Here is the list of available transmissions from an NCRS C3 Specs Guide:
- TH400 was used with all engines up to and including 1975
- For 1976 & 1977, TH350 used with L48 and TH400 used with L82
- For 1978 through 1981 the TH350 was the only auto trans available
- 1982 has the 700-R4
Chris Sale
'64 Coupe