transmission question
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Navigator
Joined: Feb 2006
Posts: 9
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transmission question
i have a 75 vette 350 auto th400. my car sometimes wont shift into 3rd gear . i changed the modulator valve, but it didnt help. i drained some fluid and put an additive in fo slipping trannys but after that and before i drove it i had the air cleaner off and noticed the ported vacuum wasnt blocked off, so i blocked it off and drove the car and now it shifts fine. i guess i should mention i took it to a local shop and they said they checked the vacuum and it was fine and recommended a rebuild. my question is did the stop slip make it work or blocking off the vacuum? and how could they say the vacuum was good with it not being blocked off? anybody got any ideas? thanks in advance
Drifting
Joined: Jun 2005
Posts: 1,523
Likes: 1
From: grand prairie texas
Originally Posted by 75yelloray
i have a 75 vette 350 auto th400. my car sometimes wont shift into 3rd gear . i changed the modulator valve, but it didnt help. i drained some fluid and put an additive in fo slipping trannys but after that and before i drove it i had the air cleaner off and noticed the ported vacuum wasnt blocked off, so i blocked it off and drove the car and now it shifts fine. i guess i should mention i took it to a local shop and they said they checked the vacuum and it was fine and recommended a rebuild. my question is did the stop slip make it work or blocking off the vacuum? and how could they say the vacuum was good with it not being blocked off? anybody got any ideas? thanks in advance
so far it seem ok! i put about 75 miles on it today with no problem. but i wish i new for sure.
