"heavier truck" question...........

Been thinkin of putting a 5 or even 6 speed manual into the WWIII (01 2500 5.9 gas)

I know stuff like the heavy Chev trucks, 1 1/2 --2 ton, etc, came with some big gearboxes, BUT DID Dodge......"let's say"

..........an older, heavy truck with a 318 (maybe Poly) WITH AN SAE pattern bell?

Example, an Eaton - Fuller FS6406A 6 speed

00o0o_3POMlX4RTd_600x450.jpg