Vintage Mustang Concours Technical Questions Answered
I have a question on Boss 351 lower control arms. Did originals have the jack tabs on them like the ’69-’70 lower control arms? The ones on my car have a dimple in the arm rather than the jack tab. Did this change for 1971 or did a previous owner replace my originals? Thanks.
Columbia, South Carolina
The 1971 Mustang used the D10Z-3078-A lower control arm. The D10Z-3078-A did not use the spot weld–attached jack tabs like ’65-’70 Mustang lower control arms. The 1971 arms had a dimple stamped in the arm to eliminate the jack tabs. Picture of a 1971 assembly line lower control arm is provided here for reference.
Valve Stem Extensions
I have a 1973 convertible with the sport wheel cover option. Ford used a valve stem extension to aid tire inflation with the wheel cover installed. Would you happen to know the length or Ford part number? Thanks!
Big Dave (last name withheld)
Buffalo, New York
The Ford service part number for the valve stem extensions is C6AZ-1705-A. The length is ¾ inch. The number on the package in the picture is the engineering part number, which differs from the Ford service part number. Ford dealers and most obsolete parts suppliers use the Ford Service part number for reference.
Would you be willing to take a close-up picture of the underside of the hood on your unrestored beige ’67 convertible for me? The correct installation of the wiring and clips has me confused on my car. I’m sure others would also use it for reference. Thanks.
Des Moines, Iowa
I have included three pictures of the ’67 hood underside for reference of the wiring clips and routing for you. I hope this answers your questions.
Photography by Bob Perkins