Excuse my ignorance, but what is the TM, and what does it do? I know gears and a tune is really what I need, but until I can come up with the money, I was just going to see if there's a cheap fix for now. It's just aggravating knowing the power potential of even a stock truck, but the computer won't allow it to spin tires or even do a full throttle take off. I know it's "tuned" that way from the factory so the yuppies and soccer moms don't kill themselves.

Also, what gears are most of you guys running? I've got 3.23's now. I'm not sure if I would tell a big enough difference with 3.73's, but don't really want to run 4.10's. I think I saw somewhere that a 3.90 gear is available. Anyone running a 3.90 gear?

One more question. Short of calling and bugging the crew at Nelson, what are my tune options from Nelson? I don't want to be limited to 93 octane fuel and I really just want my engine to run to it's potential and have a proper gear shift from the trans.