The Eaton Fuller Heat Exchanger Kit, part number K-3972 or K3972, is the correct service kit for the heat exchanger group across a broad range of RTLO and RTLOF series transmissions. Per Eaton Fuller illustrated parts manuals, this kit supersedes earlier part numbers 5586609 and 5586620 and is listed as the current service part for models including the RTLO-12913A, RTLO-14913A, RTLO-16913A, RTLO-18913A, RTLO-20918B, RTLOF-12913A, RTLOF-14913A, RTLOF-16913A, RTLOF-18913A, and related 18B and T2 variants. Cross-reference K-3972 when sourcing a replacement heat exchanger service kit for these units. Call us to confirm proper fit for your specific transmission serial number.
Features
Genuine Eaton Fuller Heat Exchanger Kit, part number K-3972 or K3972
Supersedes Eaton Fuller part numbers 5586609 and 5586620
Listed in Eaton Fuller illustrated parts manuals for 17 RTLO and RTLOF series models
Covers RTLO-12913A through RTLO-20918B-T2 and matching RTLOF variants
Sold by Pro Gear and Transmission
