| Re: 425 Switch Pitch Tranny [message #287275 is a reply to message #287227] |
Mon, 14 September 2015 17:16  |
LarryInSanDiego
Messages: 336
Registered: September 2006
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IIRC, that would translate to 1972 Cadillac. Cadillac is A, Olds is O, Buick is B, Pontiac is P, Chevy is C for most of the HydraMatic lines, at least of that era, just not sure about GMC app. However, the J refers to a specific app, meaning unknown. Reason I was asking is I have a very late ('77, '78-ish? I have to look) TH425 I wanted to convert to switch pitch. Manny told me it's too new and wouldn't have certain internal passages required for SP. I currently have a rebuilt one with FD out of a '70 Eldorado I bought from a Cadillac hot rodder as my $500 GMC special came without a trans/FD. Manny says that'll work but I have no reason to modify it as it works just fine. FWIW, I haven't checked the gear ratio, might have a 3.07, perhaps even a 2.73. Manny knows the cutoff year, I believe yours is modifiable.
Larry Engelbrecht
San Diego, CA
'73 26' ex-Glacier
TZE063V100319 03/07/73
[Updated on: Mon, 14 September 2015 17:24] Report message to a moderator |
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