I also am running this but with a np435, can use 2nd for almost everything but still have have 1st for tougher stuff, with 5.38 gears it gives me 113:1 low range but more normal gearing it will produce mid 80's which will do nicely, didnt notice if ya had a auto or manual, but either way it is a great kit, lets ya retain stock driveline length, I also have a np203 doubler in place of the intermediate housing with stock drive line length, but thats another issue.....think the 3:15 kit is a good one.....