Oh, yeah ... change the transmission fluid and filter too. As with the engine, better lubrication means more power to the rear wheels. (Be sure to use the correct fluid and amount ... I burned up a newly rebuilt transmission because I misread 'pints' when the capacity specification said 'quarts.')
If you don't know the last time the transmission fluid and filter was changed, better do it now.
Likewise, you may want to drain and refill the differential. It's entirely possible it still has the lube that was in it when it came off the assembly line, decades ago. (Better lubrication ad nauseam.)
