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Shifter Components For Peterbilt Trucks
The transmission shifter and its supporting components take constant use on a manual or automated manual transmission -- and worn shift knobs, damaged shift towers, stretched linkage, or failed air shift components make gear selection imprecise and fatiguing. We carry replacement shifter components for Peterbilt trucks equipped with Eaton Fuller and other heavy-duty transmission configurations.
Frequently asked questions about shifter components
What shifter components most commonly wear out on a Peterbilt with an Eaton Fuller transmission?
The shift knob and its internal components -- particularly the range and splitter buttons on an 18-speed -- are among the most frequently replaced shifter parts. Shift tower boots and covers crack from UV exposure and age. On trucks with air-shifted high/low and range valves, the small o-rings and valve components inside the shift knob or shift tower wear and cause slow or incomplete shifts. Shift linkage on older trucks can develop wear at the pivot points that introduces slop into gear selection.
Why does my Peterbilt's shift knob air button feel sluggish or fail to split gears?
Sluggish range or splitter shifts almost always indicate an air system issue rather than a transmission problem. The most common causes are a worn or torn o-ring inside the shift knob valve, a kinked or leaking air line between the knob valve and the shift cylinder, or low air pressure in the system. Check system air pressure first -- the transmission air system requires at least 60 PSI to shift reliably, and trucks with air leaks elsewhere in the system may have insufficient pressure during heavy braking or extended air usage.
Can I replace just the shift knob on my Peterbilt, or does the whole tower need to come out?
The shift knob is almost always a separate assembly that threads onto or snaps onto the shift tower shaft and can be replaced independently. Knob replacement on most Eaton Fuller shifter configurations is a straightforward job -- unscrew the old knob, disconnect the air lines, connect the new knob, and reinstall. The shift tower itself requires more work to remove but is also a separate replaceable assembly. In most cases, worn knob valve internals or a damaged knob can be addressed without removing the tower from the cab.