A technician is performing a four-wheel alignment on a vehicle with a solid rear axle. The alignment machine shows a rear left toe of +0.20 degrees and a rear right toe of -0.20 degrees. The total rear toe specification is 0.00 degrees +/- 0.10 degrees. What is the most appropriate action for the technician?
- AReplace the rear axle assembly, as it is likely bent.
- BAdjust the rear left toe to decrease toe-in and the rear right toe to increase toe-in.
- CPerform a road test to verify the vehicle's handling.
- DAdjust the front toe to compensate for the rear toe split.
Show answer & explanationAnswer & explanation
Correct answer: A. Replace the rear axle assembly, as it is likely bent.
With a solid rear axle, individual rear toe is not adjustable. If there is a significant split in individual rear toe readings (like +0.20 and -0.20), it indicates that the rear axle itself is bent or twisted. The total rear toe is 0.00 degrees (+0.20 + -0.20 = 0.00), which is within specification, but the individual toe readings are severely out of spec, pointing to a bent axle that cannot be adjusted.
Why the other options are wrong
- B. Individual toe on a solid rear axle is non-adjustable, so this action is not possible.
- C. A road test would confirm handling issues, but the alignment readings already indicate a major suspension problem that needs repair before a road test is meaningful for alignment validation.
- D. Adjusting front toe to compensate for a bent rear axle is a temporary workaround that does not fix the underlying problem and can lead to other issues.
Solid Rear Axle Toe Discrepancy
On a vehicle with a solid rear axle, individual toe is generally not adjustable. Significant discrepancies in individual rear toe readings, even if total toe is within spec, indicate a bent or damaged axle assembly.
- Individual rear toe not adjustable on solid axles.
- Split individual toe implies a bent axle.
- Requires repair or replacement of the axle.
Memory trick: Solid axle, toe's a mess; if split, it's bent, no less!