We have a Hellwig rear sway bar on our Ram 2500. The stock bar that comes on the Ram is 0.875 inches in diameter while the Hellwig is 1.13 inches. At first I wondered how such a small difference in diameter could make such a difference and simply holding the two in my hand answered the question. The stock bar is actually hollow while the Hellwig is solid 4140 chrome moly steel which makes a HUGE difference. It has the three position adjustment at the bar ends to vary the amount of stiffness. I set it in the middle hole figuring I could adjust it in either direction should I need to. As it turned out I found it to be perfect just as it was. It does make a huge difference in minimizing lean angle while cornering and traversing uneven terrain.
This is the bar spec’d for the Ram 2500 …..
Hellwig rear sway bar
Neil & Yoly
2016 Ram 2500HD Tradesman, 2WD Crew Cab, 6.4L Hemi
2018 Travel Lite 840 SBRX