i also forgot to mention this is also my tow vehicle for when me and my buddies head out to the dunes. thats why i am concerned about highway compatability. what kinda rpm's are you spinning at around 70-75?
right now most i can do is about either 3000 rpm's in 4th, or 2400 in 5th. but it feels like a dog pulling them small hills.
Go to this page and you can play around with gear ratios and tire sizes and it will tell you the RPM you will get.
http://www.csgnetwork.com/multirpmcalc.htmlAs another thought for you to get by on the cheap for a while, maybe you should pick up another set of wheels and tires for your highway driving. Running a set of 31's would probably work out pretty well for you on the highway until you have the cash to change your gears. Might look kind of funny with a 5 inch lift and guppy tires, but it is worth a thought.