how can I strengthen unibody enough for diesel engine? found u-body stiffners & rock sliders that attach to stiffners(TNTcustoms) to help strengthen u-body but not sure if will be enough want the strength of a frame has anyone already done this & how? torn between 2 lifts right now tnt y-link & skyjacker rock ready but looking into clayton now. will be lifting in february so still have time to decide just won't to do it right 1st time & new to buildin 4x4's boughtmy blue 98 xj for $1000 bucks had only 162000 miles & min. rust will set up pics soon for before & after but out computer right now down to just phone

 

Look into build ups of jeepspeed xj's to get a better idea how they are reinforcing their trucks. That's where I'd start to get some ideas for your project

 

Here's an example http://www.jpmagazine.com/projectbui.../photo_05.html