tarnold wrote:
Op here. Wish it was 1 3/8". But a '7604' Hellwig is only 1 1/8", never the less, bigger than stock.
Please let us know which chassis you're interested in a Hellwig bar for, and whether for front or rear.
We were thinking Ford E-Series, but I think I remember the Hellwig rear bar for Chevy 3500 being 1-1/2" also.
EDIT: Oh, E-350 with the 1992-2007 "Poke-In Ends". That's what we had and the Hellwig bar for that application IS 1-3/8". Your Hellwig rear bar should be 1-1/2".
Front installation does not poke into the axle. It looks like this:

The round hole in the axle is where the bushing for a bar like you now have is installed. The pad with surface rust and a bolt hole is what Ford added in 2008 when they abandoned the ineffective bar they used since 1992.
Roadmaster uses a more "elegant" mounting, but at half the price, Hellwig is completely satisfactory. We ran ours for several years on the original 2002 axle. It never worked loose or gave a problem. A few years ago, I installed a 2012 axle, switched the Hellwig to it, and it has again been fine.