6R100 Shift Kit 2014, new and ready to install. Fits the 6R100. Ships fast from the USA.
If your Ford Super Duty with the 6R100 six-speed slams into drive, flares between gears when it is hot, or bangs a shift right after a rebuild, the problem is often not the clutches at all but oil leaking past worn valves in the valve body. This listing is the Sonnax Zip Kit, part number 6R80L-6R100-ZIP. It is a valve body repair kit rather than a performance shift kit: instead of raising pressure, it seals the leaks that let pressure wander. Sonnax builds it for the 6R100 and for 2015-and-later 6R80 units only.
The 6R100 is the heavy-duty member of the Ford 6R family, which grew out of the ZF 6HP26 design. Gear changes are handled by solenoids that send regulated oil to clutch control valves in the valve body. Each valve slides in an aluminum bore, and after years of heat and debris those bores wear oval. Oil then leaks past the valves, so the pressure the computer commands is not what reaches the clutch. Sonnax describes the kit as sealing pressure losses in the main line, solenoid regulator, reverse, clutch control and solenoid apply circuits.
The kit contents listed by Sonnax are a Clutch A control boost valve and sleeve kit, six valve body accumulator piston and spring kits, an O-ringed end plug kit and an O-ringed internal end plug kit, a pressure regulator sleeve, eighteen replacement solenoid O-rings, plus a testing spring and testing end plug. The parts drop in with no reaming or special tools, and a technical booklet with vacuum testing and rebuild tips comes in the box.
Scan for codes first. Solenoid circuit faults and lead frame problems are electrical and will not be fixed by a hydraulic kit. Check the fluid level with the engine running at operating temperature, since a low 6R unit can mimic every symptom above. If the codes and fluid are clean, the valve body is the next suspect. Our 6R valve body testing guide walks through the checks, and the valve body wear fix guide explains where bores wear and why sealing them works.
Sonnax states plainly that this kit fits the 6R100 and 2015-later 6R80 and will NOT fit 6R80 units from 2014 and earlier, which use a different valve body and a separate kit. The Ford fluid chart places the 6R100 in F-250 through F-550 Super Duty trucks with the 6.2L gas engine and the 2017-2019 6.8L V10. Because the 6R family looks almost identical from the outside, confirm the transmission code on the driver door label or the case tag before you order; our 6R identification guide shows where to look. If you are not certain, send us your year and VIN and we will check it. Other parts for this unit are in the 6R100 collection.
| Fits | 6R100 2014 |
| Part type | Shift Kit |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. Sonnax states this kit does not fit 6R80 units from 2014 and earlier. It is made for the 6R100 and 2015-and-later 6R80 valve bodies only.
No. It is a valve body repair kit. It restores the pressure the computer commands by sealing worn bores and adding new accumulator parts, rather than raising pressure for harder shifts.
No. Sonnax describes the Zip Valve parts as drop-in with no reaming or special tools. A clean bench, basic hand tools and the included instructions are what you need.
Mercon LV. Do not top off with a universal fluid; check level at operating temperature with the engine running.
Not by itself. Solenoid circuit codes are electrical faults. The kit does include new solenoid O-rings, which help when pressure leaks at the solenoid bores, but a failed solenoid or lead frame still needs to be replaced.
