Hope this helps a bit.
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1947 Second Series - New styling, 5-slat horizontal grille.
Vents on side of cab.
No vent windows in doors.
"Thriftmaster" or "Loadmaster" badging on side of hood.
1948 - New foot-operated parking brake.
1949 - Inner bar of grille painted silver-gray.
Series number badging (3100, 3600, 3800) on side of hood.
Gas tank moved inside cab to behind seat (filler cap on passenger side of cab)
1950 - No major exterior changes. Only major change is to tubular type shock absorbers.
1951 - Vent moved from side of cab to top of cowl.
Doors now have vent windows.
1952 - Speedometer top speed changed from 80 to 90 MPH, high-beam indicator moved to top, from the bottom of the speedometer gauge.
Door handles changed from turn-handle to push-button.
1953 - badging restyled, side badging lost "Chevrolet" (now only has the series number).
Door Post ID plate is blue & silver instead of black & silver.
1954 - new "tubular" grille, painted body color with white lettering.
New one-piece front windshield.
New front emblem (no writing, bowtie and "wings" only).
New bed - 2" lower loading height, 90 degree bed sides (instead of 45 degree bed sides), new tailgate latch.
1955 First Series - grille is painted ivory with black inner bars and black lettering (optionally, lettering can be ivory).
Open driveline (instead of the closed torque-tube, which had been used since the 1930's)
