Yes you messed something up.

70 x 3.53 x 336 / 28 x .75 for the auto = 2223.9
70 x 3.53 x 336 / 33 x .75 for the auto = 1886.94

It is speed, times rear differential ratio, times 336, divided by tire height in inches, times top transmission gear ratio, equals rpm at given speed.

 

It can be done just by trimming, I have one with 33's on 3 inches for sale now. A tip. TJ rear fender flares fit nice after you trim (I didn't get there on mine). And whether you are running 31's or 33's, get aftermarket LCA's, otherwise you rub when you turn hard. I got a set of RC's off this site for like $35. They are tubes instead of stamped metal and give you the clearance you need plus some extra strength.

 

So now I am thinking 32s would be good, what does everyone think about 32s with c8.25..?

 

Listen, first of all it does not matter what axle you have (that does not dictate gear ratio), You cannot have a 3.53 ratio in a Jeep, 3.55 yes, but not 3.53. However, ratio is dictated but the gears, not by axle. You may have a 3.07, 3.55, 3.73 or if you are lucky 4.10. typically, you will find an auto tranny with the 4.0 came with 3.55, it will have a 3.73 if it also had the tow package. A stick with the 4.0 typically came with the 3.07, I'm not 100% sure what the tow package would have been there. 4.10 you usually got with the auto tranny, 2.5 l 4 cyl package. I'm guessing you have 3.55 since it is the most common.
It does not matter what size tire you decide to run, if you go bigger your gas mileage will suffer, the bigger the worse. You do not need to worry about much more than that until you start trying to turn 35's, then you will snap axles. Of the 2 axles available for your Jeep, you have then stronger (it's not much only like .020 bigger), but I myself would never run a D35.
these guys are just being mean making you do the math, here is chart that shows the math you need. http://www.4lo.com/calc/geartable.htm Hope this helps.

 

Thank you so much... just made my life a million times easier!

 

The Chart is for a 1 to 1 transmission gear ratio! It will not give you the correct info! If you had a 4 speed transmission with a top gear ratio of 1 to 1 it would be perfect.
I gave him the formula because it gives him the correct info about his gear ratio and tire combo, not to be mean!
PS. Math is a good thing to learn, helps figure out all sorts of things you need to know about wheeling.

 

3 inch lift and 33X12.50 mud rovers on stock rims, no spacers, trimmed and folded fender in the rear.

 

This is an awesome Jeep!

 

So, The 33s i originally posted at the beginning of this thread are still up for grabs so i think i am going to get them because what it seems to me is that yes i will have to do some trimming and maybe put it up another inch or so too but it will not harm my car... sucky gas mileage and thats it. any objections? thanks everyone for your help... -Matt

 

Did you get the 33"s and get them put on? I have been following the convo waiting to see an outcome im purchasing 33/12.50/15 tires tomorrow going on some 15" wheels, The jeep is lifted 3" with fenders trimmed so im kinda in the same situation as you. Please let me know how it went for you. Thanks

 

hey , cool to hear you have been flowing the thread. They guy who had the 33s told me he sold them right after i sent him an email asking for his address because i was coming with money in hand If you have a deal on some... get them! as you can see plenty of people have done it and they look good! I will keep the thread updated! good luck!