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Message: [QUOTE="TD-5, post: 1184190, member: 12311"] Ask yourself a few questions , How much highway vs town driving do you do, when your on the highway what speed do you cruise at?, how much towing do you do? Again highway or city? What RPM do you want to cruise at on the Highway? Plug some numbers into the following formula and see what you get. Also measure your tires, A lot of the time the actual working diameter of the tire is smaller than what's printed on the side wall. rpm = (speed x (axle gear x od gear) x 336) / tire diameter OD Gear for the 5R110 = .71 4.30:1 are a good all around gear for the 37", 38" tire, that being said I went with 4.10 in mine with 37" tires, actually 36.3" tall. I got a good buy on the OEM gear sets other words I was looking at 4.30"s. I highway drive 600km every couple of weeks so I wanted to keep my RPM at or below 2000 at cruising speed. The 4.10 also allow me to drop a tire size & still not be geared to deep. [/QUOTE]

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