kovz
+1y
It depends on the year RX7, some of them came with different spline counts on the axles. I believe the earlier models had a different spline count. The later year RX7-TT models fit in the B2600i rearends. But I know the '84 GSL model fit into my B2200. Do a search on here or google, there is some info out there. You have to extend the B-series axles to correct the end play. In my case, I was already narrowing the rearend so I had to cut down my axles and respline them. I had a machinist do the work so I don't know the details involved.