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axle wrap is caused when the trucks rear axle tries to basically rip itself out towrds the fron of the truck. as you give the truck gas your tires spin and it pushes your axle forward..this motion is passed on to yout truck through the leafsprings and then the frame. it you look at jet techs pic it shows a really good example of axle wrap. the problem is by adding the block in the rear you just extended the torqe arm for the axle to pull on the leafs. imagine trying to turn a nut by hand.....at some point it gets tight and you cant turn it anymore so you go get a ratchet handle, this extends the torque arm and allows you with minimal effort to turn the nut. adapt the same principle to your leafs/axle. the axle is trying to turn itself up and push forward. we already have a small issue with this with stock trucks because the titan has so much power. now just like the ratchet example by adding the 4 inch block you just extended the axles torque arm so now it has even more torque on the leafs. this will cause it to "wrap" 4 times more than it did when stock. and let me tell you on my old f 150 we put it on a dyno and it had a 4 inch block on the back and you wouldnt believe how far the axle wrapped forward and upward.....and that a truck with on ly 230 hp.....add 70 hp and lookout ur gonna have axle wrap. this can easily be fixed with traction bars and if your truck is lifted i wouldnt suggest the jet tech mod. it is great for stock trucks and i have it on mine but when you lift it you really need a traction bar it will really help.
hope i explained it ok let me know if you have any other q's
alright later
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