The Spicer TTC 313776X is a synchronizer assembly (Non Back Taper) that our parts manual lists in six Spicer transmission models. In the CM4054-A, CM4054-D, ES42-5A and ES42-5D it is the 2nd and 3rd speed synchronizer in the output mainshaft group, item B-9, one per assembly. In the ES52-7B and ESO66-7B it is the 4th and 5th mainshaft synchronizer in the front mainshaft group, item B-19, one per assembly. A synchronizer matches the speed of the gear being selected to the shaft before the gear locks on, so the shift goes in without a clash. A genuine Spicer TTC part from Pro Gear and Transmission.
Features
Synchronizer assembly, Non Back Taper
2nd and 3rd speed synchronizer in CM4054-A, CM4054-D, ES42-5A and ES42-5D (item B-9, one per assembly)
4th and 5th mainshaft synchronizer in ES52-7B and ESO66-7B (item B-19, one per assembly)
Matches gear speed to shaft speed so the gear engages without a clash
Worn rings and sleeves show up as grinding when shifting into that gear
