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  #16 (permalink)  
Old 12-21-2006, 05:18 PM
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Quote:
Originally Posted by Huskinhano
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.

the t425 is a FWD unit used in the large cars.

T-475 was used in large motor homes.

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  #17 (permalink)  
Old 12-21-2006, 05:21 PM
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Quote:
Originally Posted by JJ350
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.

t-400 is not same length as a t-350. Trans mount in a different location , different spline output shaft diameter in most t-400


why did GM build the t-375 tranny? You would have to ask GM engineers that.

they possibly saved 1.75 per tranny/car on it
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Old 12-22-2006, 04:51 PM
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Quote:
Originally Posted by Crosley
t-400 is not same length as a t-350. Trans mount in a different location , different spline output shaft diameter in most t-400


why did GM build the t-375 tranny? You would have to ask GM engineers that.

they possibly saved 1.75 per tranny/car on it
trans mount on a turbo 400 is 5 inches far forward than a 350, they also made a 375b trans, but it is the heaviest duty of the turbo 350s according to the hydra-matic turbo 350 handbook by ron sessions
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Old 12-22-2006, 05:33 PM
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Quote:
Originally Posted by runn141
trans mount on a turbo 400 is 5 inches far forward than a 350, they also made a 375b trans, but it is the heaviest duty of the turbo 350s according to the hydra-matic turbo 350 handbook by ron sessions

that is really wonderful information..... the 375b unit is seldom talked about or heard of by most folks.


I would re-read the mount location information between a t-400 & the t-350 tranny.... or I do not understand what you mean by;

"trans mount on a turbo 400 is 5 inches far forward than a 350"




carry on.
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Last edited by Crosley; 12-29-2006 at 08:45 PM. Reason: used the wrong words... again
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Old 12-22-2006, 06:25 PM
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Quote:
Originally Posted by Crosley
that is really wonder information..... the 375b unit is seldom talked about or heard of by most folks.


I would re-read the mount location information between a t-400 & the t-350 tranny.... or I do not understand what you mean by;

"trans mount on a turbo 400 is 5 inches far forward than a 350"




carry on.
sorry about that what i mean is if you have a 350 turbo in a car and you put a 400 turbo in, the location where the 350 crossmember mount was will have to be moved 5inches forward or maybe a little less
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Old 12-29-2006, 08:16 PM
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Not trying to hijack this, but I have a 350 lockup BOP behind a Poncho engine. Are they very strong, or is the lockup a bad idea for a moderate engine? Never a problem yet.
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  #22 (permalink)  
Old 12-29-2006, 08:46 PM
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Quote:
Originally Posted by runn141
sorry about that what i mean is if you have a 350 turbo in a car and you put a 400 turbo in, the location where the 350 crossmember mount was will have to be moved 5inches forward or maybe a little less
The t-400 mount area is further back than the t-350 tranny . The cross member would need to move towards the rear of the vehicle.
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