It wouldn't be very difficult at all, just need someone who fabricates. You are thinking of the front crossmember, the rear crossmember is what drops the differential. It's sole purpose is to house the front diff assembly. Regardless, this will do nothing for your customers "ride", you need to look into some aftermarket coilovers, period if you want to rid of your shocks bottoming out. Unless your customers demands have changed this info is useless?

 

You should cover your *** and tell him anything you bolt onto your truck wont make any difference going over whoops in the sand dunes. If you offroad in sand dunes with a spacer you're an idiot. You would need a long travel suspension kit to make it better able to go over whoops.

 

if this guy is requesting a spacer kit he's not doing anything that would call for long travel. The shocks are bottoming out, that is his problem. My shocks too bottomed out stock so it's understandable.

 

I do believe the guy wanted to add a bigger spacer because his shocks were bottoming out driving over whoops in the sand dunes. Either he is trying to float them in which case you would need a long travel setup, but if he is driving slowly over them any kind of spacer would still make the shocks bottom out.

I have the procomp stage II with coilovers which are even the longer 4WD ones and they still bottom out when I am driving about 10mph over the whoops at Glamis' sand highway.

 

My donahoes bottom out when I jump them. If he were my customer I would recomend him the donahoes. I had them all now, stock with spacer, Bilsteins, Fabtechs, and donahoes, and the donahoes are night and day to anything else Ive tried. I spent the time and money to get custom spacers made just so I could still use them on my lifted truck. SAW are susposed to be shipping their F1 coilovers out by now, you can also give them a try with the rezzy, I only hear great things about them on the titan forums.