2008I'd also like to add that 2 of my buddy's with 2006 lbz also with the six speed ruined their trannys with tunes only as well. It's roughly 5k to build one or 2600-2800 to build one yourself. (That's with a 400 dollar core on your torque converter)
Yea...your time is coming lol. They are pretty tough, but I don't haul shit and never pulled it...it took about a year or so of abuse then said fuck it. Roughly 30k miles after I installed efi live it started limping. I drove it pretty hard though.
That would give you more top speed, I don't think you're going to fit that small of a sprocket on the back though. What kind of hub are you running? If it's a stock hub I think the smallest you can go is 38 or 39 tooth.
I approve this message...if he doesn't know I'd pass. I have had many bikes over the years cost me more money they they are worth. Build your own, you will know what is done to it.