Compression Ignition Addict
Join Date: Dec 2007
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info, 38 mph vibe rear diff?? vibration
Another chapter to this 38 mph vibration. I need some info. I found a bad uvch harness and fixed it. The motor really seems to be running good.
I jacked the rear of the truck up tonite and ran it to 38mph. It starts to vibrate as it oes when i am driving it. YOu can see the rear end start to move up and down. I tried 2 different sets of back wheels to eliminate a bent rim.
Weird thing is that barely giving it more gas to go to 39 mph it seems as if it unsticks or something and jumps to 43 mph. Like i am letting go of the brake.
The brakes are not hanging up.
It weird how it raises speed more than what i am pressing the pedal to do. It jumps up 5mph.
If the reardiff starts to shake the whole back of the truck, its not just with the same wheels, does that mean the issue is in the diff?
2008 6.4 f250 lariat 4wd