Two technicians are discussing a transmission that is noisy in first, second, third, and reverse but quiet in fourth gear. Technician A says there is probably a bad input shaft gear. Technician B says it probably has a faulty 1-2 synchronizer assembly because reverse is on the synchronizer sleeve. Which technician is correct?

Question

Quizplus · Accepted Answer

The input shaft gear is involved in all gears except fourth in many transmissions, which is often a direct drive gear, explaining why the noise would not be present in fourth gear. The 1-2 synchronizer assembly would not affect all the gears mentioned, including reverse.

Two Technicians Are Discussing a Transmission That Is Noisy in First