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Old 02-06-2010, 01:06 AM
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th375 shift problem.

OK heres what happens.
When in D(rive) tranny just stays in 3rd.
BUT if I manually shift say from 1st to 2nd then Drive it works fine.
I WOT it when in 1st and it goes like hell no slip or anything and it shifts really good when I put it up in 2nd and D. So what is going on here? Dont know much about these Automagic trannys so help would be greatly appreciated.
Yes 375 is same as the 400 just a different tail shaft could be wrong though would like some info on the 375 cause Ive heard theres a different number of clutches between the 375 and 400 dunno if thats true. Why do I get the oddball tranny w/ an oddball problem lol.

EDIT: Had to change something cause I was out driving and noticed it was staying in 3rd. Was not paying attention last night, as I was tired from work and wasnt counting shifts.

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Last edited by HDThunder; 02-06-2010 at 09:04 AM.
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Old 02-06-2010, 03:45 AM
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...and one more thing I did notice is that when I do shift it down into 1st it seems like its in neutral, engine has no load on it, but when i hammer on the pedal it grabs and goes. What is this i know its gotta be something simple
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Old 02-06-2010, 06:27 AM
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HDThunder;

welcome to Hot Rodders.

I edited the thread title , We do not use PLEASE HELP here. The folks on the site are very helpful all the time.

What is the mileage , age or service history of this trans ? If you know

How well does reverse function? Does it hold good or not?

With no engine braking in manual low gear on the shifter, it appears the rear band is not holding like it should.

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Old 02-06-2010, 07:30 AM
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Well reverse seems good had it up to about 15 mph and it held with out the feeling of being in neutral.
As far as mileage thats unknown by me but it has had a recent rebuild according to the shop I bought it from and they dont know mileage either.
Has a B&M shift kit and a brand new converter thats about all I know for sure.
Fluid looks pretty and red no burnt smell and is full. Gonna change out the modulator and see if that works.
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Old 02-06-2010, 06:21 PM
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TH375 History copied from 442.com

There are two TH-375s: the TH-375 or TH-375A, and the TH-375B. The TH-375A is the more common, medium duty version of the TH-400. The TH-375B is a less common, heavy duty version of the TH-350. Used in certain full size Buicks in the mid 70's.
A longshaft TH-375A is like a longshaft TH-400, but it uses the smaller diameter yoke from the TH-350. Pan shape is that of the TH-400. The only difference is the output shaft and the tailshaft housing. The TH-375A has the guts of a TH-400 with the output shaft of a TH-350. It was used in full size cars, and it effectively shortened the drive shaft. The TH-375A is also often swapped into big cars as a direct replacement for dead longshaft TH-350s.
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Old 02-10-2010, 01:54 AM
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Quote:
Originally Posted by SSedan64
The TH-375A is also often swapped into big cars as a direct replacement for dead longshaft TH-350s.
Which is exactly what I did, but I did have to shorten the drive shaft a few inches and relocate the crossmember towards the back. All in all it was an easy job.

But now its shifting fine didnt do anything but drive it. Still worried it might come back. Something just got stuck or what I dont know. Damn gremlins wreaking havoc. Makes me think of something my dad said once "Dont worry its a Chevy it will fix it self."
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