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What I am trying to figure out is what are the necessary modifications when running 35'' tires, Nth TT, and AEV Highline kit all on.
Drive shaft has to be replaced.
I am sure you had to change gear as well?
Depending on how much lift you are running you would need to change the driveshaft, and use a slip yoke eliminator kit. If you are staying under approximately 2" you should be ok without any driveline mods, but may need to trim some. In the past I think Nth has been aeound the 3.5" range and then you would have to make the driveline replacements. I know I have heard that you need a 1" body lift to run the Nth tummy tucker, and I have also heard you don't, but something to keep in mind. As for gears it would be prefferable to upgrade to 4.56 of 4.88 gears to maintain the driveability, but it isn't mandatory, and you are not going to hurt your vehicle by maintaining the stock ratios. You just will no longer have as quick of acceleration, and you will probably see a decrease in you mpg.
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