Could really use some help on this...
My father had a stroke last year and can no longer drive, so he gave me his 91 F150. It's got a little rust underneath, but is otherwise almost like new. When I got it late last year, it only had 28,000 miles on the odometer. He bought it with the towing package, I'm not sure what that's made up of but maybe stronger leaf springs. It's both a super cab and a long bed, so it has a long wheelbase.
The problem though, is that it's a extremely bouncy ride on the freeways here in Los Angeles. So much so that it's unbearable. It seems that the freeways here are made up of small sections of concrete, and the sections are either warped or they're made that way. The truck is bounces the most at 60-70mph, but much less at 50 or 85mph. I'm thinking the problem is either due to the truck frame flexing (since the frame is so long) or the shocks are insufficient for the springs. I replaced the shocks yesterday, it didn't help at all.
I noticed it doesn't seem to be a problem when the truck is loaded with a few hundred pounds. Is this just an inherent problem with a long pickup or does it sound like a spring/shock tuning problem? What about the frame flexing?
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