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Frame on F 150 is just failing
I purchased a Ford F 150 - 4wd - std transmission - manual hubs, new, in 1995. I ordered the 4.9 ( 300 cu in ) in line 6 cylinder engine. I was well aware of the engines track record; and the availability of the 4.9 liter in line 6 was the very reason I made the purchase. A brutally powerful engine - reasonable gas mileage - incredibly dependable ( does not know the meaning of the word "quit" ). One major tune up in 15 years, Every previous diagnostic showed all codes in order. ( PLATINUM PLUGS ). Problem is, now, at just over 100,000 miles ( little more than a break in period for that engine ) , the frame & undercarriage is failing. What good is owning a truck with a drive train that can hit up to 500,000 miles when it's sitting on a frame that is ready to break in half at 100,000 miles. I can only make an educated guess, that Ford contracted different rolling mills to manufacture the F 150 frames, and some used different alloys that were more inclined to rust & decay. I have seen ( in my area of PA ) F 150s ( identical design ) 8 & 10 years older than mine with frames still in very good condition. I have been in contact with Ford, and hopefully, the problem will be resolved. Footnote: Why the 4.9 engine was discontinued is beyond me - all I can come up with is, they don't wear out - and if they don't wear our - the truck will not be traded in. Just me. Jim