25113932
Shift Fork
Mack

The shift fork is a key transaxle or transmission component that moves the gear collars to engage different gear sets. Its precise geometry controls shift quality, preventing gear clash and extending the life of synchromesh components. The fork must withstand cyclic loading, torsion, and thermal expansion without deforming, so it is typically manufactured from high-strength steel and heat-treated for durability. Correct installation ensures synchro engagement at the intended gear, smooth shifting, and consistent torque transmission during accelerations and decelerations. Wear on the fork’s contact surfaces can lead to sloppy shifts, gear wear, or downtime. Therefore, replacement requires careful attention to alignment, mounting bolts, and compatibility with the specific transmission model. When selecting a replacement, verify bore size, fork thickness, and linkage geometry to guarantee reliable operation over the expected service life. Source One Parts Center.