by mikekey » Fri Dec 06, 2013 9:45 pm
We need some more details to help you. First look in your glove box to find you gear ratio, and let us know what you have.
GU6 = 3.42, GT4 = 3.73, GT5 = 4.10
If you also see G80, then you have the GM standard "locker".
What size tire do you want to go up too? You should probably spend some time in the build threads. Some folks have been rolling around on their stock rear-ends for years without blowing them up. It just depends on your goals and level of aggressiveness off road. You have to decide what your mission with you vehicle is, in order to determine what parts are necessary.
If you've got 3.73's and you just want to roll around on 32's on gravel roads, a 3inch Lift Miester suspension lift plus 1.5inch spacers will do you just fine, combined with some armor for your oil pan and radiator.
Once lifted 03 Trailblazer on 35's, gave it up to travel the USA with my family.