Any ideas why? Its cold here also...20 degrees.
Sound likes its coming from the rear.

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Fast46Triton ®

1999 Ford F150 XLT Supercab, Shortbed, 4x2, 4 wheel disc brakes/4 wheel Anti-Lock Brakes, Cloth Seats, Amazon green, 16" All season tires, Soft Tonneau Cover, CD Player, 4.6 liter Triton V8 with possible piston slap!, 3:55 ls, towing package, 4 speed auto, K&N Airfilter

The only part that you are going to see of my truck is my tailgate so get used to it!

 

Are you sure it's not ATST hanging on for dear life?

 

She would have fallen off by now, ya know, from all the curbs I run over and mailboxes I hit

 

BAck to the top.

 

I think it's your tranny slipping from all the hot rodding you're doing trying to stay in front of ATST!

Seriously, do you have any more details on this problem?

 

Does it do it when you take off hard or all the time and does it happen when your driving along as well it could be almost anything more details needed.

 

Does it vibrate only on takeoff, or the whole time? I am having a similar problem. But mine is mainly the engine I think.

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97 F-150 S/C 4x4 ORP XLT 4.6 K&N , Flowmaster w/dual tailpipes, Bosch+4 plugs,MSD 8.5 wires,Superchip.Patriot fiberglass toneau cover, Westin chrome step bars.
Kenwood 4011 stereo, Rockford 150a1 amp, Profile electronic crossover, and 2 10" JBL's.