Author Topic: Original GM Trans-AM Second Gen GM Coil Springs?  (Read 2866 times)

mikebaronehouston

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Original GM Trans-AM Second Gen GM Coil Springs?
« on: April 04, 2020, 12:58:32 PM »
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
Mike Barone
Houston, TX

Jon Mello

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Re: Original GM Trans-AM Second Gen GM Coil Springs?
« Reply #1 on: April 05, 2020, 12:46:21 AM »
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.
Jon Mello
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crossboss

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Re: Original GM Trans-AM Second Gen GM Coil Springs?
« Reply #2 on: April 05, 2020, 03:51:38 PM »
Mike,
Most likely the springs were made by an out sorced vendor.
Just another T/A fanatic. Current lifelong projects:
1968 Olds 442 W-30
1969 Mustang Fastback w a Can-Am 494 (Boss 429)

mikebaronehouston

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Re: Original GM Trans-AM Second Gen GM Coil Springs?
« Reply #3 on: April 06, 2020, 05:32:28 AM »
Many thanks.

Now I can cut-to-fit without reservation!
Mike Barone
Houston, TX

crossboss

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Re: Original GM Trans-AM Second Gen GM Coil Springs?
« Reply #4 on: April 08, 2020, 05:18:37 AM »
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.
Just another T/A fanatic. Current lifelong projects:
1968 Olds 442 W-30
1969 Mustang Fastback w a Can-Am 494 (Boss 429)