Quote:
Originally Posted by Dino Driver
I would talk to 2 diferent places, a tranny shop and a shop that specializes in rear ends. Take the gear ratios of your tranny and size of tires your running. Tell them what type of driving you do, IE: city driving, freeway to lets say 70MPH, what RPMs you expect to run at that speed or if you want a combo of city and highway, do you want to be fast off the line or quick acceleration once you're already moving. I have a 4L80 tranny and I plan to run 28" tires and I'm going to put in a 3.73 rear end.
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yeah but your 4l80e is overdrive. you can run those short gears..
your 0.75 final drive with 3.73 at 65 mph will give you about 2200 rpm
my 1.0 final drive with 3.73 at the same speed would be 3000 rpm
I figure that I need to be at about 2500 rpm or less doing 65.
which leaves me at 3.08 rear at 65 mph with a 1:1 final drive = about 2500 rpm..