4:10's with the 4sp and get a tune for gear change change, tire size correction, and you'll need the benefits of the tune itself, for a little more power and maybe some added mpg's, to counter what the 35's are going to take away.
IMO, 4.10s being just one step away from 3.73s isn't enough change for cost. My first thought and idea would be to go to 4.88s, and it will help a lot, but if you don't want to go that far, go to 4.56s. The tune will help some, but it won't exactly be needed right away. You'll be fine without one.
Gear ratio- 4.56:1 with the 4spd and 35s, assuming 4th is 1:1.
Keep in mind that the numerically higher gear ratio you go, the more teeth are getting crammed into the same size ring gear (meaning they get thinner and weaker).
Standard ring and pinion labor around here is $250/axle. Ring and pinion for front and rear plus master install kits front and rear with all the bearings, shims, etc is going to be about $1000.
So count on about $1500 parts and labor for a full front and rear re-gear job.
I would take advantage of the opportunity while your diff is out and get lockers or limited slip diffs, labor cost will be not different (just the additional cost of the lockers/LSD, but hey, what's another $1k?)
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