How to find difficult vibrations

Not long ago we had a 2008 Suburban 4x4 come into the garage with a vibration when turning right. After looking at the suspension, tires, bearings, and brakes, we came to the conclusion that only when turning right at a moderate speed the anti-lock system would engage causing the vibration under the floorboard. Further studying could not find any reason for it to be engaged. Speed sensors were ok as well as all mechanical parts.

We came to the conclusion that the computer was receiving bad information. After further investigating we concluded that the owner had put on larger than OEM tires causing the readings from the speed sensors to show on turns that one tire was spinning too fast so the computer was activating the anti-lock. After we reprogrammed the new tire size into the computer, all was well.

Vibration problem solved