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Old 10-30-2012, 12:44 PM
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03 wj going up

I'll soon be installing a 6 1/2" lift kit and putting 35" tires on my 2003 wj. I just wanted to see what performance mods I could do to try and get some of the power back after I lift it and put it on bigger tires. I already have a k&n CAI, bore out TB, and magnaflow catback exhaust. any ideas?
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Old 10-30-2012, 02:03 PM
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Re: 03 wj going up

Either get a datalogger and an SCT tuner with custom programming from FlyinRyan or a superchips programmer to help increase performance.
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My Jeep: 2001 Grand Cherokee Limited, 245/65R17 Falken Rocky Mountain ATS, K&N drop in air filter, Bilstein HD's. De-badged, eagle-eye LED Tails & LED 3rd brake light, Addco front and rear sway bars, Superchips tuned & TM snip, interior 6k LED's, Gen3 ccfl projectors with Volt 6k HID lows, akebono brake upgrade with R1 Concepts premium rotors.
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Old 10-30-2012, 05:39 PM
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Re: 03 wj going up

It won't get you any additional power from the engine, but gears should help it feel like it was.
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Old 10-30-2012, 09:19 PM
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Re: 03 wj going up

good luck spinning 35s lol
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Old 11-19-2012, 07:20 PM
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Re: 03 wj going up

I agree with gears. You can do all the engine mods you want, but there will still be strain on the drivetrain. Re-gearing will be your best bet. With a little research you can find the correct ratio that will put your WJ the closest back to "stock"
If i had to guess off the top of my head somewhere about 4:56.. But I don't know if you do a lot of highway driving, our around town mostly.
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Old 11-20-2012, 08:02 AM
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Re: 03 wj going up

i had around 10.5" of lift with 35's. ur gonna need some more gearing to spin thoes tires lol. i had 4.56:1 and that was perfect but i do have a nasty supercharged motor too. if u go up that high i would highly reccommend doing addco sway bars front and rear and then it will ride like a caddy. if i was u i wouldnt go any bigger than 33's with the 4.0. ur gonna add so much stress to that trans., the 42re isnt good from the start. 35's on the dana 35c is not a good idea! i broke many dana 44's with the 35's so its ur call. goodluck with the build, post pics
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Old 12-08-2012, 02:00 AM
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Re: 03 wj going up

tune, 4.56s. I do tune alot of the lifted I6s, it helps somewhat offset the extra load/mileage drop from lift/tires.
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Old 12-17-2013, 06:09 PM
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Re: 03 wj going up

Regearing mandatory. Tuning. I run 35s with my 03, 4.0. What kind of axles are you going to be running with those tires? If you keep d35 you had better not lock it, and treat it like a hand grenade. I have a really nice one, 4:56, new r and p, solid cover, available for when you blow yours up.
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Old 02-04-2014, 05:21 PM
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Gears- there IS nothing else.

There is NO bang for the buck like gears in a 4x4. Actually, it shouldnt be considered an UPGRADE because if you are running 35s and NOT regeard you are running a broken rig.

Seriously- best $1,500 you will EVER spend. Im trying to convince myself I can do a HO swap for cheaper than gears in my 4.7 WJ.
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