C3 Jacks

[jim34671]

What is the insignia or logo stamped on the bottom face of C3 jacks?

[Harmon C.]

Re: C3 Jacks

The letter (A) (Auto Specialties Mfg. Co.) is stamped on the pad that contacts the chassis. Date code is on one of the outer arms 3M ( Dec. 1973).

[jim34671]

C3 Jacks

Thanks.
I got that part,but cannot find reference in by books,judging manuals as to the stamped logo,if any on the bottom base of jack...surface of jack that contacts the ground.
Mine has something there,but cannot make out characters.
(1977)
Thx

[Harmon C.]

Re: C3 Jacks

I found in the 75-77 TIJG that (SMP) was stamped into the base is this what you are seeing? SMP is belived to represent Stant Manf. Products. The date code was on a rivit head 642 would be 42nd week 1976. This started in 1976. I missed the year in my first post if it was their.

[jim34671]

C3 Jacks

That's it!
Thx a lot and Happy Holidays.

[Tom R.]

Re: C3 Jacks

Jim:

I wrote an article in 97 on jack date codes for the 76 through 79 cars...76 through 78 used a similar date coding and logo stamp and differed from what was used before 76. The date code is on the right side rivet head, uses three digits and would look like 743 or, the 43rd production week of 1977.

I found on the bottom of jacks I used in my research the letters in lower case "smp" However, I did not find this on 76 jacks although they confirmed to the same date code format.

I do know that 75 jacks conformed to the 75 judgin manual but 76 is when a change occurred...though I don't know when in the 76 production cycle. I have yet to determine the source of jack production for the 76-78 model years.

[Tom R.]

Re: C3 Jacks

Nice work Lyle...I hadn't finished reading "ALL" messages before responding but Lyle got it right and added the manf source!

[Tom R.]

Re: C3 Jacks

This thread picqued my curiosity and provided an opportunity for me to use my new Corvette Restorer CD-Rom encylopedia, searching on "jacks." What I learned was limited but by supplmenting this with a browse through the judging manuals I learned that knowledge of jacks, their manufacturers and date codes is rather complete with the exception of the manufacturer for what I call later model C3s...1979-82!

I'm gonna repost this under new topic...but do you know who manufacturered the late model jacks?