235/85/16 tires, 4.56 axle ratio and 1:1 on the transmission. Do the math, you will be at about 3500 at 65mph. The max engine rpm is 3600 rpm.
I limit mine to 60 mph on the speedometer, that is about 3000 rpm. Bigger tires is an easy way to gain 5-10 mph top end but it will slow you on the take off some. 33" tires will gain you about 4 mph. I have 285/75/16's on mine now. With the GPS, 60 indicated on the speedometer is actually 64 on the GPS(at 3000 rpm). 3000 rpm is loud and sounds high!
80 mph would be about 4100 rpm, since they are diesel and governed, 80 is impossible, stock.
Last edited by doghead; 05-21-2009 at 21:48.
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