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Power Strokes
6.4 Tech
Driveline vibrations
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[QUOTE="kleake, post: 1405733, member: 25987"] 2008 F250, crew cab, 6.4, short bed, 4x4, stock height. Daily driving is fine, but when towing I get major driveline vibrations through 1st gear, reduced in 2nd but still there, by 3rd all is smooth. It's always had it but seems to be getting worse. I'm towing a 36ft 5th wheel so i've got at least 2-3k lbs on the rear axle. I removed the 1" spacer above the carrier bearing and it helped, but didn't eliminate it. I have also added shims on the rear axle to tilt the pinion lower in hopes that when under high torque it doesn't rotate as high. I've looked at the driveline angles and they look pretty darn close, but I haven't actually measured them. With no lift, I would have guessed they are pretty close already. I never feel it when i'm not towing, or if I am not on the throttle while towing but it's almost scary if I stop on a hill and have to get going again. I'll usually use 25% throttle through 1st, then maybe 40% through 2nd, then by 3rd I can go all the way if needed. Anyone else have this? I'm almost ready to get traction bars to eliminate axle twist. [/QUOTE]
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