Throwitup518

I also have decided to do 4.56, was able to talk to a member on here with the same set up (4.56 with 37's) and he said it was great, good performance, not sluggish and around 2100 rpm's at 75 mph on the highway. Exactly what I'm looking for!

Sunsetter

i have 4.56 and highway i can get up to 14 doing 65. so 75 i would say 12.

CPT150

4.88 here. I looked at this chart that someone gave me on this site, and it looked as if 4.88 would be the best to get back or better than stock. Personally, Im glad I did though I dont have 4.56 experience to compare to. Good luck