Quote:

40th week of 08 would read 4008.



I think that is correct, they went to a 4-place date in 2000.

So the tire in question, would (I guess) be 4th week 2008.

The "PRO TRAC" line of tires was a "speed shop" regular for hot-rods in the mid-70s to mid-80s. The were recently re-introduced/reproduced and are available at Coker Tire, JEGS, ebay and others.

Just like you can buy G60-15 Goodyear Polyglas GTs, you can now buy N50-15 PRO TRACs - for mo' better traction!