MaxdaTrix can sell you a new driveshaft. Which you'll want anyway as the U-joints are not replaceable in most of the RX-7 driveshafts. The early model rear axles 79-83 had a different flange on the differential pinion than the 84-85 axles. I know the stock 85 shaft worked with my NA transmission. I'm unsure whether the TII splines are different than the NA at the transmission or not. If so they can probably put the proper yoke on the front for you. Best bet would be to give them a call and discuss what you want to do with them. You can't use the FC shaft as it is WAY too short.
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