Front lockers have been discussed, you can use the find at the top. Essentially, the half shafts aren't up for a front locker. You'll need a solid front axle to really be able to do it.
The rest is a can of worms one could write a book on. You'll have to look at the big picture. If you are towing anything, yes tires will make a difference the stock '33s are pretty hard and don't grip as well as I would like. Dealerships here also pretty much only carried automatics... I would have preferred a manual, but finally went with the automatic because of traffic in this area and it had something like 1000 lbs greater towing capacity than the manual... Havn't been roading with a manual so can't really compare the two... I've got the stabilitrac wich seems to work well. Manuals do make the thing feel a little more zippier. If you are going to be roading with jeeps I'd get a 3, if you are going to be roading with other full sized vehicles get the 1. But then again you can buy two 3's for the price of a one year or two old 1. I don't think you will have that much of a noticable difference with the 3.7 opposed to the 3.5 liter except the larger engine is probably going to be more expensive and your fuel economy will be less. If speed, engine displacement, and manueverablility are even remote considerations, I'd give it a long hard thought. This is not exactly the first choice someone might have to take drifting. It can get down right claustrophobic if you roadtrip and don't have the sunroof. I've taken mine from Seattle to Denver and fixing to take it from Seattle to DC... it can get downright cramped after about 20 hours in the saddle so there is that as well. But ultimately its a hummer and I don't think with any hummer you can really go wrong.
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