RING SYNCRONIZER BLOCKING T84
Brass synchroniser ring T84 gearbox
Brass blocking ring for 2nd and 3rd gear - Willys MB / Ford GPW
High-quality brass synchroniser ring (blocking ring) for the Warner T84J gearbox of the Willys MB and Ford GPW. This ring forms part of the synchronisation mechanism ensuring smooth shifting between 2nd and 3rd gear. Manufactured to original specifications. 2 pieces required per vehicle.
Original number WO-637834 | Application T84 / T84J transmission synchronizer |
Material Brass with 24 teeth | Suitable for Willys MB '41-'45, Ford GPW '41-'45, Ford GPA |
Features
- Brass blocking ring for T84 synchronizer assembly (WO-A-6318) Required: 2 pieces per vehicle (one per blocking ring position) Synchronises 2nd and 3rd gear only — 1st gear is not synchronised 24 teeth on tapered inner face for grip on gear cone Replaces worn rings when shifting is difficult or gearbox crunches
★ The Warner T84 gearbox is a 3-speed gearbox with synchronised 2nd and 3rd gear. The brass blocking rings form the heart of this synchronisation mechanism: they press against the conical surfaces of the gears to bring them to speed before the gear engages. Worn blocking rings with rounded teeth or grooves must be replaced for correct operation.
📖 From the Technical Manual
Mounting
- 1. Place blocking ring on tapered side of 2nd gear (tapered end facing forward) 2. Slide synchronizer assembly onto mainshaft with long side of hub facing forward 3. Place second blocking ring in synchronizer before fitting main drive gear 4. Test: new ring must not sit fully against gear and must offer resistance when turned 5. Worn ring turns freely and sits fully — replace
Specifications
- Warner Model T84J, 3-speed Synchronous Mesh Ratios: Low 2.665:1, Second 1.564:1, High 1:1 Synchronisation: 2nd and 3rd gear only Blocking ring: 24 teeth, brass construction
This part is intended for the restoration of historic military vehicles. Fitting, aligning, deburring or reworking is part of that work and is inherent to the nature of these goods. Dimensional variation also exists between original vehicles.
Installation requires technical knowledge of the vehicle. Unsure whether this part suits your version? Ask us before purchase at info@willys.be.
This part fits:
| Model | Years |
|---|---|
| Military jeeps | |
| Willys MB (early) | 1941, 1942 |
| Willys MB | 1942, 1943, 1944, 1945 |
| Hotchkiss M201 | 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966 |
📐 Diagrams & technical drawings
From the original Technical Manual TM 9-1803B — Ordnance Maintenance — Power Train, Body & Frame — only for Willys MB / Ford GPW (¼-ton 4×4)
