I have 4.1 gears and the gearing is way too short for my needs.

Who has swapped to a taller final drive, and what is your verdict?

 

Id say just do it. 4.1 to 3.7 isn't that much of a difference. Especially if you have the overdrive transmission.

You will need to change out the speedo gear if you have the hydraulic transmission.

If you want to get better gas mileage go with something around 3.5.