The Dana Spicer 4209121 synchronizer is a genuine Dana Spicer transmission part sold by Pro Gear and Transmission.
A synchronizer acts like a small clutch: friction brings a gear and its shaft up to the same speed so the sleeve can lock on without clashing. When one wears, the usual signs are grinding or crunching on a shift, trouble getting into gear, or a gear that pops back out. Match the number against your old part or the parts book, or call us to confirm proper fit.
Features
Genuine Dana Spicer synchronizer
Part number 4209121
Matches gear and shaft speed during a shift
Worn units show up as grinding on shifts, hard engagement or popping out of gear
Call us to confirm proper fit
