I really need information on the GMC trucks!  I've only built 3 that I can recall.  Most of what I build is made up of several different years by the time it gets to me so I'm no expert on exact details.
 

 Additional vehicle information can be obtained through your VIN # located on the drivers side door jam.

The site at American Classic can provide you with information regarding the following codes:

• Plant of Manufacture
• Color
• Model
• Engine
• Transmission
• Axle

Another similar site as American Classic's is Don Moen's Serial Number  page.
 

Order the Free Chevrolet Restoration Packet to learn Ton's of Stuff about the AD's

This is the ultimate reference material for your truck.  It includes information regarding vehicle weight series, dimensions, colors and optional equipment etc.

Chevrolet Customer Assistance Center
Chevrolet Motor Division
General Motors Corporation
 P O Box 7047
Troy, Michigan  48007-7047
 

Ordering a GMC Restoration Packet for the Canadian Model

Unlike the Chevrolet Restoration Packet which is Free, the GMC Packet Cost is $25.00

I have not ordered a packet so I have no knowledge of how much information is provided.  If anyone has first hand knowledge on the Canadian Packet I would like to hear what it contains and if you were pleased with the information.

1947:

• A drivers side vent located on the cowl just in front of the door.  Vent handle is Maroon.
• One piece door glass
• Split view windshield
• Lever action door handles
• Hood front emblem is "Die Cast Metal"
• Hood side emblems will say "CHEVROLET" in large letter and Thrift master or Load Master in smaller letters.
• Gas tank under bed & filler tube was located on the passenger side of the bed in front of the rear fender
• Bed side rails are angled
• Beds will have 9 Boards
• It also came with lever action shocks
• The firewall is basically flat with few strength ribs.  To reduce flexing of the Firewall sheet metal, GM spot welded two vertical Channels, 11 1/2 inch x 16-3/4 inch to the inside
• The upper cowl section between the rubber hood lace and vertical firewall panel is flat "NO WATER DRAINAGE GROVE"
•  No hump in the lower part of the dash above the steering column because they used floor shift 3 or 4 spd transmission only.
• Emergency brake is a lever action handle mounted on the floor next to the shifter
• The seat adjustment mechanism is cable operated
• Horn mounted on intake manifold
• Cab has three mounting points.  Two large bolts go in each front floor corner into large cupped washers, through the floor and brace that's riveted to the frame.  Their should be a rubber spacer between the cab and frame mount.  The rear mount is located in the center of the cab.
• Cab wind lace channel around door opening secured with screws.
• Dash panels stainless steel or chrome plated (glove box, center section, gauge housing, ash tray knob, wiper knob and emergency brake knob)
• Headliner center bow is secured to cab with screws "Non Floating"
• Door post ID plate is black & silver.
• Speedometer:
• Needle color is Orange
• Mph went up to 80 mph.
• High Beam indicator is located on the bottom center below needle
•  Engine was the famous 216 identified by the center hold down studs on the valve cover.
•  Brakes:
• called Huck Brakes which were drum shoes of course
• Identified by the brake adjusters located on the wheel cylinders.

1948:  * Denotes Changes From Previous Year

• A drivers side vent located on the cowl just in front of the door.  Vent handle is Maroon.
• One piece door glass
• Split view windshield
• Lever action door handles
• Hood front emblem is "Die Cast Metal"
• Hood side emblems will say "CHEVROLET" in large letter and Thrift master or Load Master in smaller letters.
• Gas tank under bed & filler tube was located on the side of the bed in front of the rear fender
• Bed side rails are angled
• Beds will have 9 Boards
• It also came with lever action shocks
• The firewall has added strength ribs and the elimination of the inner two vertical U-Channels. ***
• The water drain was added to the upper cowl section between the rubber hood lace and vertical firewall panel *******
• Hump added in the lower part of the dash above the steering column for column shifter   *****
• Emergency brake relocated to floor next to drivers kick panel and now is foot operated  ******
• The seat adjustment mechanism is cable operated
• Horn mounted on intake manifold Horn mounted on intake manifold
• Cab has three mounting points.  Two large bolts go in each front floor corner into large cupped washers, through the floor and brace that's riveted to the frame.  Their should be a rubber spacer between the cab and frame mount.  The rear mount is located in the center of the cab.
• Cab wind lace channel around door opening secured with screws.
• Dash panels stainless steel or chrome plated (glove box, center section, gauge housing, ash tray knob, wiper knob and emergency brake knob)
• Headliner center bow is secured to cab with screws "Non Floating"
• Door post ID plate is black & silver.
• Speedometer:
• Needle color is Orange
• Mph went up to 80 mph.
• High beam indicator located in the center of the housing below the speedometer needle.
• Engine was the famous 216 identified by the center hold down studs on the valve cover.
• Brakes:
• called Huck Brakes which were drum shoes of course
• Identified by the brake adjusters located on the wheel cylinders.

1949:  * Denotes Changes From Previous Year

•  A drivers side vent located on the cowl just in front of the door.  Vent handle is Maroon.
•  One piece door glass
• Split view windshield
• Lever action door handles
• Hood front emblem "Chrome plated" ***********
• Hood side emblems consist of (2) emblems:
•  1 larger emblem will say Chevrolet
•  Smaller number emblem designates the series weight 3100 For 1/2 tons, 3600 For 3/4 tons, 3800 for 1 tons" ******
• Gas tank relocated inside the cab behind the seat.  Filler tube located on passenger side of cab ****
• Bed rails that are angled
• Beds will have 9 Boards
• It also came with lever action shocks
• The firewall has added strength ribs and the elimination of the inner two vertical U-Channels.
• The water drain is present on the upper cowl section between the rubber hood lace and vertical firewall panel
• Hump in the lower part of the dash above the steering column for column shifter
• Emergency brake located on floor next to drivers kick panel and now is foot operated
• The seat adjustment mechanism is cable operated
• Horn mounted on intake manifold
• Cab has four mounting points.  Two large bolts go in each front floor corner into large cupped washers, through the floor and brace that's riveted to the frame.  Their should be a rubber spacer between the cab and frame mount.  The rear mount is located in each rear corner behind the vertical strength plate welded to the floor.  It consists of swivel supports with 4 bushing per side and bolts with (2) bolts to the floor and (2) bolts to the frame. ******
• New Cab windlace channel spot welded in place around door opening. ***********
• Dash panels stainless steel or chrome plated (glove box, center section, gauge housing, ash tray knob, wiper knob and emergency brake knob)
• Headliner center bow is Floating type now "Not screwed into place" *************
• Door post ID plate is black & silver.
• Speedometer:  ********
• Needle color changed from Orange to White
• Mph went up to 80 mph.
• High beam indicator located in the center of the housing below the speedometer needle.
• Engine was the famous 216 identified by the center hold down studs on the valve cover.
• Brakes:
• called Huck Brakes which were drum shoes of course
• Identified by the brake adjusters located on the wheel cylinders.

1950:   *  Denotes Changes from Previous Year

•  A drivers side vent located on the cowl just in front of the door.  Vent handle is flat metal ****
•  One piece door glass
• Split view windshield
• Lever action door handles
• Hood front emblem is chrome plated steel.
• Hood side emblems consist of (2) emblems:
•  1 emblem will say Chevrolet
•  Smaller number emblem designates the series weight 3100 For 1/2 tons, 3600 For 3/4 tons, 3800 for 1 tons"
• Gas tank relocated inside the cab behind the seat.  Filler tube located on passenger side of cab
• Bed rails that are angled
• Beds will have 9 Boards
• The installation of tube shocks with riveted on shock brackets ******
• The firewall has added strength ribs and the elimination of the inner two vertical U-Channels.
• The water drain is present on the upper cowl section between the rubber hood lace and vertical firewall panel
• Hump in the lower part of the dash above the steering column for column shifter
• Emergency brake located on floor next to drivers kick panel and now is foot operated
• Last year seat adjustment mechanism being cable and pulley arrangement
• Horn mounted on intake manifold
• Cab has four mounting points.  Two large bolts go in each front floor corner into large cupped washers, through the floor and brace that's riveted to the frame.  Their should be a rubber spacer between the cab and frame mount.  The rear mount is located in each rear corner behind the vertical strength plate welded to the floor.  It consists of swivel supports with 4 bushing per side and bolts with (2) bolts to the floor and (2) bolts to the frame.
• New Cab wind lace channel spot welded in place around door opening.
• Dash panels stainless steel or chrome plated (glove box, center section, gauge housing, ash tray knob, wiper knob and emergency brake knob)
• Headliner center bow is Floating type now "Not screwed into place"
• Door post ID plate is black & silver.
• Speedometer:
• Needle color is White
• Mph went up to 80 mph.
• High beam indicator located in the center of the housing below the speedometer needle.
• Engine was the famous 216 identified by the center hold down studs on the valve cover.
• Brakes:
• called Huck Brakes which were drum shoes of course
• Identified by the brake adjusters located on the wheel cylinders.

1951:  *  Denotes Changes from Previous Year

• No drivers side vent located on the cowl in front of the door *****
• Only year to have a vent wing window in the door and lever action door handle *****
• Split view windshield
• Last year for lever action door handles *****
• Hood Front Emblem is Stainless Steel
• Hood side emblems:
• In late 1951 they dropped the 3100 and only had the Chevrolet emblem.
• Gas tank located inside the cab behind the seat.  Filler tube located on passenger side of cab
• Bed side rails are angled
• Early 1951 Beds will have 9 Boards.  Late 1951's bed wood changed to only 8 boards. ****
• The installation of tube shocks with riveted on shock brackets
• The firewall has added strength ribs and the elimination of the inner two vertical U-Channels.
• The water drain is present on the upper cowl section between the rubber hood lace and vertical firewall panel
• Hump in the lower part of the dash above the steering column for column shifter
• Emergency brake located on floor next to drivers kick panel and now is foot operated
• The seat adjustment mechanism is a plain 1/8" rod secured to seat frame with rubber plug. ***
• Horn mounted on intake manifold
• Cab has four mounting points.  Two large bolts go in each front floor corner into large cupped washers, through the floor and brace that's riveted to the frame.  Their should be a rubber spacer between the cab and frame mount.  The rear mount is located in each rear corner behind the vertical strength plate welded to the floor.  It consists of swivel supports with 4 bushing per side and bolts with (2) bolts to the floor and (2) bolts to the frame.
• New Cab wind lace channel spot welded in place around door opening.
• Dash panels stainless steel or chrome plated (glove box, center section, gauge housing, ash tray knob, wiper knob and emergency brake knob)
• Headliner center bow is Floating type now "Not screwed into place"
• Door post ID plate is black & silver.
• Speedometer:
• Needle color changed from Orange to White
• Mph went up to 80 mph.
• High beam indicator located in the center of the housing below the speedometer needle.
• Engine was the famous 216 identified by the center hold down studs on the valve cover.
• Brakes: *********
• Changed to separate adjusters independent of the wheel cylinders.

1952:   *  Denotes Changes from Previous Year

• No drivers side vent located on the cowl in front of the door *****
• Wing Vents windows on the doors
• Split view windshield
• First year for push button door handles *****
• Hood side emblems:
• In late 1951 they dropped the 3100 and only had the Chevrolet emblem.
• Gas tank located inside the cab behind the seat.  Filler tube located on passenger side of cab
• Bed side rails are angled
• Beds has 8 boards installed
• The installation of tube shocks with riveted on shock brackets
• The firewall has added strength ribs and the elimination of the inner two vertical U-Channels
• Last year Horn "Tube Coil Design" mounted on intake manifold.  1st year to use a horn relay ****
• The water drain is present on the upper cowl section between the rubber hood lace and vertical firewall panel
• Hump in the lower part of the dash above the steering column for column shifter
• Emergency brake located on floor next to drivers kick panel and now is foot operated
• The seat adjustment mechanism is a plain 1/8" rod
• Horn mounted on intake manifold
• Cab has four mounting points.  Two large bolts go in each front floor corner into large cupped washers, through the floor and brace that's riveted to the frame.  Their should be a rubber spacer between the cab and frame mount.  The rear mount is located in each rear corner behind the vertical strength plate welded to the floor.  It consists of swivel supports with 4 bushing per side and bolts with (2) bolts to the floor and (2) bolts to the frame. ******
• Cab wind lace channel spot welded in place around door opening.
• Dash panels now steel and painted. "Due to war and shortages"
• Inside window handle knobs & wiper knob are now maroon.
• Headliner center bow is Floating type now "Not screwed into place"
• Door post ID plate is black & silver.
• Speedometer:
• Needle color changed from Orange to White
• Mph increased to 90 mph ******
• High beam indicator relocated in the center of the housing above the speedometer needle ****
• Engine was the famous 216 identified by the center hold down studs on the valve cover.
• Brakes:
• Changed to separate adjusters independent of the wheel cylinders.

1953:  *  Denotes Changes from Previous Year

• No drivers side vent located on the cowl in front of the door
• Wing Vents windows on the doors
• Split view windshield
• Push button door handles
• Hood side emblems was redesigned to large numbers to indicate the model "3100, 3600 etc.," ****
• First year to have indented passenger rear fender for side mounted spare tire ******
• Gas tank located inside the cab behind the seat.  Filler tube located on passenger side of cab
• Bed side rails are angled
• Beds with 7 skid strips installed or 8 boards.
• The installation of tube shocks with riveted on shock brackets
• The firewall has added strength ribs and the elimination of the inner two vertical U- Channels
• Last year Horn "Tube Coil Design" mounted on intake manifold.  1st year to use a horn relay ****
• The water drain is present on the upper cowl section between the rubber hood lace and vertical firewall panel
• Hump in the lower part of the dash above the steering column for column shifter
• Emergency brake located to floor next to drivers kick panel and now is foot operated
• The seat adjustment mechanism is a plain 1/8" rod
• Horn mounted on intake manifold
• Cab has four mounting points.  Two large bolts go in each front floor corner into large cupped washers, through the floor and brace that's riveted to the frame.  Their should be a rubber spacer between the cab and frame mount.  The rear mount is located in each rear corner behind the vertical strength plate welded to the floor.  It consists of swivel supports with 4 bushing per side and bolts with (2) bolts to the floor and (2) bolts to the frame.
• Cab wind lace channel spot welded in place around door opening.
• Dash panels now steel and painted. "Due to war and shortages"
• Headliner center bow is Floating type now "Not screwed into place"
• Door post ID plate is now blue & silver. Prior years were black & silver.
• Speedometer:
• Needle color changed from Orange to White
• Mph increased to 90 mph ******
• High beam indicator relocated in the center of the housing above the speedometer needle
• Engine was the famous 216 identified by the center hold down studs on the valve cover.
• Brakes:
• Adjuster no longer on wheel cylinders.

1954:  (Major Changes made from the 1953 Model)

• No drivers side vent located on the cowl in front of the door
• Wing Vents windows on the doors
• Push button door handles
• Large Hood side emblems numbers to indicate the model "3100, 3600 etc.,"
• Indented passenger rear fender for side mounted spare tire
• Gas tank located inside the cab behind the seat.  Filler tube located on passenger side of cab
• Bed rails that are flat ******
• Beds wood contains 8 boards.
• Automatic Transmissions available along with a rare open drive line rear end *******
• The installation of tube shocks with riveted on shock brackets
• The firewall has added strength ribs and the elimination of the inner two vertical U- Channels
• One piece front windshield ********
• Horn operates with a horn relay
• The water drain is present on the upper cowl section between the rubber hood lace and vertical firewall panel
• Hump in the lower part of the dash above the steering column for column shifter
• Emergency brake located on floor next to drivers kick panel and now is foot operated
• The seat adjustment mechanism is a plain 1/8" rod
• Horn mounted on intake manifold
• Cab has four mounting points.  Two large bolts go in each front floor corner into large cupped washers, through the floor and brace that's riveted to the frame.  Their should be a rubber spacer between the cab and frame mount.  The rear mount is located in each rear corner behind the vertical strength plate welded to the floor.  It consists of swivel supports with 4 bushing per side and bolts with (2) bolts to the floor and (2) bolts to the frame.
• Cab wind lace channel spot welded in place around door opening.
• Headliner center bow is Floating type now "Not screwed into place"
• Door post ID plate is now blue & silver.
• Rear bumper redesigned with drop in center to make viewing license plate easier.
• Speedometer: ************
• New Design with short dual arm needle and different face.  All other gauges different then previous years.
• Mph went up to 90 mph.
• High beam indicator located in the center of the housing but now above the speedometer needle.
• Engine was the famous 235 identified by NO center hold down studs on the valve cover
• Brakes:
• separate adjuster no longer on wheel cylinders.
 

1955:  (Changes made from the 1954 Model)

• No drivers side vent located on the cowl in front of the door
• Wing Vents windows on the doors
• Push button door handles
• Large Hood side emblems numbers to indicate the model "3100, 3600 etc.,"
• Indented passenger rear fender for side mounted spare tire
• Gas tank located inside the cab behind the seat.  Filler tube located on passenger side of cab
• Bed rails that are flat ******
• Beds with 7 skid strips installed
• Automatic Transmissions available along with a rare open drive line rear end
• The installation of tube shocks with riveted on shock brackets
• The firewall has added strength ribs and the elimination of the inner two vertical U- Channels
• One piece front windshield ********
• Horn operates with a horn relay
• The water drain is present on the upper cowl section between the rubber hood lace and vertical firewall panel
• Hump in the lower part of the dash above the steering column for column shifter
• Emergency brake located on floor next to drivers kick panel and now is foot operated
• The seat adjustment mechanism is a plain 1/8" rod
• Horn mounted on intake manifold
• Cab has four mounting points.  Two large bolts go in each front floor corner into large cupped washers, through the floor and brace that's riveted to the frame.  Their should be a rubber spacer between the cab and frame mount.  The rear mount is located in each rear corner behind the vertical strength plate welded to the floor.  It consists of swivel supports with 4 bushing per side and bolts with (2) bolts to the floor and (2) bolts to the frame.
• Speedometer: ************
• New Design with short dual arm needle and different face.  All other gauges different then previous years.
• Mph went up to 90 mph.
• High beam indicator located in the center of the housing but now above the speedometer needle.
• Engine was the famous 235 identified by NO center hold down studs on the valve cover
• Brakes:
• separate adjuster no longer on wheel cylinders.
 

GMC MISC. INFORMATION:

 FRAME YEAR IDENTIFICATION :

1947-1948

• Cabs held down with two forward mounting bolts and one rear shackle in middle back of the cab.
• The frame also contains brackets on the passenger side of the frame below the bed for the gas tank
• Lever action shock mounting holes instead of riveted on brackets

1949a

• The cab is now bolted down with (2) front mounting bolts and (2) rear shackle mounts
• Gas tank relocated inside cab behind seat so no longer brackets on frame below bed
• Lever action shock mounting holes instead of riveted on brackets

1950a

• Gas tank relocated inside the cab so their are NO brackets below bed on passenger side for tank
• Shock converted to modern style.  Shock absorber mounting brackets are riveted to the frame

1951a

• No Change from previous year

1952a

• No Change from previous year

1953a

• Their was an indentation "design" near the spring hangers which is probably a strength improvement?

1954a

• The rear frame kick up was reduced to lower box height on the frame
• Rear cross member is different or the mounts are different for the bell housing