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I know, but the whistle gets so sharp at 15lbs and i feel as if i push much harder there will be tranny issues
The torqshift transmission is probably the part with the best reputation in that entire truck...
Mine has 220k hard miles on it, about 70k of those with a bully dog tuner torturing it and the only transmission issue I ever had was the temp sending unit went out.
The torqshift has been know to take 500hp with just a aftermarket TC. That's the last part of the 6.0 I'd be worried about. I've got a 04 single cab 2wd that I did heads and a full bulletproof on. Just haven't had time to get it all back together.
When I bought my excursion a few years ago, it already had the lift and what not, but the abs light was on when I first test drove it. The next day, they replaced the torque converter and the light went out. And that was at 147k miles