When visiting WiWi’s Transmissions in Miami on a hot Saturday morning, there was a 2007 Dodge Ram 3500 with a 6.7L diesel and an AS68RC transmission in failsafe along with a serious delayed engagement into reverse.
GM’s 6L40/50/80 series rear wheel drive transmissions referred to as GM6 may come in to the shop experiencing a complaint of a delayed reverse accompanied with a slipping reverse as well as a flare or slide 2-3 shift.
After a good long test drive to relearn the shift adapts, sometimes a shifting or engagement problem remains. Assuming that there is not excessive wear in the valve body and the linear solenoids are good, the clutch control valves on the valve body can be adjusted to correct these problems.
As time has progressed, we are seeing more transmissions having solenoids handling both the shift scheduling and shift feel simultaneously. Performance codes for these types of solenoids have a different approach than say, a shift solenoid being used to just control shift scheduling.
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.
The ZF6HP19, ZF6HP26 and ZF6HP32 are considered ZF-6 speed series Generation or version 1 transmissions. Consequently, ZF6HP21, ZF6HP28 and ZF6HP34 are considered as Generation or version 2 ZF-6 speed transmissions.
Diagnostic Trouble Codes are no doubt quite helpful when diagnosing a malfunctioning vehicle. Sometimes, when the scan tool reports a never ending list of trouble codes, it might be a bit overwhelming to know where to start.
The U140/240 and 150/250 front wheel drive series transmissions has had and continues to have issues related to the quality of shift transitions. Most times resetting the shift adapts after repairs, rebuild or the replacement of a transmission handles the problem.
The programming for the opening day of the Southern Automotive Conference (SAC) added two key pieces with the recent announcement that Micheline Maynard will deliver a keynote on the future of the automotive industry and that Laurie Harbour will lead a supplier excellence panel.
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