Both will require shock mount and spring mounts I believe. Assuming both are known good axles.
And Chevy didn’t make 14bolts in 1968 afaik.
Bigger questions are gearing and how your gonna match the front axle so you don’t have an average of a 7 lug truck.
Tires with too much flex certainly would allow the tail to wag the dog more. You’re correct. I’m just not seeing it in this scenario. Not that it’s not possible or contributing. But the OP did not complain of the trailer swaying/wiggling. Plus he’s using a wdh with sway control. Should track...
The speculation in this thread has turned into a bit of a mess.
I’d say do this.
1. Front end alignment. Specifically caster.
2. Figure out your actual rear axle weight loaded. Then you can confirm or deny tire load rating. And you can test higher pressures for a practical verification...
Possibly. Although I’m not seeing 5klbs on the rear axle without the OP explaining why he’s using airbags to that extent or at all.
Nor am I seeing it possible to have anywhere near enough weight in the rear axle especially if the wdh is pulling any weight off. Those bags at 60psi will jack the...
As all is tight and new according to you, you may not have enough caster in the front end. Less caster = twitchy. Too much caster = heavy steering but tracks very straight. (Sort of. Not the full description). Seeing how you redid everything on the front, maybe caster angle is shy of what’s...
He never mentioned trailer sway although good point/reminder. Easiest way to correct trailer sway typically from not enough tongue weight (which is not the Ops issue) is applying trailer brakes while accelerating.
The definitive solution here is a decent set of tires. And maybe some front end work. Not sure how this relates to a totally restored squarebody and a trailer.
To that point, the best rotation is the one that keeps the treadwear even. Which barring alignment issues or correcting uneven tread depth is typically straight front to back. Because front tires feather or cup one direction and rear tires the other direction. X pattern doesn’t correct...
I was talking air bag pressure. But yes if you’re running 50psi or more in the rear tires of and empty pickup truck that is fine other than way more than needed. Rides rougher and worse traction. Look up a load pressure charts for your size tires and compare to the 2500/3klbs rear axle weight...
Based on your posts after this, idk if the steering has anything to do with the trailer. But assuming you know your tongue weight which seems you do, I cannot begin to understand how you can need 60psi in the bags. Or even 1psi. Unless you have 20 sacks of concrete in the back of the burb...
While it’s possible the tires are a contributing factor, first off you didn’t mention trailer sway or wiggle which is where some of the responses are leading.
But your numbers above don’t make sense at all unless you have a VERY nose heavy trailer.
If you need 60psi in the bags on top of 3/4 ton...