Okey dokey Rick, here we go. Ya gotta tell us what kind of tires ya got on there. If they are bias plies then that's your problem. I went all through this with my 1950, 3604 and there was a rather lengthy thread posted on the forum last fall.
I had 15" split rims that were in very nice condition, blasted and repainted with PPG two part taint. Mounted up 7.00x15LT Power King tires, tubes and flaps all were new and balanced them at three different dealers. The last one used the latest equipment that puts a load on the tire when they spin it up. New gas shocks all round and the front end completely, totally rebuilt and in it’s original configuration.
When I would start off in the morning the front clip looked like it was going to jump right off the frame. It took a bout five or ten miles of driving to round out the tires. If I parked it for a half hour while I ran into the Jewel I had the same problem till I was a few miles down the road. I tried tire pressures from 65psi down to 25psi, I tried putting a half-ton of sand bags in the back to see if some weight would help, NG.
In the end I finally threw in the towel and got a set of tubeless 16.5” rims and a new set of Cooper radials, vibration gone!
I still get a little cyclic shudder at around 45mph but I attribute that to the frames natural resonance and I think the only way to get rid of that is to box the frame between the cab and the box, where it is the weakest. This shudder is not there before 45mph nor after and it was also present with original tires, and the new bias plies at the same speed.
If you want avoid a lot of headaches and get over this 3/4 ton hurdle, call The Wheel Smith or Stockton Wheel, on Monday and have them make up four 15” wheels with the proper center and offset and you will be money ahead and ready for the summer driving season. Talked to literally hundreds of people that have been through this with the 3600 and that’s my conclusion.
Denny Graham
Sandwich, IL
