kh202

That's with 35's but yeah I don't use 6th gear.

gibsonfirebird12

Yeah, as I said in my original post, they are used 3.73 from a 2010. They were taken off at 10k miles. My technician told me I'd be looking at 1k for install for everything (inc truetracs). This doesn't really seem too out in left field to me and I'd imagine just doing the truetracs alone won't be much less and I'm getting a good deal on 3.73s.

I know exactly what the improvement is in terms of RPM. While it wasn't in the original post, I'd like to know if it's worth it too. I am only going off of what people have said (3.21s are too underpowered, 3.73s are perfect for 33s or 32s). I have read that in multiple places. I just want a little extra giddy up, and everyone's like "well if you're gonna go to 3.73s might as well go to 4.10 or 4.56." Yeah you can say that, but am I really gonna need those gears if I don't plan on 35s or 37s? Wouldn't it be worth putting 3.73s in while they are doing the truetracs if it isn't much more install and I'm getting them cheap?

kh202

Remember, a lot of the complaining you hear about 3.21's being so terrible and just go to 4.10 or 4.88 is from people with 3.8L. I don't get how people can say a stock 2012 with 3.21's is a dog. It’s a jeep wrangler that goes 0-60 in or just under 7 seconds lol

Regearing the 3.6L is a different animal. Some people running 37's are only gearing to 4.88 now. Really recommend getting the 33's, seeing how it feels to YOU and go from there man.

Jonathan_JK

I bought my JK with 3.73's put on 17" wheels and 315 70's on that measure 34.5" @26psi . The combo weighs 98 lbs. I'm at sea level and its borderline needing a re gear.

gibsonfirebird12

I actually was aware of this, and all the information I found about 3.21s vs 3.73s I made sure was in regards to the 3.6L...and once again I've been using the chart as the source of my information:

3.6L chart: jeep wrangler 3.6L gear chart - Miscellaneous - Gallery - Tennessee Jeeps
3.8L chart: jeep wrangler 3.8L gear chart - Miscellaneous - Gallery - Tennessee Jeeps

According to the charts (can you tell I'm a math/statistics guy?), 3.73 is about equivalent to 4.56 on the 3.8L, which a lot of 3.8 guys tend to think is a good gear ratio. The 3.21 is equivalent to the 4.10 on 3.8L JKs, which according to many threads, is just a bit too low (numerically). BTW I am talking auto here, because that's what I have. The 3.8L manual and the 3.6L manual is a WHOLE different story.

That is not surprising. You're getting about the same exact RPM as I am with 32s (31.5 measured) on those 34.5" assuming you have an automatic. If you have a manual, it's even worse.

is the risk really that great that the technician would F it up so bad that it could grenade? That's what I would be most worried about.

kh202

Haha you're money man. Can't believe everything you hear on the Internet about what's best. Friend of mine has managed 37's with 3.21's and 3.8L for over a year.

Last words of advice, get tires then decide on regear or not lol. That's all I've got

Matthewd5

Ok I've followed this thread...I have 2012 2 door Jo with 3:21's, from that chart for the engine I have, it seems that 3:73 is a baby step, even if you never go above 33's

I have 285/70/17 Goodyear duratracs which aren't quite 33"

I'd love to upgrade to 4:10's but I'm holding off till I can get ARB Lockers installed during the regear... I was concerned when someone said that they didn't know of anyone selling new 4:10 gears

I guess I was assuming that they were readily available...

What are appropriate gears that are available? I have 33" now but will probably go bigger at some point...

Matthew

170-3tree

do it! a grand is good, you don't plan on going bigger until it's paid off. it WILL be a better driving experience for you and probably feel like money well spent. the 3.21's are alright for 33s but moving up from 31's you will want some power back. and you'll love the tru trac without spending the extra on lockers.
well the dealer notice? if he's in there, yes, if he calls you out on it? Then don't turn intoa prick and he might do enough to help you out working around things.

kh202

I hear this all the time and don't quite get it. Shoot Marcus at River City offroad a pm. I got the same quote for 4.10 or 4.56 shipped, as well as at a local shop (slightly higher tho, cuz Marcus rocks )

gibsonfirebird12

You can buy 4.10s new. Finding them used is very tough for a non-rubicon, because you can't use rubicon gears in a non-rubicon. the only way to find 4.10s for your 2 door would be to buy new ones (alloy usa makes 4.10s, so does MOPAR, they are expensive i know because I looked in to it.), or to find someone who regeared twice (4.10s and then to something else) and grab their take offs.

the most common cheap new gears are 4.56, and that's what you'd want for true 35s or 36s. Anything below a 35 (again, how it's measured, not what it's advertised as), you'd probably want 3.73s or 4.10s. If you have low gearing with smaller tires you're going to kill your mileage, if I understand it correctly. For example, putting 4.56s (easy gear to find) in a JK with true 31s would be ridiculous overkill.

let me know if you need any more information and I can point you in the right direction. my personal opinion is that the best overall gear for 2012+ jks is 4.10. You can run 32s on them, 33s are good on them and they still have power with 35s. For me, this doesn't work. I'm never going over 33s. Getting 4.10s would just be too much and too expensive (because I won't be able to find used gears).

Haha thanks bud. I'm not arguing with you, just bullshitting about it at this point. I'm probably gonna buy the 3.73s anyways, I'm getting a great deal on them. Whether or not I put them in, that will be a different story.


Thank you.

this thread has been great.