Identifying 400TH transmissions?

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VintageMusclecar · #1 11-25-2003, 06:31 PM

I've stumbled on 2 400 turbo transmissions and I'm trying to identify them. Are there any online references available to decode these? They both have the aluminum tag on the pass. side of the case, one is "70 CB" and the other is "70 CD". Are these the codes to ID the transmissions, or are there other codes?

Thanks in advance!
Eric

**YENKO DEUCE REGISTRY** · #2 11-25-2003, 06:50 PM

The vacuum modulator will be at the front of the pan instead of the back like a TH350.

I believe I have a spare TH400, also coded CD, I pulled it out of a '68 Impala along with it's 327/275hp engine.

**Mr70** · #3 11-25-2003, 08:20 PM

The CB & CD TH400 was used from 1968-1975 cars.
But your transmissions specifically were used on:
70 CB=is a Turbo Hydra 400 that came mated to 1970 LS5 454/345HP Chevrolet.

70 CD=is a Turbo Hydra 400 that came mated to 1970 LS3 402/330HP in the Chevelle & Monte Carlo.

Can you see any numbers stamped into the tag?
They should be the Julian Date code,and the serial number for that Trans.

VintageMusclecar · #4 11-25-2003, 10:33 PM

Thanks for the replies.

I'll have to get the other #'s later; a friend has these stashed away in storage, so I'm at the mercy of his schedule.

One (I believe the CD coded one) has a 6-lug torque converter in it...would this be the OEM converter, or maybe a truck converter?

Thanks again guys [img]/ubbthreads/images/graemlins/beers.gif[/img]
Eric

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