U 153 Type GVW

[Dark Knight]

I am looking at a Bronco that has a U153 on the vin tag inside the glovebox does anybody know what this is? I looked on Broncohio to break the vin down and the highest listing they have is a U152. The U153 is under the Type/GVW

 

[broncodriver99]

U153 is the 4450 GVW package(Medium Duty) with a rear bench seat.