rear end will help. i have no personal experience with your specific model of car but most of the times that i have changed rear ends it is pretty much a numerical difference. ie if you now have a 3.69 rear end and you put in a 3.31 then divide the difference and find a percentage, in this case you would be around a 10% reduction in engine speed and if you were getting 25 before the change you would get around 27.5. you will also reduce engine noise and wear by the same amount. i have changed the rear ends in at least six vehicles and the only one that the improvment was not clear in was my 81 280e. all others were much as i have described.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.