gears?????? - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 8 (permalink) Old 03-11-2010, 10:49 AM Thread Starter
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gears??????

if their is already a thread then whoops
ok so is their an ability to upgrade gears on the XK ?
i have the 3.7 and i would like to do this but is it eaven possible ?
how much higher can i go and do i need to do the front also to mach the rear?
what is all needed for this and would it be cheeper to get another jeep and leave my XK alone.
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post #2 of 8 (permalink) Old 03-12-2010, 03:59 PM
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If it is 4WD you will need to do the front and rear together or else stay out of 4WD... not sure if that's possible on most commanders they seem to have a mind of their own.

You can definitely go up to 3.73 as this is used stock, but 4.11's would probably be more worth the effort if they are available.

-Tom
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post #3 of 8 (permalink) Old 03-12-2010, 04:05 PM
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I forgot to mention price - gears are usually relatively cheap, say $150 - 200 per axle. However, you will need to have them installed .... not sure what that will cost as I always do things myself (but have yet to attempt gears)

The speed gauge and sensors will also have to be adjusted unless you can live with the speedometer being 10-20% off. Larger tires will cause this as well. I assume you are looking for more power and therefore would want to stick with the current tire size. Otherwise, everything would balance out and be a wash.

-Tom
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post #4 of 8 (permalink) Old 03-12-2010, 04:19 PM
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Installing gears is not a do it yourself project without lots of experience. They have to be shimmed and the mesh patterned adjusted. I had 373 gears installed on my Mustang bracket race car and the fellow who did it took his time and believe me it was not a novice type project.

2007 Jeep Green Limited 4.7 Flex Fuel, RR 2.5" 4 inch Superlift coils on rear, 1.5" Spacers, Bridgestone 265/70/17, K&N CAI, Flowmaster, Diamond Plate Locking Trunk, Blue Ox Baseplate w/D-rings, "Get Lost 4X4" Front Bumper, T-Max 9000 winch, "Get Lost rear tire carrier, 30 gal second gas tank.
Second 2007 Jeep Green Limited Leather HEMI QDII VES Uconnect Flowmaster OEM Skids Tow Package

Maybe the two will meet up soon edit: they did , I now have 2,now gave 1 away...and got it back again.
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post #5 of 8 (permalink) Old 03-12-2010, 04:37 PM
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I agree with that.... but it's not a real big job either (for a professional) and the parts are relatively cheap. Any 4WD shop could price it out real quick, they do this sort of thing all the time.

-Tom
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post #6 of 8 (permalink) Old 03-12-2010, 08:03 PM
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Currently there aren't any gear upgrades for the WK/XK except what comes from the factory. 3.73's the highest ratio available.

2006 XK Sport, 4.7l, QTII- many mods
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post #7 of 8 (permalink) Old 03-17-2010, 04:06 PM Thread Starter
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thanks guys

so are the 373's what is on my 3.7 lt. or is what comes on the hemi....and ya i will be going with 32's but i also want it not to do a burnout on the trail but actually crawl up it ....thanks again ....

i also asked if it wr possible to get a 4" lift and add it to my already 2" but i forgot where i placed that Q?
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post #8 of 8 (permalink) Old 03-19-2010, 09:50 AM
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With 32 on a 3.7 Commander you'll be lucky to do a burnout on ice....

The 3.7 with 3.73 gears works well in my wife's Liberty with stock tires and even has some guts up to about 40mph. After 40mph the guts start to fade and by 60mph they are definitely gone.

Now consider that the Commander adds about 1000lbs and you are upping the tire size by a good 3 inches.... I think burnout's will be the least of your worries, but if you are still concerned keep the standard gears.

-Tom
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