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Go look for some rumble strips on a paved road or look for a Washboard road somewhere.While you're driving keep trying to lean forward. If the belt locks and stops you from doing so,I'm sure you'll have figured out that they work.
Of course you could always do what Ford did in a commercial when the F-150 came out.
That was to drive down a set of railway tracks on the ties with an egg in the cab that didn't move but, the front I-Beam suspension the wheels were just a hammering away.
Dennis
Oh....Please Don't Ask Me Any Tough Questions As:
"I'm Saving Up MY Memory For When I Develop Alzheimer's"
78 F-150 429CJ C6 ,Silver w/Explorer Pkge
641/2 Mustang,Pre-World's Fair Car #8092
64 Fairlane S/C waiting for a 390-4spd.
68-Mustang.Sunlit Gold 80,000 miles
I may be wrong on this, but I think if you hit the brake they should lock up. Sit down, strap in, hit the brake and see if you can lean forward. If you can't then you're good.