VIN code KNP

[1998ECSB4x4]

So been browsing the forum for awhile now, saw the vin decoder. Put in the VIN and came up with this: KNP: COOLING SYSTEM,TRANSMISSION,HEAVY DUTY HVY DUTY TRANS CLG SYS(KNP). Now it's got the basic 350 vortec with 4L60E and 3.42 gears. What I'm wondering is was that just the standard option or dose my truck have a better trans cooler than stock?

 

[sewlow]

Sounds like a towing package option.