Just checking out different items at Autozone and Advanceautoparts online I went ahead a registered with my name and vehicle info. At one of the sites it asks if your truck vin is either V8 5.4 Liter FI 330 CID VIN 5 or V8 5.4 Liter FI 330 CID VIN V. What is the difference in the VIN 5 and the VIN V. I am thinking maybe it has something to do with one being flex fuel vehicle.

 

Yup, that's it. 5 is straight gasoline, V is flex fuel.

 

That was quick. I just love this site.
Thanks.