The Eaton Fuller K-3166 or K3166 is a genuine washer update kit covering RTX and RTXF 9-speed manual transmissions across 18 models, including the RTX-11709A/B/H, RTX-12709A/B/H, RTX-13709H, RTX-14709A/B/H, RTX-16709B/H, RTXF-11709H, RTXF-12709H, RTXF-13709H, RTXF-14709H, RTXF-16709B, and RTXF-16709H. The kit ships as a complete assembly of 13 components: one S-2688 mainshaft assembly, two gears (part numbers 4303412 and 4303420), two additional mainshaft gears (4302393 and 4302394), four washers (4302398), two washers (4303603), one M-shaft SPL key (4304614), one snap ring (16763), and three instruction letters (L-1096, L-1096-1, L-1096-2). Notes in Eaton parts manuals specify use of a 3-sided key only with certain components. Call us to confirm proper fit for your specific transmission serial number.
Features
Fits 18 Eaton Fuller RTX and RTXF 9-speed transmission models including RTX-11709, RTX-12709, RTX-14709, RTX-16709 and RTXF variants
Includes S-2688 mainshaft assembly (x1) as a core kit component
Supplied with 4 washers (4302398) and 2 washers (4303603) for mainshaft update
Contains 4 gears: part numbers 4302393, 4302394, 4303412, and 4303420
Includes M-shaft SPL key (4304614), snap ring (16763), and three Eaton instruction letters (L-1096, L-1096-1, L-1096-2)
Eaton parts manuals specify 3-sided key use only with certain updated components
