has anyone out there put 4.10s in a 2wd screw? i am thinking about it from the little motor being underpowered. last weekend i got 20 mpg on a 200 mile trip with 209k on the odometer. it currently has 3.55s and runs at about 1900 at 70. or would 3.73s be better which was my original plan?

 

I can tell you that when I put 4.10's in my '01 Scab (w/4.6L & 3.55's) the standing start accelleration was dramatically increased. It did, however, turn alot of rpm's on the road, which I was knew was coming, and thought I would be okay with. I wasn't. (I wish I would have stayed with the 3.73's, which was my first gear change!) You will probably not notice a big difference going from 3.55 to 3.73 considering this is a just a ".18" increase in gearing, but your fuel economy won't change much at all. I saw between 16.5 - 19 mpg with the 3.55's, 16 - 18 mpg with the 3.73's, and 13.5 - 16 mpg with the 4.10's. All of this is on 87 octane.

I tend to be somewhat O.C.D when it comes to stuff like this, and I had
3.55's, 3.73's, and finally 4.10's in the same truck, all within a month of the first gear change. So here you go...

3.55 gear ratio:
55 mph = 1,550 rpm's
65 mph = 1,800 rpm's
73 mph = 2,000 rpm's
80 mph = 2,200 rpm's

3.73 gear ratio:
55 mph = 1,650 rpm's
65 mph = 1,950 rpm's
73 mph = 2,150 rpm's
80 mph = 2,375 rpm's

4.10 gear ratio:
55 mph = 1,850 rpm's
65 mph = 2,100 rpm's
73 mph = 2,350 rpm's
80 mph = 2,600 rpm's

Hope this helps.

 

you probably got better mileage with the 4.10's