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Ok, For some reason when I'm in 4 Wd especially 4 lo my 08 2dr will kind of buck while in backing up. Definitely feels drive train related. I installed a coast driveshaft in the front and I'm still stock in the rear.
I have a 4" rancho lift with control arm relocation brackets in the front and the previous owner used cams in the rear.

Oh its a manual transmission too. Any ideas as to why this happens? Is just a 4 lo thing? Sure feels like something is binding.

Thanks for any help.
 

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Because of the gear reduction through the transfer case in 4LO. Reverse gear is about 4.060:1. In 4LO multiply this by the transfer case ratio of 2.78 and the result is a 11.28 gear ratio. With a Rubicon it would be 16.24. Step on the throttle and a burst of torque goes thru the drivetrain, hence the bucking.
 

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Yup, learn to feather the skinny pedal as needed.
 
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