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Old 12-19-2006, 09:01 AM
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Th375????

Guys, I've have a s-1o with a 350 small block and I thought was a th350. Well, when I went to the local parts store to get a new gasket/filter for the th350 it didn't fit. So I went back and the only gasket that would fit, was for a th375?? I am new to hotrodding/automotive in general and I have never heard of this transmission, are they any good??

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Old 12-19-2006, 09:11 AM
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Another board discussed this

I found something on another board. Sounds like its a TH400 for the most part with a 350 tail shaft?

K
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Old 12-19-2006, 09:24 AM
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Hey, thanks killer.. Okay, now for my last question sorry if it's lenghty.. I have been having problems with my truck moving when I put it into gear. Last weekend I noticed the passenger side rear brake was binding (the piston was shot and had press the shoes against the drum) I removed the brakes and off my truck went. Problem solved... NOPE. Yesterday I jacked the rearend up and put it into gear and nothing.. The driveshaft would not spin at all. I then went to my local parts store to pick up the gasket/filter mentioned above because I wanted to look at the fluid. Well I found many small pieces of the gasket in the bottom of the pan.. NOT good... I'm afraid the some of these particals have worked its way into the trany. Is there anything I can do to try to get any of this stuff out. I have had the pan off since yesterday hoping that some of this would drain out. Please know that I have no smarts when it comes to tranies. Any help you can give me would be great, I"m trying to figure out the little problem solving things I can do be having to drop the trany, thanks again.
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Old 12-19-2006, 09:40 AM
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Quote:
Originally Posted by JJ350
Last weekend I noticed the passenger side rear brake was binding (the piston was shot and had press the shoes against the drum) I removed the brakes and off my truck went. Problem solved... NOPE.

Well I found many small pieces of the gasket in the bottom of the pan.. NOT good... I'm afraid the some of these particals have worked its way into the trany.
Just curious about your first statement. How is removing the brakes solving the problem?

Your second comment however has been answered by yourself. "NOT good". Sounds like you are ready for a complete rebuild /replacement of that trans.

Last edited by Frisco; 12-19-2006 at 04:58 PM. Reason: Removed incorrect info concerning the TH375 trans
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Old 12-19-2006, 09:55 AM
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Frisco, Sorry I didn't mean problem solved ,I just thought at the time the reason why my truck wasn't moving was becuase of the brakes locking up.
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Old 12-19-2006, 10:15 AM
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Quote:
Originally Posted by JJ350
Frisco, Sorry I didn't mean problem solved ,I just thought at the time the reason why my truck wasn't moving was becuase of the brakes locking up.
No apology needed. I just didn't understand your statement.

Good luck with the trans.

If it was just gasket from the pan you may be OK. Was the trans fluid FULL when you tried to move? If the trans was low that could be the problem.
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Old 12-19-2006, 10:18 AM
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Is it possible that the filter will stop the debri in the pan from going into the trans? Or is there other places on the trans that draw the fluid from the pan?
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Old 12-19-2006, 10:19 AM
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Frisco, yes there was plenty of fluid in the trans, I checked it many times.
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Old 12-19-2006, 10:26 AM
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Quote:
Originally Posted by JJ350
Is it possible that the filter will stop the debri in the pan from going into the trans? Or is there other places on the trans that draw the fluid from the pan?
Yes the filter should do the job.

Problem at this point is whether the debris is from the pan gasket or the clutch discs. If it is from the clutch discs; then rebuild/replace is next step. If only from the pan gasket; then a good cleaning of the pan and replacement of the filter as well as re-filling the trans fluid may be all that is required.

When re-filling the trans; pour 4 quarts in the trans. Start the engine and while the engine is idling pour in additional trans fluid until FULL on the trans dipstick. Should take about 4-5 additional quarts unless the trans is a new empty one. Total capacity is around 11-12 quarts including the converter, lines, & trans cooler.
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Old 12-19-2006, 11:03 AM
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Frisco, yes I'm pretty sure the debris is from the gasket. I made a close inspection of the fluid when i drained it and got my hands in there and felt all of the debris and there were no metal flakes of any kind in the fluid. Thanks for all your help. I will put the pan back on tonight and update tomorrow.
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Old 12-19-2006, 12:45 PM
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I can't remember the exact difference, bu the THM375 is different than a THM350. Lock up designation is THM350C.
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Old 12-19-2006, 01:09 PM
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sbchevfreak, I don't know much about tranies but I happen to call a local transmission shop and he said a th375 is a TH400 with a TH350 output shaft..
I don't know if any experts will chime in on this..
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Old 12-19-2006, 02:50 PM
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Quote:
Originally Posted by JJ350
sbchevfreak, I don't know much about tranies but I happen to call a local transmission shop and he said a th375 is a TH400 with a TH350 output shaft..
I don't know if any experts will chime in on this..
a 375 IS a 400 with a small spline (350) tailshaft. dont see too many of those anymore
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Old 12-19-2006, 03:00 PM
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Not wanting to be this thread to death but is the TH400 the same length as the TH350, just wandering why the made a TH375 , thanks.
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Old 12-21-2006, 09:08 AM
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I use to work in a Chevy parts dept in the mid 70's. Basically the TH375 is a light duty version of the TH400. Same basic trans but I think it basically had smaller clutch packs, meaning less clutch plates, ect. IIRC, I seem to recall a TH425 but I could be wrong. Used in heavy duty trucks.
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