I got this spring from ebay, and running @ 28PSI with the adjuster barely turned in. I think it's from a 95-96 7.4L, so this may not help unless you go higher than you mentioned....

Good you found them. I just couldn't believe I could buy them for $1.42 ea plus free shipping and, I have the Prime credit card so, I get 5% cash back, LOL.

Just got mine today...

https://www.amazon.com/s?k=R42LTS&ref=nb_sb_noss