Update: 5.29 gears+4" lift=vibrations due to gears?

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This is a tough one since it seems gear related only. Any tire changes at the same time by any chance? Out of balance tires? Put in a double carden lengthened front shaft?

The vibration thing will drive you nuts. I had one truck that I lifted and got severe harmonic vibration. I matched the output / pinion angles, had the drive shafts balanced. Added double cardens with lengthened shafts and still had the vibration. Finally had the tires shaved and it went away.

On another truck with vibration I never could get rid of it and took it all the way back to stock. Sold it. Bought an identical FJ60 - put the lift, tires, etc. on it and everything worked perfect????? Go figure.
 
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