My suggestion, RayTech, is to read pg 7-47 of the current Model 7400 maintenance manual, left column, paragraph 4 that states, "If the reading exceeds 0.090in. (2.3mm), then the radial rings should be replaced." The standard is 90 thousandths, not 120. Also, there is a service bulletin that requires the shortening of the steer sensor rail that the prox switch reads. Yes, if the ring gear on the top of the drive unit is loose, the code can appear from this as well. Just wanted to clarify...