Eaton Fuller Transmission Synchronizer Kit

The K-3492 synchronizer kit is for Eaton Fuller transmission rebuilding applications. K-2446 is an earlier kit reference in the corresponding parts documentation.

Identify the gearbox model and specify the synchronizer kit required for the repair. Match the actual kit components to the high- and low-range assembly being serviced.

Send the gearbox code, part number or component markings, dimensions and quantity. Include the gear position and photographs of the mating components where available.

Contact TOSEN for a quotation or browse Transmission Parts.

A synchronizer kit for an Eaton Fuller gearbox collects the synchronizer parts needed to restore clean gear engagement at a serviced position, ordered together instead of piece by piece. During synchronization, those parts bring the rotating members to a common speed before the teeth engage, which is what prevents clashing at the lever. Eaton Fuller transmissions divide their ratios between a high-range section and a low-range section, so the assembly being serviced decides which kit the order must reference. The kit forms one part of a gearbox rebuilding project, and the remaining gearbox components stay in place unless the inspection calls for them.

• Component scope: synchronizer kit for engagement restoration
• Application: Eaton Fuller transmissions, high-range and low-range sections
• Service context: gearbox rebuilding projects
• Supply condition: new

Kit selection starts with the gearbox model recorded from the truck, followed by the range section and the gear position under repair. The synchronizer parts at one position differ from those at another, and a kit listed against the wrong range serves no purpose in the rebuild. Component markings found during the teardown, dimensions taken from the removed parts and photographs of the mating components give the enquiry enough evidence for an exact match. Sending the gearbox code together with those records keeps the quotation tied to the assembly actually on the bench.

• Primary check: gearbox model and range section being serviced
• Position check: gear position under repair
• Evidence: component markings and dimensions from the removed parts
• Support: photographs of the mating components

TOSEN checks every synchronizer kit enquiry against the gearbox model and the range section recorded by the buyer. The component markings and dimensions supplied from the teardown are compared with the kit referenced in the order, and the gear position is confirmed before the quotation is issued. Quantities and the delivery destination are recorded in the same step, so the kit that ships is the kit the rebuild actually needs.

What does a synchronizer kit do in an Eaton Fuller rebuild?

The kit gathers the synchronizer parts for the position being serviced, restoring the speed-matching work that allows the gears to engage without clashing. Rebuilding a gearbox involves inspecting every assembly, and the synchronizer positions with worn parts receive a kit rather than a gearbox replacement. The high-range and low-range sections of the Eaton Fuller layout are handled separately, which is why the assembly under repair is named in the order.

Which gearbox details are needed to select the kit?

Selection rests on the gearbox model first, then on the range section and the gear position being repaired. Component markings read from the removed synchronizer parts confirm that the kit covers the correct assembly, and dimensions measured during the teardown support the comparison. Photographs of the mating components complete the record, giving the quotation a documented basis instead of a guess based on the truck model alone.

When should synchronizer parts be replaced during rebuilding?

Replacement belongs at the point where the teardown shows worn synchronizer parts at a gear position, for example engagement surfaces that no longer produce clean shifts. A gearbox opened for rebuilding is inspected position by position, and each worn position is scheduled for its kit. Ordering at that stage keeps the rebuild moving in one pass and avoids opening the same section twice.

What should accompany a synchronizer kit enquiry to TOSEN?

An enquiry for this kit carries the gearbox code, the part number or the component markings from the removed parts, the relevant dimensions and the quantity. The gear position under repair and photographs of the mating components belong in the same message. With those details recorded, the quotation covers the kit that matches the Eaton Fuller assembly on the bench.