[Cobra20646]

Kirk,

Ron61's advice is more on target....... it's not just the rear end gearing, you MUST also consider the transmission gear ratios and spread of the gears, also refered to as wide or narrow.
I remember that years ago, we used to look at an overall ratio of about 9.0 to 1 for first gear/rear end gear. For example, a 4.10 rear with a tranny first gear of 2.2 would equal 9.02. When that number starts getting larger, your first gear starts to wind up to red line real quick...... a lot of guys running a t5 with 3.7 gears don't even use first.
- Jim -