VIN Code, 4th Position-Restraint System For Trucks Only
Brake System GVWR Class GVWR Range Truck's w/o Air Bags Lt. Trucks & MPV's w/
 Second Gen. Air Bags
Lt. Truck's & MPV's w/
 Sec. Gen. Air Bags & Side Air Bags
RHD U.S. Postal Service Explorer
w/o
air bags
Hydraulic Class A: Not greater than 3,000 pounds   T    
Hydraulic Class B: 3,001-4,000 pounds    U 1 B 2  
Hydraulic Class C: 4,001-5,000 pounds    Y C  
Hydraulic Class D: 5,001-6,000 pounds   Z D M
Hydraulic Class E: 6,001-7,000 pounds   R E G
Hydraulic Class F: 7,001-8,000 pounds    P F  
Hydraulic Class G: 8,001-8,500 pounds    V    
Hydraulic Class G: 8,501-9,000 pounds H N    
Hydraulic Class H: 9,001-10,000 pounds J S    
Hydraulic Class 3: 10,001-14,000 pounds K W    
Hydraulic Class 4: 14,001-16,000 pounds L X    
Hydraulic Class 5: 16,001-19,500 pounds M A    
Hydraulic Class 6: 19,501-26,000 pounds N      
Hydraulic Class 7: 26,001-33,000 pounds P      
Air Class 3: 10,001-14,000 pounds T      
Air Class 4: 14,001-16,000 pounds U      
Air Class 5: 16,001-19,500 pounds V      
Air Class 6: 19,501-26,000 pounds W      
Air Class 7: 26,001-33,000 pounds X      
1 For Ford Escape and Mazda Tribute Code "U" is equivalent to Code "Y" indicating Hydraulic Brakes, 4001-5000 lb.
GVWR, and Second Generation Air Bags
2 For Ford Escape and Mazda Tribute Code "B"  is equivalent to Code "C" indicating Hydraulic Brakes,
.4001-5000 lb GVWR, and Second Generation Air Bags