Hey guys. I got my 3” lift and just purchased some 265/70/16 duratec tires. I know the height and weight effect the Libertys power and gas mileage. I do not just want to limp by but want to invest to get the power and mileage back up. What is the process I need to do to do this? Should I be looking at the gas 4 banger gears in a junk yard or is there better way to go? Any help and advice is appreciated.

I would need a LOT more information before having any clue on what would be appropriate or desirable.

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'06 Lbrty Sprt CRD 150K

Sasquatch
DSS Turbo
CAT-elimntr
Weeks Stg1&2 EGRfix
PV-200
BLING
vent gauges

IDParts
head
cams
rockers
Timing set
ARP studs
eTn1 GX2123 5v GPs

YETI Custom Tune
Flowmaster 8325508
Carter P76611M
GM 12611872
Hayden 2986
GM 15976889
PATC Custom Billet
2010 Ram Hemi Trans
Sonnax 44957
Transgo kit
Cooper 51770

What all info do you need? I have a 3” JBA lift. 265/70r16 tires. Want better gas mileage and power that is lost with bigger tires and higher ride

4.10 gears would get you back into the stock rpm range for your speed with the 265/70’s. I have 245/75’s and they are roughly the same diameter (30.5”) and I’m wishing for 4.10’s as well. Problem is, there are no stock 4.10 diffs for the KK to swap in like there are for the KJ, which means it would be a lot more expensive.

Some other info to consider would be whether you’re in the mountains or routinely tow a heavy trailer. In those cases you might want to consider 4.56. However, the aluminum front diff on the KJ can only go to 4.10 and you’d need to find a stronger steel diff (JBA used to make them) to run deeper gears. The KK can run 4.56 with their improved front diffs.

Do you have a KJ or KK Liberty?

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2008 Liberty Sport 4x4 Automatic

Jeepin By Al 4" Lift Kit
BFG KO2’s 245/75R16
Full MOPAR skid plates
Rock Lizard Skink Super Sliders
AtTheHelm Front Recovery System & Roof Rack
M116A3 Trailer build thread: viewtopic.php?f=72&t=77997

Well, to start with, your mention of "gas mileage" is the first indication of what engine you might have, although there are people enough that still use that same reference with their diesel vehicles.
lfhoward's inquiry (KJ or KK).
All that you listed is helpful.
Highway use?
City streets?
Country roads?
Off-roading?
Gravel?
Sand?
Mud?
Engine Mods?
Where are you located?
Where will you be wheeling?
Anything about you that would indicate your level of experience re: off-roading, wrenching, etc, things so that we make as few incorrect assumptions as possible.
Anything else that would help us know your use and expectations, what resources are close, who of us has experience in exactly what you want to know, etc.

_________________
'06 Lbrty Sprt CRD 150K

Sasquatch
DSS Turbo
CAT-elimntr
Weeks Stg1&2 EGRfix
PV-200
BLING
vent gauges

IDParts
head
cams
rockers
Timing set
ARP studs
eTn1 GX2123 5v GPs

YETI Custom Tune
Flowmaster 8325508
Carter P76611M
GM 12611872
Hayden 2986
GM 15976889
PATC Custom Billet
2010 Ram Hemi Trans
Sonnax 44957
Transgo kit
Cooper 51770

You guys could just answer the question...

Year doesn t matter too much yet. Shop online for a ring and pinion for the Chrysler 8.25 rear axle. And Dana 30a front ( this will be harder to find...)

Year might play a roll in the master install kit (all seals and bearings)

Then find a local shop to install.
Or
Find a local shop to install and supply the parts.

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02 KJ Limited, 255 70 16 General AT2, Ironman Lift, JCR sliders, Mopar skids, radiator skid, LS/373 gearing, factory front hooks and rear hitch

92 XJ 4.0, AW4, NP242, 31s, 1.75 spacer, ZJ V8 coils, double cherokee leaf pack, 2 inch shackles, dnynomax exhaust, magnaflow cat, front hooks & rear hitch, gas tank skid, front skid, warn t-case skid