or a transfer case drop which lowers the transfer case skid plate. the sye kit requires a new driveshaft for the rear or you can grab a front xj driveshaft (auto trans) as a cheaper alternative.
You won't know if you have vibrations till after you lift.
Another important part you will need is extended brake lines. The front hard lines can be bent down for added length and the rear line can be replaced with a 1995 Jeep YJ wrangler brake line or dodge dakota line. Both are 3" longer and bolt right in.
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