor the throttle even starts to pull on it ???? if I go the other way and make it tighter won't it make it shift even later and harder






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