Original GM Trans-AM Second Gen GM Coil Springs?

[mikebaronehouston]

I have a set of springs which supposedly came from the Hall Chaparral collection.

Part number is X779B440.  I was told this was an experimental GM number. Presumably they are 440#.  I had them tested at an oil-field spring facility--426# and 430# respectively on a very cool compression machine.  Crazy cage around it; I suspect they do so big springs...

Dimensions are .711 wire, 9 coils and 16” free.   I am not sure of the compressed height between the spring pocket and lower A-arm; I'll measure today.

Anyone have a way to decipher and confirm/deny the part number?

Thanks,

Mike

[Jon Mello]

That does not look like a GM part number unless the B is really an 8 however I got no results when I did a search for 7798440.

[crossboss]

Mike,
Most likely the springs were made by an out sorced vendor.

[mikebaronehouston]

Many thanks.

Now I can cut-to-fit without reservation!

[crossboss]

Mike,
Sorry we did not meet up in Houston and check out our cars. IF you plan to travel to Vegas, send me an email.
-Scott.