Why does my Jeep shake at 40 mph?

Knows a couple things... That steering wheel shake is absolutely definitely caused by a tire problem, as in a bad tire or an improperly balanced tire. Even if the tire was just balanced. Not many tire shops spend enough time to get tires balanced as well as the TJ requires.Sep. 21, 2017Steering wheel shakes bad at 35 to 40 mph | Jeep Wrangler Forum