[hatchetrider]

Just interested to know if anyone has used a hypertech tuner on their 4.0L

[LDO]

Good question. I was also looking at using one of these to adjust the shift points on my transmission. Would like to know if anyone has used one and how it worked.

[hatchetrider]

Well i already have it and can tell you that the only thing you can adjust is the rev limit and the speed limit so if thats the only reason then dont bother, i was looking for better mileage.