So I have spend the last 2 days trying to determine what gears i'm running, and being a OCD I just cant figure it out exactly. I've got a 2003 Jeep wrangler X 4.0l I6 5 speed manual with a dana 35 rear. For the longest time I thought they were 3.73s but when requested my build sheet based off the VIN it said they were 3.07. It dropped my jaw because they don't feel like 3.07 at all. I've done 3 different formulas, and checked for the tags that went there, and all the formulas come out to something different. I read somewhere if it has the towing package it will have 3.73, and I don't know if mine has it or not but its got a uhaul hitch that is bolted to the frame.
I've got 31x10.50x15 bfg all terrains that measure about 29.5 inches in diameter.
when im in 4th (1:1) going 60 mph i'm pulling 2250 rpm
when im in 5th going 60 I pull about 1750 or 1800 rpm
hope someone can help me..