I don't know the width of your 3800 but if it is like mine you might be able to mount the bar like this:

http://s729.photobucket.com/albums/ww296/BIGCHEVY3600/ANTI%20SWAY%20BAR/?

The 1/2 ton frame is 11" wider than the 3/4 ton and this presents a challenge for 3/4 ton owners to mount the bar. It can be done.


~Jim