How would the gearing be with 33s.would it be better then 35s

 

What size tires do you have now? With OD off, how many rpm's at a steady 65 mph ? Driving with overdrive off is key to the automatic and larger tires with the 3.8 and 4-speed trans.
Yes, 33's spin about 300 rpm's more than 35's at 65 mph. So, 33's will keep you in the power band while 35's will drop your rpm too low that the engine lugs.

 

I have 265/70r17 bfg km2. I think the rpms are like 1800 to 2000 at 65 maybe don't know exactly how much usually

 

That's with overdrive on never checked over drive off

 

Overdrive off so the trans is not constantly shifting.

 

There are some FAQ's stuck right to the top of this modified area. The links may still be broken, so scroll down to the drivetrain section, you will find some great charts that are built specifically for the JK.

Measure your tires - don't use mfg spec.

For OD Off, divide the rpm you come up with by .69

example for a 3.8 auto:
3.21 , 31" tire (32" tire measuring 31" actual) = 1681 rpm @ 70
1681 / .69 = 2436 rpm (OD Off)

Move up to a 35" tire (34" actual) = 1533 rpm
/.69 = 2221 rpm (OD Off)

And 5.13's, which are a very popular ratio for a 3.8 auto on 35's:
= 2450 rpm @ 70 (OD On)

So with some number manipulation, you can get a fairly good idea of where you will be in various scenarios.

 

Can you run stock rims without spacers if you only run 33s. If it's only a daily driver and no flex or disconnecting of the sway bars how big can you lift before driveshafts need to get changed.

 

https://www.jk-forum.com/forums/modi...17/#post211274

33"x10.5" tires with zero lift. This link will answer your questions.

 

Just got a Rubicon Express 3.5" lift for my 2008. 33 inch Tires. Will get 35 next.

 

That looks good. What shocks did you get with that kit and is that an auto or stick. Did you have any driveshaft issues.