It isn't a cheap job, but its not like you will do it often.by the way you dont need royal purple syncromesh for the rear end.
there are no syncros in the rear end LOL.
i would go with valvoline or better in the rear end. because all this stuff is going for like 10 bucks a quart and you need 6 quarts for the tranny and the rear end. thats 60 bucks plus tax.
if you use valvoline in the rear end and redline in the tranny you can get away with 40 bucks.
plus you need to purchase a sucktion pump for like 10 bucks. and you need to get a allen socket which only comes in a set and cost me 14 bucks at autozone. so if you are not carefull you will end up spending 90 bucks including tax to to the entire job....................!!!!