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Author Topic: lifting jeep  (Read 399 times)

bunce

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  • Posts: 26
lifting jeep
« on: February 03, 2019, 12:04:53 PM »
Going to put a 21/2 in lift on a 2010JK. Also getting new rims and 35in tires. Somewhere I heard that I may have to change the gearing in the rear because of the larger tire size is this true? I have a 6 speed transmission if that makes any difference?

Old_Crow

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  • Posts: 1332
  • Phormer Phantom Phixer
Re: lifting jeep
« Reply #1 on: February 04, 2019, 07:34:39 AM »
Well, your speedometer is going to be off, and if my experience with an old 2.5l/5sp YJ is any indicator, 6th gear won't be of much use.  However, I'm sure there's plenty of people out there running 35's with stock gearing.

More important, if this Jeep is your toad, make sure the tow bar is sitting level when you're hooked up to the coach.  You might have to change the ball mount to a different one with less drop.
Wally Crow
Retired 30+ year ASE Master Auto Tech
Y2K Bounder 36S F53
'03 Jeep Wrangler Sahara
FMCA F494768

"Well, my time of not taking you seriously is coming to a middle."

dkreuzen

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  • Posts: 58
Re: lifting jeep
« Reply #2 on: February 04, 2019, 09:20:01 AM »
It depends on what gear ratio your JK has now. Here is a set of charts to help you decide.

https://prodigyperformance.com/blog/jeep-wrangler-gear-ratio-calculator/

Even if you start with a Rubicons 4:10 ratio you won't be using 6th gear much.
Dennis
2012 Monaco Knight 36PFT
2019 Jeep Grand Cherokee Overland
2005 Jeep Wrangler Unlimited Rubicon on 2007 16' Trailer

packnrat

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  • Posts: 44
Re: lifting jeep
« Reply #3 on: March 09, 2019, 07:41:34 PM »
not sure of the room on a jk. but for my cj-7, i run 35in mud tires. a 4 inch lift, with 4.10 gearing. this runs about stock. i only use a 4 speed box with compound low, no overdrive and 65 mph no problem, easy on the motors rpms.
but if your towing 4 down you are better off getting tires that are made for pavement not mud tires like i run. my jeep is just street legal, it lives for crawling on rocks.