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Vibration starts about 45mph -gets better or woese as it feels like it but never goes away. had three drive shafts made and balanced, replaced and balanced 12 new tires, changed pinion angles every way possible also transmission angles . car is 2 wheel drive, automatic with wheelbase shortened to 100 inches
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IS that vibration related to RPM? If so the harmonic balancer and or the crank shaft might be out of balance. If it is not related to RPM, then you need to check to see if the shafts are all installed correctly and the motor mounts are ok. It could also be the tires flat spotted if they sat a long time.
You will need to check things logically. Run the truck in the air and note where the vibration is at. Take the wheels OFF and put a few lug nuts to hold the rotors on, take the truck to 45mph or whatever the vibration is the worst. is it still there? if its gone, check wheels/ tires. if its still there, check rotors, axles. A drive shaft will make a rapid vibration at low speeds since it turns 3 to 4 times faster than the wheels. does it vibrate on or off the gas? Can you power through the vibration like go 60 and then coast back through? You have replaced a lot of parts that would not cause vibrations. Are you just changing parts willy nilly or is someone actually checking and verifying that these parts really bad?
Poor quality tyres aren't round and it is a waste of time trying to balance them. I doubt that is the problem here but it is worth knowing.
Such a vibration could have several causes from brakes to drive shafts (FWD) through shock absorbers. There is no easy answer and only hands-on checking everything thoroughly will reveal the culprit.
It would be worth asking an experienced person to go for a drive and express an opinion.
Rev the engine while out of gear , if vibration check units driven by fan belts. if no vibration and is front wheel drive, check joints on both drive shafts, if rear wheel drive check front and rear tail shaft u / joints, check wheel balance or out of round tyre .
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