I've posted this before with no luck, let's try again.

I have the following # on the pad above the pan on the driver's side of my TH400 from my '69 SS.

H0T07053

I was reading a service bulletin about warranty replacement blocks and trannys and I interpreted this:

H - Hydramatic
0 - ?? ( perhaps the year, 1970 )
T - Tonawanda
07053 - Sequential production # ( I hope ?? )

Anybody have any insight?

My car has a warranty replacement block as well, and I just wonder if the motor and tranny got scrambled at the same time, with the tranny being a warranty replacement as well.

Any/all help is appreciated.

Dan

ttt

According to a service bulletin I have for engines/trans dated April 14, 1969 coding for a warranty trans would be as follows:

C ~ Chevrolet (L-Olds, K-Cadillac, B-Buick, & P-Pontiac)
T ~ Trans (E-Engine)
0 ~ example single digit for year
Last 5 digits represent the plant such as
00001 - 19999 for Flint (L-6 engine)
20000 - 49999 for Flint (V-8 engine)
50000 - 79999 for Tonawanda

It goes on to state, "...all Hydra-Matic transmissions are coded "H" reagardless of division produced for." So your decoding seems logical to a point. The plant mfg isn't specified as in your "T" code and sequence number should start with 50000...but who's to say this was actually followed? Deviation seemed to be the norm. :rolleyes:

I'd buy your decode until something else comes along. graemlins/thumbsup.gif

Originally posted by 4spdrat:
I've posted this before with no luck, let's try again.

I have the following # on the pad above the pan on the driver's side of my TH400 from my '69 SS.

H0T07053

H=Hydra-Matic
0=model year is 1970
T=Transmission
07053=Unit Sequence number produced.
The Cleveland plant started producing at 00001 and went up to 14999,so it was from the Cleveland Plant.

There were 4 Transmission plants making these for:
Buick-Olds-Pontiac-Chevrolet-Cadillac.

They didn't use a Passenger side suffix tag, because they didn't know what application that trans. would be used for.


These would be for a service replacement and not necessarily a warranty item.

Thanks VERY much guys! graemlins/thumbsup.gif I can rest easy now, LOL.