MY Tj has 32x11.5x15 tires and I do not know if it was regeared. So I checked only what the original tire size for saharas was, and the size I found was 225/75r15 tires but the sticker on my door jam says the original size was 205/75r15. Is this normal? Is it a typo? and how can I determine if it has been regeared without opening up the differential.
With regards to the tire size, the door sticker only will have the base tire size. Optional sizes will not be on the door. 30" should have been stock on yours You can get a build sheet from chrysler to verify)
The ratio it came with will be on a tage on the front and rear differential.
Jack up the rear and rotate the tire one revolution vs how much the driveshaft rotates.
I checked out the Tag and the ratio is 3.73. How does the tire size affect the speedometer? Will changing the gears help my mpg? And I have been thinking about upgrading to 33's will the gears still work alright?
The gears will still work, the jeep will just be slower. Is the jeep auto? Where any other modifications done besides regear?
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I'm pretty sure I know what I'm talking about. I think...
I am running that setup exactly with 3.73 gears. I've had the jeep 2 yrs like this and have had no problems. I do have the 4.0 not sure what you have. I can use 5th gear on the freeway just fine and still have plenty of poop for scootin around town. If I had to nit pick, wheelin in rocks can be a bit jumpy but very manageable. In a nutshell very liveable. Hope that helps.
I have a 99 TJ with the Dana 44, 3.73 gears running 33X12.5 tires on 15X8 rims, Automatic.. No issues. 3.73 still fall into an acceptable range for 33" tires on most gearing charts that I have seen. Upgrading isn't necessary.