No just the rear bearing cap, trans can stay as is. While you have the rear main cap off take a look at the bearing surface and the crank. If either one looks damaged in any way I would go ahead and check the rest too while I was at it. You can get a plasti-gage set of a few bucks at most parts stores, check all the crank and rod bearings. Mine were all fine still thank God even with 170K so I just did the RMS, oil pump, and one piece rubber pan gasket (definitely get this) and called it done. One the top end I replaced the cam, lifters, timing set, injectors (4 hole), thermostat and sent the head out to get tuned up but unless your having issues with it I wouldn't bother. Balancer was fine too by the way.