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Neatus · **Posted:** Mon Sep 03, 2007 8:26 pm

Can I install my rear end 4:10 gears and run them without changing the front gear set as long as I don't engage 4WD? Just want to get the rear done before I move. I am going to be towing a car across the country with the KJ. When I get to Phoenix I will do the front.

scrambledKJ · **Posted:** Mon Sep 03, 2007 9:04 pm

Yes you can, but I would pull out the front driveshaft in case someone else grabs the transfer case shifter

Jeepjeepster · **Posted:** Mon Sep 03, 2007 9:43 pm

^^, yup sure can.

Pulling the front shaft is a great idea.

SoDakJeep · **Posted:** Mon Sep 03, 2007 10:11 pm

what would happen if he had to differnt gears in the front and rear....haha

Dje Ryu · **Posted:** Mon Sep 03, 2007 10:28 pm

Wheels spin at drastically different rates. Bad for pretty much the whole thing; tires, tranny, t-case, just wouldn't be good.

SoDakJeep · **Posted:** Mon Sep 03, 2007 10:59 pm

thast what i thought just wasnt quite sure hahaha

elephantrider · **Posted:** Tue Sep 04, 2007 8:22 am

when you change the rear to 4.10's, what do you have to change the front to for the ability to run in 4x4 ?

scrambledKJ · **Posted:** Tue Sep 04, 2007 9:02 am

You will just have to change ring and pinion in the front afterwards to regain 4x4. I test drove a tahoe once with 4.56 in the rear and 4.10 in the front. The cusomer complained that it was chirping and jerky in 4x4. I thought the world was gonna end when I locked it in on blacktop. I regeared his read to match the front and sent him on his way.

elephantrider · **Posted:** Tue Sep 04, 2007 11:33 am

so if you put 4.10's in the rear, you have to put 4.10's in the front as well, correct ?

and doing that is $600 or so for both ?

tjkj, does that sound right ?

chefdab · **Posted:** Tue Sep 04, 2007 12:51 pm

Probably about $600 per axle. The ring and pinion plus install kit is about 250 per axle and you will pay handsomely for a proper install. This is one of those things you don't want to attempt on your own unless you're ASE certified.

tjkj2002 · **Posted:** Tue Sep 04, 2007 1:15 pm

jasonk wrote:

so if you put 4.10's in the rear, you have to put 4.10's in the front as well, correct ?

and doing that is $600 or so for both ?

tjkj, does that sound right ?

Your looking at more about $600 per axle at least unless you do the labor,expect the front to be more expense due to the added labor of removeing the front diff and reinstalling it,about a 8 hour job at best(have to pretty much remove the whole front suspension also).While swapping the gears don't forget to get master install kits(about $80-$120 depending on axle) and have all the seals and bearings replaced.The D30A does not have a master install kit so the parts have to be purchased seperatly which is more $$$,and D30 install kit will not work if I remember correctly.

LibertyFever · **Posted:** Tue Sep 04, 2007 8:49 pm

Is it really worth it? I mean you'll be changing from a 3.73 to a 4.10 ratio right? Will it make that much difference?

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