I was going down the freeway at about 70 and wondered what it will be like with 4.56 gears, I have 3.73's. So I put it in 4th gear and it looks like the revs go right to where they would be with a 4.56 re gear. Doing some math says it is really close. So, it performs well around town and for real 4x4 I do have the 4:1 TC for low range. If I am going to re gear for better highway performance, why not just take it back to 4th and call it good. The 3.73's seem to be just fine and the $2K will come in handy other places. BTW 4th is a 1:1 gear so it could even run cooler. 5th would be a great down hill gear for coasting. Is there a flaw in my thinking to really need the 4.56's. I do know that a 5 speed that uses all 5 is ideal.