The TF-81SC: It Moved When It Came In   There have been numerous cases on our technical hotline where a Ford 500 vehicle came into a shop for repairs requiring the removal of the TF-81SC (AF21) transmission. Once the repairs were completed or the transmission was rebuilt, the transmission did not engage into any gear […]

Does Your ZF5HP19 Go Bump and Clunk?   Audi or BMW vehicles, equipped with the ZF5HP-19/ FL/FLA may exhibit a condition of a firm engagement in the Drive position accompanied with a harsh coast-downshift. This condition will typically get more pronounced when hot. This condition seems to be more prevalent in vehicles 2003 and newer. […]

Hyundai KIA 6-Speed Transmission- Take A Look!     Hyundai has been quite forthcoming with providing technical data for its 6-speed transmission — much of which is required should the need arise to diagnose one of them. This transmission is used in both Hyundai and Kia vehicles as far back as 2009 here in the […]

Toyota A750E/F with Multiple Solenoid Circuit Faults   Toyota Tundra, 4Runner, Tacoma, Sequoia and FJ Cruiser equipped with the A750 transmission may exhibit a complaint of multiple transmission solenoid electrical circuit faults set.   Typically, to have multiple solenoid electrical faults indicates that there is a power loss or ground problems, possible compromised wiring harness (pinched, […]

FNR5/5NR5 Secondary Valve Body Variations   We have had may folks asking about the FNR5/5NR5 transmission. We decided to write up a short article about this. Read below and feel free to comment below. Complaint: When it becomes necessary to replace the secondary valve body in an FNR5/5NR5 transmission, the replacement valve body appears differently than […]

Fixing A U140E That Won’t Reverse   During an overhaul of a U140E transmission, it was determined that the original valve body needed replacement. After installation the vehicle had no reverse engagement unless the selector lever was moved around. When drive was selected, a severe delayed engagement was present.   When the selector lever was […]