Possible Fix for Slight Vibration above 50 mph
#1
Possible Fix for Slight Vibration above 50 mph
I have had a minor vibration above 50 or so mph(by speedometer).
Installed a new driveshaft and corrected the pinion angle to near perfect. It seemed to help a little.
I have OEM 4.30 gears and 33.4" tall tires.
I had to retune motor/PCM and one of the options while installing the new tune was tire revs per mile. I input 620 and pressed on.
Now my slight vibration is gone. Even at a corrected 70 mph it's smooth.
I'm a little baffled, as I do not understand how a tire diameter correction in the PCM could affect the drivetrain?
Any suggestions?
Installed a new driveshaft and corrected the pinion angle to near perfect. It seemed to help a little.
I have OEM 4.30 gears and 33.4" tall tires.
I had to retune motor/PCM and one of the options while installing the new tune was tire revs per mile. I input 620 and pressed on.
Now my slight vibration is gone. Even at a corrected 70 mph it's smooth.
I'm a little baffled, as I do not understand how a tire diameter correction in the PCM could affect the drivetrain?
Any suggestions?
#3
I had a similar issue with a Sub I owned for years. When I replaced the U Joints, I checked the rear yoke. I gave it a good solid tug. And moved it side to side. It had vibrated a little bit loose.
Torqued it back to spec and the vibration disappeared. So if this comes back, check your rear yoke to make sure it's not loose, even a little bit. I can not say whether the U joint wearing out caused the yoke to loosen or vice versa. But there is another possible cause for vibrations in the drive line.
Torqued it back to spec and the vibration disappeared. So if this comes back, check your rear yoke to make sure it's not loose, even a little bit. I can not say whether the U joint wearing out caused the yoke to loosen or vice versa. But there is another possible cause for vibrations in the drive line.
#4
I have had a minor vibration above 50 or so mph(by speedometer).
Installed a new driveshaft and corrected the pinion angle to near perfect. It seemed to help a little.
I have OEM 4.30 gears and 33.4" tall tires.
I had to retune motor/PCM and one of the options while installing the new tune was tire revs per mile. I input 620 and pressed on.
Now my slight vibration is gone. Even at a corrected 70 mph it's smooth.
I'm a little baffled, as I do not understand how a tire diameter correction in the PCM could affect the drivetrain?
Any suggestions?
Installed a new driveshaft and corrected the pinion angle to near perfect. It seemed to help a little.
I have OEM 4.30 gears and 33.4" tall tires.
I had to retune motor/PCM and one of the options while installing the new tune was tire revs per mile. I input 620 and pressed on.
Now my slight vibration is gone. Even at a corrected 70 mph it's smooth.
I'm a little baffled, as I do not understand how a tire diameter correction in the PCM could affect the drivetrain?
Any suggestions?
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