First off a 3200 is a 1/2 ton long bed. A 3/4 ton is a 3600. The 1/2 ton had a foot engaged parking brake that used the rear brake shoes. 3/4 ton trucks with 3 speed trans used the same setup. The parking brake for the 4 speed on 3600 and up is a hand lever that activates a set of brake shoes on a cylinder in the driveshaft.

"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.