Other than wear and tear on the front driveline and a little worse mileage, I can't think of a reason.

I leave it in full-time basically full-time. The only time I take it out is if I NEED the tires to spin or I'm diagnosing something in the driveline... or if I put it in part-time or low range off-road. Handling is far superior. Traction is noticeably better in every condition (including dry pavement).

As for premature tire wear...seriously? If you are driving hard enough that having driven front wheels significantly shortens your rotation period vs rear-wheel only then you're not driving the right vehicle. Frankly, hard braking and turns on pavement does the most to wear tires than anything except a bad alignment. 5-tire rotation is the way to go at every oil change.

As for extra wear on the front driveline components...well...maybe so since there's a torque load on them instead of freewheeling, but then you can argue there's that much LESS in the rear, so out back wear will be DECREASED accordingly. I frankly think it's a wash but I like having all the moving parts moving and getting lubricated evenly instead of having certain joints go unused...until you need them.

Dan

The traction thing, i think, is especially critical on the CRD's where we can make a mountain of torque fairly quickly. If I come out of an intersection a little hard I can spin the rear tire really quick and then I am sitting there waiting for the ESP to "save" me as I am about to get T-boned. The full time keeps it from ever engaging ESP.

Sounds more like you need better tires.

I can roast the rears on command with my 3.7 gas KJ that weighs 2000lbs(49%/51% weight split via weigh scale,so more rear weight) more then your CRD and with 35" tires,granted that's with Destination MT's.100% more traction when I bolt on my MT/R K's which are actually a little narrower then the Destinations(35x12.50x15 MT/R K's vs 315/75R16 Destinations).The MT/R's are also about 10lbs light per tire and the rims are about 6lbs lighter (15x8 vs 16x10).

LOL, we are not driving gassers, we are driving torquemonsters.

I have spun Michelins, Bridgestones, Wranglers with out even trying.

I leave it in full-time basically full-time. The only time I take it out is if I NEED the tires to spin or I'm diagnosing something in the driveline... or if I put it in part-time or low range off-road. Handling is far superior. Traction is noticeably better in every condition (including dry pavement).

As for premature tire wear...seriously? If you are driving hard enough that having driven front wheels significantly shortens your rotation period vs rear-wheel only then you're not driving the right vehicle. Frankly, hard braking and turns on pavement does the most to wear tires than anything except a bad alignment. 5-tire rotation is the way to go at every oil change.

As for extra wear on the front driveline components...well...maybe so since there's a torque load on them instead of freewheeling, but then you can argue there's that much LESS in the rear, so out back wear will be DECREASED accordingly. I frankly think it's a wash but I like having all the moving parts moving and getting lubricated evenly instead of having certain joints go unused...until you need them.

Dan

LOL, we are not driving gassers, we are driving torquemonsters.

I have spun Michelins, Bridgestones, Wranglers with out even trying.

In hi range(2wd) starting from a dead stop my KJ is putting 3616lbs-ft of torque to the rear wheels,yours is putting 3301lbs-ft. Just saying

According to Keith, the full torque Eco outs 335 with tc on lockup at flywheel, so at wheels it's probably about 20%less. Unless you put that hemi in yours, or did some serious mods, I don't think you get 360 at wheels (figured 3616 is a typo, unless you have a train tractor diesel engine on that bad boy, lol). But I do believe you can spin the wheels, I can do that on the Cherokee with 31 inch tires and still 3.55 Diff gear ratio. Btw, what gearing do you have for the 35 inch tires? 4.10 or lower?

In hi range(2wd) starting from a dead stop my KJ is putting 3616lbs-ft of torque to the rear wheels,yours is putting 3301lbs-ft. Just saying

I am running the hot tune, and no gasser puts out its full torque under 2000 RPM.

Wind that sucker up if you want some torque. So you must be taking off pedal to the metal.

Either you can drive a CRD or just talk about them like you do.