even with these 35's no no no... As you can see I'm obviously going FAST.
Oh, fer cryin' out loud... . I have 3. 73's, and have seen 105MPH rather easily, with more to be had (common sense prevailed, fortunately). That's with a 654rev/mile tire, and 3. 73 gears - top speed of 114MPH (or so). With your 601rev/mile tire, and 4. 10 gears, you top out at 113MPH. 3. 73's would give you a top speed of 124MPH.
So... I have to ask: if 113MPH isn't enough, and 124MPH isn't enough, just exactly how quickly do you want to kill yourself?
Seriously... . you're an 18 or 19 year old kid who doesn't have enough driving experience to realize that you have NO business running a vehicle like yours at those speeds, REGARDLESS of where you're running it. You have a stock truck, with a stock suspension (those spacers don't do a darn thing expect make it less stable), oversized tires (that aren't rated for that speed - have you ever seen a tire come apart because it was ran too fast? I have... it's not pretty), an altered (for the worse) center of gravity, and a driver behind the wheel that most likely couldn't even handle a properly-designed vehicle at those speeds should it develop a problem. I'm not saying this to put you down, Nick - it's the truth, and would apply to just about anyone else your age, save maybe someone like Adam Petty. Remember what happened to him???
And I'm not even going to address the "make your own gears" thing... .
-Tom