Crawled under my 1997 GBM with F-53 chassis this morning to check the sway bar bushings. Found out that the bushings were Ok, but what a surprise when I found that it had air bags installed on the rear. I was going to make a Trac Bar (Pan Hard Bar), but am not so sure now until I hook up my toad put some air in the bags and see how she tows and rides. I still might make the Track Bar come spring. I noticed the differential is solid in the front. (no bolts) the only bolts are on the back of the differential. I doubt if that will make much difference to install a trac bar. The front has a steer safe. We are getting ready to take about a 2000 mile trip in a few days, so that will tell me if I need anything more as far as suspension on my F-53 Chassis. BTW I was also checking the sway bars to see if they had a second set of holes for the CHF (cheap handling fix) Mine do not have the second holes in them.