Heavy Duty Trailering

[pawpaw]

All,

 

Can anyone tell me what is included in RPO KNP, Heavy Duty

Transmission cooling system.  I also have Z82, Heavy Duty

Trailering Package.  This is on my '01 YXL K1500.

 

As best I can tell, the '00 and up HD Trans Cooling system does NOT include the air/oil heat exchanger behind the front grille. -- What does it have?  How is it more 'heavy

duty' than a standard radiator based heat exchanger?

 

Thanks for the help.

 

Barry B