18-Speed Heavy Truck Constant-Mesh Gearset Transmission

Why Source Transmission From Orion Services

OS-TRN-8821 is verified against our internal fitment and stress-test protocol before it's cleared into the transmission index, so what you see is what actually ships — not a generic listing pulled from a third-party feed. Every unit is inspected for tolerance, finish, and dimensional accuracy against the compatibility record listed above, whether it's headed to a long-haul fleet depot or a working farm.

This SKU is temporarily out of stock, but requesting a quote gets you a real lead-time estimate from our team within 24 hours — not an indefinite backorder with no visibility. Our technicians — Curt, Eric, and Abhi — personally review every quote request to confirm the part matches your equipment before dispatch, cutting down on costly return shipments and downtime.

Can't find the exact fitment you need, or need a modified version of this part? Our custom fabrication team can reverse-engineer this component to match a discontinued model, a non-standard bolt pattern, or a one-off fleet modification, with CNC machining and pressure testing before it ships.