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Posts Tagged ‘bumpers’

1947-1955 Rear Bumper Braces

Thursday, February 11th, 2010

During the Advance Design years the rear bumper braces on the 1/2 ton pickup are the same. Their cross section height is 1.75′ and thickness is .35′. These units are designed with a rolling drop angle to lower the bumper to the proper level below the tailgate and rear cross sill.

The 3/4 ton pickup rear braces accomplish the same purpose as the 1/2 ton but must have different angles due to the change in the two side frame rails width. They are closer together on a 3/4 ton. In addition, these braces are heavier than the 1/2 tons with 1/4″ additional cross section height. Their thickness remains at the .35′ as a 1/2 ton.

The 1/2 and 1 ton advance design panel truck (3/4 panel in these years were not produced) rear braces are slightly different from those on the same size pickup. These are dropped less because of the different level of the rear doors or lower gate.

These panel and suburban braces are very rare today and reproductions are not being made.

rear bumper braces 1

1/2 ton left | 3/4 ton right (above)

rear bumper braces 2

3/4 ton left | 1/2 ton right (above)

Advanced Design Spare Tire Assembly

Thursday, February 11th, 2010

During the early years of the Advance Design trucks there were many complaints by new owners about the rear bumper. They didn’t want it as standard equipment. Farmers and businesses could not get close to a dock with a bumper and they removed them soon after the truck purchase. Dock workers and live stock could step in the open slot created between the dock and truck bed. No doubt sprained and broken legs were, at times, a result.

Thus, in 1951 GM ceased placing a rear bumper on pickups as standard equipment. Before this, the rear bumper had nicely protected the under bed spare tire hanger from minor collisions.

Without a bumper the manufacturer was forced to redesign the spare tire assembly. It became suspended from the frame of the truck at an angle. The truck could now receive at least a parking lot collision without damage to the spare tire assembly even without a bumper.

An item of interest: The ½ inch hole in the middle of the rear cross sill that holds the spare tire hook on the 1950 and older pickups was no longer used beginning in 1951. However, the manufacturer continued to place this small hole in the sill through the 1953 year! (In this 1951-1955 photo the eyebolt in this hole is an owner installed add on.)

The two cross chains in this photo are securing the truck to the trailer and are not part of the spare tire assembly.

advance design spare tire 1

1951-1955 (above)

advance design spare tire 2

1947-1950 (above)

Advanced Design Bumper

Thursday, February 11th, 2010

During the 1947-1955 years, pickup’s front and rear bumpers are different due to the shape of the body. Unfortunately, the front can be fit on the rear during restorations.

More of this occurs on trucks between 1951 to 1955 when rear bumpers became a factory option. Years later when the rear bumper is wanted, some people locate a more plentiful front and place it on the rear – and it fits.

Once the front is placed on the rear, it is so rounded that it hits the license plate position. Now the license get relocated so it can be seen. (One problem leads to another.)

advance design bumper 1

Correct Rear Bumper (above)

advance design bumper 2

Correct Rear Bumper (above)

advance design bumper 3

Rounded Front (above)

1954 Rear Bumper

Thursday, February 11th, 2010

In 1954, GM introduced their new deeper improved stepbed. With this design the optional rear bumper required the license to be moved to the center. This eliminated clearance problems between the bumper and the left side mounted license plate.

To save the creation of a totally new rear bumper, GM placed a dip in their pre-existing 1947-1953 unit. This was necessary to allow for complete viewing of the license in its new position.

The following picture shows the correct bumper with a good view of the license plate. The other pictures are of the earlier bumper on a 1954. Only a portion of the license is visible.

1954 bumper 1

Earlier incorrect bumper on a 1954 (above)

1954 bumper 2

Earlier incorrect bumper on a 1954 (above)

1954 earlier bumper 3

Correct 1954 Bumper (above)