Compression Ignition Addict
Join Date: May 2010
Location: Swampscott, MA
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Your rattle is more than likely the Torque Converter.
I have a '99 also, 02/99 build date, and the Torque Converter rattles like a son of a *****.
If I touch the throttle at all, the noise goes away.
Now, as far as getting rid of the noise, it's not worth it to.
You're better off driving the truck until the transmission needs to be replaced, and then taking care of the noise at that time. Unfortunate, I know. I have this same problem. The fact of the matter is, that I don't have extra cash to replace the TC now, and then do it again when the transmission dies.
99.5 F250 ECSB
4" ProComp Lift
ProComp Wheels with 35" Terra Grapplers
TGC Dual Steering Stabilizer
PHP Phoenix 80dd - 120race