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Old 06-12-2019, 07:53 PM   #7
Keith Seymore
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Join Date: May 2009
Location: Motor City
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Re: SPID is missing, 1973 GMC

Quote:
Originally Posted by aggie91 View Post
was the 627,584th one made for that year model.
Actually.....it's not.

Although the sequential portion of the VIN is assigned sequentially it doesn't really mean anything.

If the VIN sequence for GMC started at 500001 in '73, then it would be around the 227,500 ish GMC built in Flint with about 9 times as many Chevrolets scattered in front of it.

If the VIN sequence for GMC started at 100001, just like the Chevys, then it would be around the 627,500th....

...except - each plant has their own VIN sequence counting up, irrespective of the other plants (Flint has TWO, since Line 1 built pickups and Line 2 built Blazer/Suburban), and there were seven final assembly locations for squarebody trucks...

Plus - the plants don't necessarily build in VIN order. Most plants - Flint in particular - have the ability to shuffle builds after the body shop and before paint, and then again after paint and before entering the trim/final line area. That allows for work load leveling downstream (ie, can't have too many manual trans trucks in a row, can't have too many 4wd in a row, can't have too many A/C trucks in a row, etc) as well as for an accumulator (or "bank") to draw from to keep the final line running in the event of a breakdown or work stoppage in body or paint.

So - no.

K
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