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  #1  
Old 01-11-2011, 04:34 PM
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Default New to the forum and have a gear ratio question

Hey guys I posted this in the newbie section but just thought I would put it in here also. I just got another goat, it's a 2002 RAM sport 4x4 with the 4.7. I had a 99 back in high school and I have missed it. The truck has 9in lift and 37's on it right now. I dont know what gears it has in it. Im guessing 4.10's because it's pulling them pretty good, alot better then my 99 did with the 5.9 and 33's with stock 3.55 gears. My question is what rpm should I be turning at 70 mph with the 37's??? and how bad do you think the speed odo is off?? THANKS

Here's a quick pic of it
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Old 01-13-2011, 10:47 PM
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Are you sure ? Those don't look like 37's .
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Old 01-15-2011, 11:29 AM
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Yes they are 37X13.50R20 toyo open country mts. I will just get my wife to drive up beside me in her car on the highway and see how bad off it is. From what I can tell its only off by around 5 to 7mph at 70 and its turning right around 2,000rpm ?? I was just wondering if anybody else on here had the same set up, but I guess not. I will just jack the rearend up and mark one of the tires and the drive shaft and see how many times the tire turns to one turn of the drive shaft that will give me a pretty good idea of what gears are in it.
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Old 01-15-2011, 11:32 AM
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Plug in the info on your truck here and get a full build sheet emailed to you!

http://www.dodge.com/wccsapp/univers...ull&category=U
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Old 01-15-2011, 12:22 PM
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Try this.http://pw1.netcom.com/~sgalaba/tiresize.htm
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