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TH400 Tranny ID Help

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Old Dec 29, 2009 | 04:00 PM
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Default TH400 Tranny ID Help

I'm trying to ID my tranny. I cannot find a serial number, but I do have an ID tag attached to the passenger side just above the vacuum modulator. The number scheme is:

1st line: 70 CB 1992

2nd Line: 203

Anyone know how to decifer this? I think the 70 is the model year, and the CB is for big block engine. Don't know about the rest. My car is a 1972, 350 hp coupe. Obviously the tranny (and engine) have been swapped but I'd like to know about the tranny.
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Old Dec 29, 2009 | 04:19 PM
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Hello Jim
The serial number should be on the driver side just above the pan.
Scott
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Old Dec 29, 2009 | 04:45 PM
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Scott,
I have looked and looked and cannot find it. The manuals say there is a machined area where the number is stamped, but I can't find it. Define just above the pan. Is it supposed to be on the tranny pan lip? Is it near the shifter shaft? Near the kickdown connector? Near the front of the tranny or rear? Is it possible some trannys were stamped differently? I've used a mirror, sprayed cleaner and wiped everywhere but just don't see it. I'm old and can't half see but I'll keep looking. It is tough lying on the garage floor.
Thanks,
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Old Dec 29, 2009 | 04:56 PM
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notice the clean spot. this is my 71 bbc turbo 400 trans
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Old Dec 29, 2009 | 05:20 PM
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Originally Posted by airtime



notice the clean spot. this is my 71 bbc turbo 400 trans
That is where mine is on my 71 small block as well.
Scott
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Old Dec 29, 2009 | 05:41 PM
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what kind of hp are these trannys good for?
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Old Dec 29, 2009 | 05:45 PM
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turbo 400 what ever u got. turbo 350 depends how much money u throw at it. stock or lightly modded around 400 lbs of tq
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Old Dec 29, 2009 | 05:53 PM
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Thanks for the pic, it really helps. I'll look again in the morning.

Thanks again!!!
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