First, how do I go about figuring out what gears I currently have in my front end? Ive got a 93 Grand Cherokee, 4.0 litre automatic non-factory tow package. I read a FAQ post on Jeepforum.com and read that My D30 should have 3.55 gears. How do I find this out for sure? The reason I would like to know is that I just picked up an 8.8 today and it came with 3.55 gears so I was hoping to just get that rearend swapped in and save a little money on the re-gearing for the time being. This runs me into my next dilema, the gears with the 8.8 are not installed. How difficult is it to install gears? Are special tools needed? Or should I just leave the gear work to the pros?