Here is just a few more things I could think of
1948 fule tank was under the bed
1953 in the cab
1948 left hand side vent on cowl
1953 wing vents (as stated before)
1948 speedo went to 80 mph
1953 speedo went to 90 mph
1948 temp gauge went to 212 deg
1953 temp went to 220 deg
1948 needles were red (Chevy
1953 needles were white (Chevy)
1948 radio the back cover was slanted
1953 radio the back cover was stright
1948 stock could have chrome hubcaps, bumper and/or grill
1953 would of been painted
1948 window crank knobs and wiper knob on dash would of been crome with stainless trim over radio speaker grill with stainless glove box
1953 window crank knobs and wiper knob on dash with would of been maroon nonmetal and painted upper & lower trim on speaker grill along with glove box door