"...if that is true why did the truck manufacturers change over to the modern IFS suspension aystems on their newer trucks."

Could it be so they'd ride like a car so they could sell more trucks to people who don't like the way old trucks rode?

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.