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<p>[QUOTE=&quot;7mouths2feed, post: 698698, member: 12268&quot;]I have PM&#039;ed you the info you need to calculate engine RPM&#039;s at a chosen MPH. Tire sizes make a small change from 22.5lp to 24 tall there is about 100 rpm difference. 22.5lp are 41&quot;. 22.5 tall and 24.5lp are roughly the same height of 42&quot;. 24 Talls are 44&quot;. Of course manufacturers are going to differ some but within the same brand they will be about a 3 in. difference from shortest to tallest. Your biggest change comes in the transmission and rears you choose. The reason for 22.5lps is that they will typically give better milage due to less rolling resistance. The need for them with the taller rear gears is that the tires will give you back about 100rpm to put your motor in its tourqe range and not lug the motor. You want it speced so that the rpm&#039;s are no less than 1200rpm at 55mph in top gear. Once you start playing with the info I sent you it will all make more sense. I have not heard good things about the singles. Availability over the road and poor wear are what I have heard most. I don&#039;t know how tall the singles are but asumming they are equal to a 22.5lp you would need these specs to get best milage. .73 final ttrans, 3.36 rears and the 22.5lp at 41&quot; 65mph = 1307rpm 70mph= 1407rpm. I think a 3.55 would be a better choice for mountain driving. .73 final, 3.55 rears, 22.5lp 65mph=1380 rpm 70mph= 1487rpm. You never mentioned what tranny you are considering which would be a determining factor depending on where you are going to be hauling. Personally there are only 2 choices for tranny&#039;s 13 and 18. Given a choice I&#039;d go 18 for the most versatility but if you know you are going 53ft reefer then 13 would be fine.[/QUOTE]</p><p><br /></p>

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