72 f100 vibration
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Joined: Mar 2013
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72 f100 vibration
Ok so I bought this truck on a whim. Guy said it needed a harmonic balancer( I replaced) still the vibration. Well figured it was the file plate (c4 tranny) it was fine right weight. Torque converter was good. Maybe it was the timing but no that was spot on to chiltons manual for this 302. Spark plug wires are right compression is strong vacuum lines are all good except the vacuum tree has a few plugged holes. I called the previous owner and he said he rebuilt it 6 months before I bought it and he had put a bigger crank and heavier rods but stock size pistons valves ect. Could this be the problem I'm boggled please help.
Senior User
Joined: Jul 2006
Posts: 409
Likes: 1
Ok so I bought this truck on a whim. Guy said it needed a harmonic balancer( I replaced) still the vibration. Well figured it was the file plate (c4 tranny) it was fine right weight. Torque converter was good. Maybe it was the timing but no that was spot on to chiltons manual for this 302. Spark plug wires are right compression is strong vacuum lines are all good except the vacuum tree has a few plugged holes. I called the previous owner and he said he rebuilt it 6 months before I bought it and he had put a bigger crank and heavier rods but stock size pistons valves ect. Could this be the problem I'm boggled please help.
Cargo Master
Joined: Apr 2009
Posts: 3,038
Likes: 4
From: South west Idaho
I'm thinking the same as "hd97fxdc" , i believe 81 was the 50 oz. balance. I bought what was supposed to have been a 79 302 and had the same problems you are having , turns out my 79 was an 81 . Changed to 50 oz. flywheel and problem solved .
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