I have an 05 KJ Renegade with a 6 speed manual. Currently it is stock except for mopar intake and mamba moab copys. I do a lot of interstate driving and can set the cruise at 70 and the jeep pulls all hills, some steep, without an issue or a downshift required. If I lift it and install 245/75R16 tires, will I need to downshift on hills on the interstate? This would suck as I would be downshifting a lot and losing cruise. Pennsylvania highways are no where close to being flat.

Thanks

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03 KJ - OME 927/948 - 3 ring clevis - 1 extra upper per side

I have the 6right speed with 32" tires ...I'm guessing that you'll have to downshift on the steeper hill but maybe not. I still have a lot of power even with the taller tires.

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'05 Renny 6 speed
OME/Bilsteins, Spidertrax Wheel Spacers, Husky Liners all around, Gutter Guarded Grill, 1 ISO each side rear, Boilers top shims front. And a whole list of things yet to do.

Have you ever had to downshift when on the interstate?

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03 KJ - OME 927/948 - 3 ring clevis - 1 extra upper per side

i too have a lifted 6 speed and live in PA.

-on the highway with stock 3.55 gears and 265/75/16 tires with alum. wheels i did have to downshift for long hills.. or steep hills.. but hardly ever.
-on the highway with stock 3.55 gears and 265/75/16 tires with steel wheels i did have to downshift for long hills.. or steep hills.. quiet frequently.
-on the highway with stock 3.55 gears and 245/75/16 tires with alum. wheels hardly ever had to downshift.
-on the highway with 4.10 gears and 265/75/16 tires with steel wheels i never had to downshift on the highway.
-on the highway with 4.10 gears and 31x10.5/15 tires with steel wheels i never have to downshift ever..and it will pull up any hill with 6th.

side note - with 3.55's and 265/75/16's with steel wheels i was getting 13-14mpg. with 4.10's i get 18-19mpg (20 all highway)... and with the 4.10's and 31x10.5 15's with steel wheels i recently got 22mpg on all highway

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2006 Renegade. Completely stock.

I think 2006kjI'm covers it.

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'05 Renny 6 speed
OME/Bilsteins, Spidertrax Wheel Spacers, Husky Liners all around, Gutter Guarded Grill, 1 ISO each side rear, Boilers top shims front. And a whole list of things yet to do.

See we can make believers that gear swaps to match bigger tires does wonders.

Some come around real quick, others still want to argue the point
but they all will come around sooner or later

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MUDD'S MOTORSPORT'S We do IFS lift installs ,
03 OVERLAND EDITION /Kilby-Skidrow-Mopar-4XGuard skids/ 2.5 inch TOTAL CONTROL JBA coilovers -JBA Arms/MOABS-31 FALKEN WILDPEAK AT3W / 4.10's etc, 04 Kilimanjaro Edition loaded, plus 05 KJ limited

hey now!

haha... you can for sure run a 265/75/16 tire with steel wheels and a 6 speed with 3.55 (stock) gears. i did it for 40k miles..

then when i could afford it... i went to 4.10's. it is A TON better.. but stock gearing is 'ok' and has plenty of power. So to the original poster... 245/75/16's will effect your power... but by NO means make it undriveable!

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2006 Renegade. Completely stock.

I have 4.10s sitting in a box until I can get some cash to get them installed.
I have no issues with my 31s and steelies.
I can't wait! until I can drive my truck with the new gears.

I think its easier with the manual because since you're choosing the gear, you're always in the correct gear.
We don't have to worry about the transmission constantly downshifting trying to find the correct gear.

Now you got me excited, haha.

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-dbk
SOLD2007 6 Speed - Projector Retrofit -Custom LED Tail Lights - Lights on Cowl & 130w 8" ProComps - Full Skids-RockLizard Super Skink Sliders-Front Hitch
Frankenlifted-Al's A-Arms-Goodyear Duractracs 31x10.5R15x7 Cragar D Window 4"bs-Cobra 75WXST - 4' Firestick
4.10s sitting in a box - 3
Sold-1988 Suzuki Samurai
2002 Jeep TJ

Thanks for the data!

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Mike Smith
06 KJ Sport - PA - ONSFARI

OME 926/948 w/ OME Shocks, 3/8 Boiler, 1" LTT, a bit of Clevis lift
MOPAR Skids, Custom trans skid
Valley Roof Basket with Extension (when required), Homemade fence post crossbars with Thule system to compliment
Mastercraft A\T Something or another...

Wow, perfect answer. That was exactly what I was looking for. No excuse now not to lift the KJ.

Thanks for all the answers

-Dave

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03 KJ - OME 927/948 - 3 ring clevis - 1 extra upper per side

Does this data translate to improvements for us auto drivers?

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07 KJ OME 927/948, Bilstein shocks, JBA 1/4" plates+about 3/8" clevis, 2 extra rear isolators sitting at about 3.5" of lift with 245/75-16 Duratracs on Moabs (painted black)

You bet it does, even more so in some ways
with 32s and 3.73s I couldn't use overdrive at all
32s/4.10s its like driving a stocker only better

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MUDD'S MOTORSPORT'S We do IFS lift installs ,
03 OVERLAND EDITION /Kilby-Skidrow-Mopar-4XGuard skids/ 2.5 inch TOTAL CONTROL JBA coilovers -JBA Arms/MOABS-31 FALKEN WILDPEAK AT3W / 4.10's etc, 04 Kilimanjaro Edition loaded, plus 05 KJ limited

Thanks again Tom. Will I also need to look at having my computer reprogrammed and speedo gear changed? I just read my 07 is a little different in that it's on the ABS system so only a dealer can adjust speedo. Is that correct? I just want to make sure if I put out the expense for 4.10's I get the most MPG improvement I can but I hate the thought of needing the dealer to do the work.

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07 KJ OME 927/948, Bilstein shocks, JBA 1/4" plates+about 3/8" clevis, 2 extra rear isolators sitting at about 3.5" of lift with 245/75-16 Duratracs on Moabs (painted black)