Well.... I have found out that my gears are way too high for my tires.. I have a 78 Chev K10, 350/350/203 Dana 44 front 12 bolt rear 36 inch TSL's I haven't actually counted teeth yet, but with the RPM vs. Speed, I would say they are 3.08's or maybe 3.43's or something. I get about 2000 RPM at 60 mph, and that is ALL it will pull, unless I am going downhill I was looking up aftermarket gears, and I keep seeing "case change" at 3.73 for both axles.. is this right? Does that mean I can't go to the 4.56's or 4.88's that I need? unless I change the whole axle? Also, what harm will it do to run around town in low range on the 203? I do have a part-time kit installed, I did find that out this weekend.. Thanks, great site!!