Synchrotech (89-01) Honda B Series 1st-2nd Gear Transmission Sleeve SO-137
Synchrotech SO-137 delivers reliable 1st/2nd gear synchronization for B-Series Honda transmissions (1989–2001). Built from hardened steel, this replacement sleeve resists wear under performance driving and integrates seamlessly with stock or upgraded components—no modifications needed.
Engineered to exact OEM specifications for Y80, S80, YS1, Y21, S21, and S4C cases, it's an affordable way to restore smooth shifting and transmission integrity without replacing entire synchro assemblies.
**Key Features:**
Hardened steel construction for enhanced durability and wear resistance Precise OEM-spec machining ensures perfect fit and compatibility Compatible with 1989–2001 B-Series gearboxes Cost-effective alternative to full synchro assembly replacement
Applications: ( 1st and 2th sleeve )
- 1st/2nd GSR ITR LS Civic Si
- 1992-2001 (Y80 S80 YS1 Y21 S21 S4C)
- 1989-1991 (Y1 S1 A1 J1 Y2 )
Part Number: SO-137
