A-Chassis Assembly

A-Bars + AA-Arms Assembly

AA Double-Bar Assembly

AA Single-Bar Assembly

No front bumper was provided on the initial AA-chassis. This is confirmed by 1927 Ford photographs as well as the first advertising booklets. One booklet titled “New Ford Car” and another booklet for the AA truck (see pages 4—5 of this “The New Ford Model AA Truck” booklet.

The Indianapolis May 25, 1928 service letter states:

Bumpers On Commercial Cars: We are in position to assemble front bumpers on all commercial cars, such as pickups, and trucks, when requested by the dealer. Therefore, under this ruling, dealers should get in touch with the Car Distributor when he has an order for commercial jobs and knows that he is going to be notified to come after such equipment. When installed, these parts are subject to same discount as the car on which the installation is made, in place of 25% when sold thru service.

Consequently, AA-trucks had no front bumpers except:

……1 – Dealer service provided equipment – 12/27—5/28
……2 – Ford optional equipment ordered – 5/28—9/28*
……3 – Ford standard equipment – 9/28*—12/29

*9/28 based on RGJS pages E-34 and E-87 (2016 Revision)

A-chassis front bumper assembly A-17750-B? was used 12/27—12/29. This assembly included the A-chassis bumper bars, end bolts/spacers, end/center clamps, bumper arms and arm-to-frame installation fasteners.

The RGJS Areas 4 and 15 provide details for all of the A-chassis front bumper parts. The RGJS E-4 and E-15 provide usage-date-ranges for A-chassis front bumper assemblies as used on the AA-chassis.

Ford Parts Price Lists show this assembly as A-17750-B. There would have been different assembly designs dependent on the three designs of center clamp and two designs of bumper bar.

Details of this front bumper are shown in the A-Chassis Front Bumper Gallery.

Usage – Front bumper A-17750-B? assembly was provided as listed below. When #1—#2 were not used, then no front bumper was provided.

……1 – Dealer service provided equipment – 12/27—5/28
……2 – Ford optional equipment ordered – 5/28—9/28*
……3 – Ford standard equipment – 9/28*—12/29

*9/28 based on RGJS pages E-34 and E-87 (2016 Revision)

Front Bumper Assembly AA-17750 was used 1/30—10/30. An “A” suffix was added to the part id 5/30. See the AA-17750 Assembly Gallery for details.

This assembly included both A-chassis and AA-chassis parts:

A-chassis parts of this assembly were the bumper bars (two A-17757-C bars 1/30—4/30; two A-17757-D bars 5/30—10/30), end bolts/spacers, end/center clamps, and arm-to-frame installation fasteners. The bumper bars had an approximately 3-3/8″ or 3-1/4″ outward arch over the length of the bumper when installed (depended on bar length – see gallery drawing).

AA-chassis parts of this assembly were bumper arms AA-17754-B RH and AA-17755-B LH.

The AA-arm design placed the bumper end clamp assemblies approximately 39—39-1/2″ apart (center-to-center measurement). This was about 3” closer together than the spacing for the 1928—1929 A-chassis bumper end clamp assemblies.

The outer ends of the bumper arms were angled inward about 6°. This was the contact angle of the arched bumper bars.

Note: The A-chassis 1928—1929 bumper bar assembly will not correctly fit to these AA-arms. The outer bumper clamp spacing would make contact to the mostly flat section of the 1928—1929 bar assembly. Consequently, the bar assembly would be arched outwards with the clamps installed due to the inward 6° angle of the AA-arm outer ends.

6/30—10/30 – The AA double-bar front bumper assembly was released for use on a few trucks during this date range. This was noted in the Ford Parts Price Lists. It would have been used for AA-vehicles with cab/body types 76-B, 82-B, and 85-B.

2/31—5/32 – The AA double-bar bumper was again used with the release of Briggs-Closed-AA’s (270-A, 275-A, 280-A, 285-A, 290-A, and 300-A) as optional equipment. These body types may have had either the single-bar or double-bar bumper.

Refer to the AA Double-Bar Gallery for details.

Note – This bumper assembly was initially assigned with id AA-17750-B. It was re-assigned id AA-17750-B1 when the AA-17750-B2 single-bar AA front bumper was engineered in September 1930. The Ford Part Price Lists only shows individual parts for this assembly until the December 1932 Ford Parts Price List. In this list, both the B1 double-bar and B2 single-bar bumper assemblies are listed.

The AA single-bar front bumper was used from 11/30—12/32 (see exceptions). Single-bar details are shown in the drawings in the AA-17750-B2 Gallery.

The bumper bar, back bar, and arms were a dipped, gloss black enamel finish. The bolts were raven finish with black painted heads. The lock washers and nuts were finished with black paint.

The bumper bar was attached to the arms with A-21280-S4 9/16-12 x 1-1/2″ special head carriage bolts (1-11/64″ diameter x 5/16″ high heads), lock washers and hex nuts.

The bumper bar to back bar (at the center) was attached with A-21169-S4 7/16-14 x 1-1/4″ special head carriage bolt (15/16″ diameter x 3/16″ high head), lock washer and hex nut.

The arms-to-back-bar were attached with two A-21219-S4 1/2-20 x 1-1/4″ hex head bolts, nuts, lock washers.

The attachment of the bumper arms to the frame used the black paint finished A-chassis design 3 studs.

This bumper replaced the AA-17750-A Front Bumper Assembly and the AA Double-Bar Front Bumper Assembly AA-17750-B1 which was being used on some 1930 AA-vehicles.