It all costs the same whether you are going to 3.73s or on up. The gears themselves are around $600-700, labor is another $1000 or so. Plan on what you're going to upgrade your tires to (if you are) now, so you aren't buying gears twice.

 

I had $80 in the carrier for the front. $675 in the gear kits for front and back with name brand bearings n gears. N install was $700. I went with 4:56's and glad I did. I'm running 35's n still have the gearing to go to a 37 n still be ok. Definitely satisfied.

 

I had $500 in 4.88s with master install kits... And maybe $25 in fluid.

 

These men speak words of iron. Budget be damned. Do it right the first time, get your bigger tires and moderate lift now, and regear to a performance level for that size tire. If you need to cut cost at this time, just regear the rear and have them pull the front axle until you can afford to do that too. Just don't 4wd until then no big deal

 

Did a search thru the forum and couldn't find too much about this, so I thought I'd re-post the question here...


I've got a 2013 2-door JK, 3.21 6-speed manual [sport]. 32" DuraTracs --slightly smaller than stock. Owner's book says towing capacity for 3.21 gear ratio is 1,000 lbs. Owner's book also says same vehicle w 3.73 gear ratio, tow capacity is 2,000 lbs...

If I re-gear to 4.10, would that increase the towing capacity enough? Will also upgrade from stock radiator. I'm looking to tow just under 2,000 lbs... Can I do this [safely] in my 2013 2-door JK? Any insights would be appreciated!

Thanks!

 

The quick and simple answer is yes, it's all in the gearing. If you regear lower, you will be capable of towing more.....assuming of course you have a well secured receiver/hitch. The 3.21s only rated for 1k lbs cuz they can barely move the jeep itself efficiently. With 4.10s and a solid receiver, you should be perfectly fine towing 2k lbs in my opinion.

 

Thanks! what about the difference between 4.10 vs 4.56.... on 32" tires, will that make too much difference? Or significantly affect towing? Highway driving? Thanks again for any thoughts/advice!

 

Well, as most things, it's a trade off. You'd love the towing and low end of the 4.56, but the high end would be a bit much for most people's preference. That's going to put you revving a bit high at highway/interstate speeds. With 4.56, you'd be ~2850 RPM at 70mph and ~3k+ RPM if you drive faster than that. That is about where I am on my 5.13s and 37s on my 3.6L. It's bearable, but it's lower gearing than most would like. It would take a decent bite out of fuel economy. 4.10's would probably be a little better all-round for you IMO; however, if you every think you might go with a larger tire then 4.56 might make some sense.