ok i had this question posted earlier and since i have had a few more ??'s. it has nothing to do with the drive train, the trans, or anything like that.
the motor has a double pulley on the crank, why?
the truck has no options, why would they put a double pulley on it? is it possible someone put the wrong one on? and if i take this one off and problem goes away how do i find the right pulley?
ok all thanks

 

Hey dude How about not starting another same name thread. Your other one is still active. Guys here can't see or hear your truck run. We can give you tips, but you will have to fix it or have it fixed yourself.

John
jowilker

66 F100s
In the still cool hours of the night, you can hear chevys rusting away.

 

Pulleys are only stamped steel and do break. So maybe someone had to replace it. Or maybe when the truck was being built, Ford ran out of single belt models so slapped on a double one to keep the line moving. Unless you see the pulley wobbling on the balancer, your vibration isn't there; pulleys don't have enough mass to cause a problem. Change the motor and transmission mounts and then look at the balancer; all four of these could be bad since all use rubber and could be over 30 years old.

Lee
1965 F100 short box styleside