The Eaton Fuller Input Shaft Assembly S-1409 (also listed as S1409 or by Eaton part number 18837) is a genuine Eaton Fuller drivetrain component for RTO and RTX series heavy-duty transmissions. The parts manual describes it as a 2-inch pull input shaft with seal, used with front bearing cover 18699. It appears in the illustrated parts lists for over 45 Eaton Fuller transmission models spanning the RTO-11608LL, RTX-11609A, RTX-15615, and related RTOF and RTXF variants. Cross-references include Mack 3088-S1409, Navistar 1646888C1, and Navistar 1681295C91. Call us to confirm proper fit for your specific transmission model.
Features
Genuine Eaton Fuller Input Shaft Assembly, part number S-1409 or S1409
Eaton internal part number 18837
2-inch pull input shaft, supplied with seal
Designed for use with front bearing cover (FBC) 18699 per manual notation
Fits RTO, RTX, RTOF, and RTXF series Eaton Fuller transmissions (45+ models)
Cross-references: Mack 3088-S1409, Navistar 1646888C1, Navistar 1681295C91
