An easy way of removing those seals is to drill 3 small holes evenly around into the metal portion of the seal, thread a screw into each hole, and slide hammer the seal out.
You'll also need some special tools to do the job correctly. A mag base and dial indicator to check backlash, a inch/pound torque wrench to check pinion bearing preload, bearing pullers and drivers, and a hefty breaker bar to tighten the pinion nut.
For my 5-speed conversion. Picked it up for $500. salvage title. Engine runs strong and the tranny shifts smooth. I will keep the drivetrain. Everything else will be parted out. The car looks like it was hit by a train. Door jams, fenders, core support, everything looks bent and cracked. Thank...