Whats the difference in the 120, 139, and 157 inch wheelbase? How can I tell what I have?

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The Truck: 1997 Black F-150 Flareside. Regular Cab ORP and Towing Package
The Mods: K&N Filter, Eurolid Hard Tonneau, Profile Windstream Side Deflectors and Lund X-Terminator Bug Deflector.
The Site:
Triton's 4.6 Liter Web Page
www.mindspring.com/~acbradley/index.html
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157" = S/C L/B
139" = S/C S/B

139" = R/C L/B (not 100% sure on this one)
121" = R/C S/B

 

the term wheel base refers to the distance from the center of the front axel to the center of the rear axel. regular cab trucks are avail. in 120" and 139" wheel bases. super cabs were avail. as 139" and 157".
Your '97 Flairside Reg cab (short bed) should have a 120" wheel base.

 

Thanks all!