ghaskett Posted September 12, 2018 Share Posted September 12, 2018 Has anyone done this? I have a great running 65 Riv 401 with T400 set up, but would like to go to a 700R4. A 30% reduction in rpm might keep the old nailhead running a bit longer. Link to comment Share on other sites More sharing options...
SpecialEducation Posted September 12, 2018 Share Posted September 12, 2018 I have not myself, but many have. Here's one source: https://www.transmissionadapters.com/53-66_nailhead.htm 1 Link to comment Share on other sites More sharing options...
NTX5467 Posted September 13, 2018 Share Posted September 13, 2018 Check out the Riviera Forum for use of THM200-4R automatics. That trans, when beefed-up, has seemed to become the darling of the street rod/muscle car people. Takes less power to run than the THM700, bur has a little more reasonable low gear ratio, so not quite so big of a gap between 1st and 2nd, ratio-wise. Plus, as you'll probably discover, it's been done lots of times in the '60s' Rivs. NTX5467 1 Link to comment Share on other sites More sharing options...
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