Synchrotech 1st/2nd Gear Synchronizer Sleeve – Honda B-Series Manual Transmission (SO-137)
The Synchrotech 1st/2nd Gear Synchronizer Sleeve (SO-137) is a transmission component for Honda B-Series Manual Transmission. Designed for repairing or rebuilding compatible Honda and Acura manual gearboxes, it helps address worn transmission components during a properly inspected rebuild. This listing focuses on correct part identification and transmission compatibility rather than engine code alone.
Key Features & Application
- Manufacturer: Synchrotech Transmissions
- Part number: SO-137
- Transmission family: B-Series
- Service area: 1st and 2nd gear
- Purpose: Replacement component for a compatible manual transmission rebuild or repair
This sleeve engages the 1st/2nd gear synchronizer assembly and should be matched to the existing hub and gear engagement teeth.
Transmission Fitment
1989–2001 B-series applications; listed gearbox codes Y80, S80, YS1, Y21, S21, S4C, Y1, S1, A1, J1 and Y2.
Fitment warning: Confirm transmission code and sleeve dimensions before purchase. Earlier and later B-series gearbox assemblies can differ.
Product Specifications
| Brand | Synchrotech |
|---|---|
| Part number | SO-137 |
| Product type | 1st/2nd Gear Synchronizer Sleeve |
| Transmission family | B-Series |
| Gear coverage / application | 1st and 2nd gear |
What's Included
One 1st/2nd gear sleeve.
Installation Notes
Transmission disassembly and inspection are required. Check mating gears, hubs, sleeves, bearings and synchronizer components as applicable; replacing one worn part will not correct damage elsewhere in the assembly. Professional installation is recommended, and exact fitment should be confirmed before purchase.
