ShakyJake

I got charts from the guy who did my hemi swap. Here's the one for my combo (545 RFE auto with 35" tires). Let me know if you want me to post a different combo.

Sahara Lee

Are we really getting short-changed when it comes to tires?

OE Bridgestone Dueler A/T Rh-S P255/70R18, Overall Diameter = 32.1, Rev/Mile = 649, Effective Diameter = 31.1

BF Goodrich M/T T/A KM2 35x12.50x18, Overall Diameter = 34.8, Rev/Mile = 598, Effective Diameter = 33.7

Note: Effective Diameter equation is: 12(fpm/trpm/PI)
where:
fpm = feet per mile = 5280
trpm = revolutions per mile based on manufacturer testing (see ASTM F1806) or extrapolated data fom those tests
PI = 3.142...
12 = inches per foot

As stated previously, changing tire sizes and gearing is a complex endevour more subjective than objective. Every change is a compromise. Every compromise is a personal choice that makes your Jeep unique!

"You can't always get what you want, but if you try sometimes you just might find you get what you need."
- Mick Jagger/Keith Richards

JPop

Thanks for posting that chart! Not planning on doing a Hemi Swap for my JK, but I do have a hemi and 35s on my Dodge Ram. 4.56s were the call there as I was torn between 4.10s and 4.56s and just wanted to keep my options open. No complaints and I could go to 37s without issue, outside of needing to go aftermarket on my fenders and bedsides.

With the stock tires (measuring 30.25") and 3.73 gears I was getting some bog at 60mph on slight grades. The intake is a little loud, so it definitely would make some noise and a sucking sound inside the cabin when the throttle blade moved from wide open to partially closed when returning to flat ground. With the 35s and 4.56s I don't get that unless I'm hitting steeper grades and later with the Superchips Trans tune, it's set to downshift well before I get any bog.

C_GERM

i mean how much is it to re gear?

JE8154

I was recently quoted $300 per axle and thats fairly cheap for this area.

so roughly...
$600 Labor for gears
$550 gears/install kits
$350 diff covers
-----
$1500 total

JE8154

Yea I think I also have to get new carriers since I have 3.21's and going to 4.56's. No idea how much those are going to cost me. Plus I'm gonna end up doing sleeves/gussets/ball joints all at the same time. I'm probably going to wait until I hit $2500 in my jeep savings account and do it all at once.

Wgrin

I paid 1800 from 3.21 and that was to 4.88. You can haggle the price I did they took off 200

Ronstar83

I just bought a set of 4.88's but haven't installed yet.. I have huge steel front and rear bumpers and alot of extra weight. Are you all running similar rigs? Not sure if I should return them for 4.56's now?? Thought I had it figured out.. Guess not! lol Please advise!

XBlacky08X

Go 4.88 if you carry a lot of extra weight.

Ryan0260

I agree. It will give you the extra torque to help push the extra weight