Just went to 35's on my 87 Jimmy. I have the 350 EFI with a 700 R4. The gears are currently 3.42 which is too high for the tires. My truck is out of its powerband the majority of the time. Cruising around town, I am at about 1600 RPM. Great for gas mileage, horrible for power. Currently I have a factory Posi in my 10 bolt in back. I am most likely going to a 4.10 and looking to keep the Posi and 10 bolt. Up front I am thinking of a Posi also. Any other suggestions? Not for the gears as I am pretty sure that is what I am going to run, but for the axles themselves. Should I be considering a 3/4 ton axle or anything else?