I have had vibration problems in both my Tundras. On this last one I thought it was the driveshaft, I could actually see the wobble in it when I spun it by hand. The Toyota dealer took it off and sent it out to a driveshaft shop, they seemed to have straightened a bit and balanced it. There was marginal improvement. The biggest single vibration problem I have had are tires. Even with Michelins I've found it took the shop two or three tries with a Hunter Road Force Balancer to get it right. My truck is getting a little better with age, don't know why. On your 2wd I noticed the driveshaft is different. You have no slip spline at the rear like the 4x4. Looks to me like a sticker is comming off the driveshaft. The balance weights are rectangular and metal. I plan to have a good driveshaft shop make me a one piece shaft as soon as my warantee is up. This will eliminate alignment issues with the center carrier bearing (do a seach on this if you are not familiar with that issue). The vib could be from a lot of things, bad brake drum, out of tolerance rear axel, driveshaft, tires, alignment, bad wheel. I doubt it is from the springs though. It's a frustrating problem, a lot of dealers are useless at solving it. If my next truck is a Nissan, my vibrations will be the reason why.
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