ZJ Frame Stiffeners 93-98 Jeep Grand Cherokee ZJ TNT Customs. Give your 93-98 Jeep Grand Cherokee ZJ some frame stiffeners! ZJs make great wheeling rigs but won't last long due to the unibody design. That is unless, you get some TNT ZJ frame stiffeners! These ZJ frame stiffeners are made from 3/16 steel and will help keep your body from flexing. Trouble opening doors and rear hatch, cracking, creaking, moaning, groaning, will be a thing of the past, and will keep your ZJ on the trail, for years to come!
