6R140 Transmission Overhaul Kit with Bonded Pistons

This is the soft-parts side of a Ford 6R140 TorqShift rebuild in one box: metal-clad seals, pan and case gaskets, o-rings, lip seals and the Teflon sealing rings, plus the bonded piston set that most overhaul kits make you buy separately. TransTec kit 81001022, piston set 49125377.

The 6R140 is the six-speed automatic behind the 6.7L Power Stroke and the 6.2L and 6.8L gas engines in F-250, F-350, F-450 and F-550 Super Duty trucks from 2011 up, plus the F-53 and F-59 chassis. When one of these comes apart for a clutch job, a converter, or a burnt direct pack, every rubber and Teflon seal in it gets replaced at the same time - reusing a set that has been heat-cycled behind a diesel is how a fresh rebuild comes back with a slow 3-4 shift or a leaking pump.

The bonded pistons matter here. The 6R140's molded piston seals harden and crack with age and mileage, and a piston with a cracked lip bleeds apply pressure past itself: the clutch pack slips, glazes, and the unit is back on the bench. Because they are bonded rather than loose-seal, you drop them in as assemblies rather than fighting individual lip seals onto the piston hub.

TransTec is Freudenberg's transmission seal line and has supplied the rebuild trade since 1978. Check your unit's build before ordering - this kit covers 2011-up 6R140 and 6R140W applications.