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I am going from a 400 turbo to 700R. Do I need a different flywheel?
Same flywheel but if yours has any damaged teeth you're better off simply buying a new one. About $35 if I recall and available everywhere. I ditched my old TH400 in favor of a beefed TH700R4 back in 2010. The TH400's use the larger 1330 Spicer u-joints so when you use a 1982 transmission yoke you'll have to use an "adapter" u-joint as well as shortening your drive shaft 1-1/2".