75 Coil Spring Label

[Alger R.]

The original Coils Springs on my 75 still had the green labels on them. The code was "AJ" and the number was 346940. I believe them to be the originals but have no absolute proof. The NCRS Judging Guide shows the AJ code as N/A for 75?? Can anyone verify that the AJ-346940 label was used in 75. See pics of original coil spring label

[Tom R.]

Re: 75 Coil Spring Label

The original Coils Springs on my 75 still had the green labels on them. The code was "AJ" and the number was 346940. I believe them to be the originals but have no absolute proof. The NCRS Judging Guide shows the AJ code as N/A for 75?? Can anyone verify that the AJ-346940 label was used in 75. See pics of original coil spring label

Alger

Very nice. My data shows the AJ used in 76 for Corvettes with spring weight of 761-800 pounds, same as NCRS Tech guide.

I show 75 using only two springs: an AH and an AY...and so does the 75-77 tech reference guide.

What's peculiar is that the 76 part numbers, such as the 346940 fall in line with the 75 sequence...346939 and 346943.

this is where I go to my build sheet inventory but I have only a few for 75-76 and what I do have for 75 conflicts with the NCRS tech guide. go figure.

Here are my theories:

So what's the build date of your 75? A late 75 which may suggest it was subject to 76 broadcast codes.

75-77 tech manual is not current in this respect and in need of further research. I say this because my build sheets show both a AA for front coild springs and an HY...does not reconcile with published documents. I trust the build sheet.

[Alger R.]

Re: 75 Coil Spring Label

My 75 Build date was April 2nd 1975. (VIN 1Z67J5S421273) It is a convertible L48 4 spd with air.
I would hope that the AJ Coded Coil Spring was indeed introduced prior to that date.

AL