6R100 Shift Kit 2015

The 2015 in this listing's name marks the year Ford switched the 6R family to its second-generation valve body, and that is the casting this kit is built for. It is the TransGo SK 6R80-G2, a drop-in valve body repair kit for the Gen 2 6R80 from 2015 on and the 6R100 from 2017 on. Super Duty owners usually find it while chasing a light-throttle quiver around 30 to 45 mph that feels like a bad tire, a clunk as the truck coasts to a stop, or gear ratio codes on a transmission that otherwise shifts.

What the shift kit does in a 6R100

Ford's fluid chart puts the 6R100 behind the 6.2L gas V8 in F-250 through F-550 trucks, and behind the 6.8L V10 for 2017-2019. Inside the pan, seven solenoids on the valve body (TCC, SSA through SSE and LPC) meter oil to latch and regulator valves that apply each clutch, and all of them depend on line pressure set by the pressure regulator (PR) valve. When the PR bore wears, pressure swings; when the TCC regulator valve cannot hold a steady feed, the converter clutch slips in and out and the truck shudders.

TransGo's fix replaces both valves rather than raising pressure across the board. The box holds a patented two-piece hardened steel PR valve with a new boost valve, a large white PR spring and a four-groove end cap, a steel TCC regulator valve with a small white spring, six solenoid damper rubber inserts and four spare bore plug wire retainers. The longer valve lands ride on unworn parts of the bore, so no reaming is needed.

Symptoms that point to this kit

• Quiver or shudder from roughly 28 to 46 mph while lockup is applying
• Soft, sliding or occasionally harsh shifts that change with temperature
• Clunk on coast-down to a stop
• Ratio codes P0729 and P0731 to P0734 with clean fluid
• Shift solenoid performance codes P0781 to P0784 and P0829

How to confirm the cause before you buy

Scan for codes and check the fluid hot first. A vibration that disappears the moment lockup is commanded off is a TCC circuit problem, and our 6R converter shudder guide shows how to test that on the road. Ratio codes with no circuit faults and no burnt smell suggest pressure loss in the valve body, which the incorrect gear ratio guide explains step by step. If the pan is full of clutch material, a valve body kit alone will not save it. TransGo also says a shudder ignored for months may have damaged the converter as well.

Fitment: does a 2015 6R100 take it?

TransGo lists this kit for the 6R80 Gen 2 built from January 2015 and the 6R100 from 2017, and the instructions call for the non start-stop valve body on the 6R100. That means a 2015 or 2016 6R100 is not covered by the label even though this listing carries the 2015 year, so do not assume. The only reliable test is the one TransGo prints: pull the original PR valve and measure it. A .514 in valve is Gen 2 and takes this kit; a .495 in valve is Gen 1 and needs the earlier SK 6R80. Some late 2014 and early 2015 castings and some new replacement Gen 1 bodies have the extra filter hole and look like Gen 2, so measure even if the casting looks right. Browse every part for this unit on our 6R100 collection page, or send us your year and VIN and we will check it.

Install notes

• Mark each solenoid's bore before pulling it and put it back in the same spot.
• If you replace a variable force solenoid, match the calibration number (2 to 5) printed between the QR code and the connector; brown snouts are TCC, SSA and SSC, black snouts are SSD, LPC and SSB.
• Gen 2 separator plates use bonded gaskets; TransGo lists FL3Z-7Z490-D as the latest plate for both versions.
• Return all eight 6 mm plastic check balls to their original pockets and swap any flattened dampers for the new inserts.
• Check every wire retainer, since they break often, and confirm the new PR valve moves freely before the valve body goes back on.

TransGo warns that valve bodies past about 140,000 miles also wear the lube and solenoid regulator bores and need fresh solenoids, so a tired unit may be better served by a new 6R100 valve body. Doing a full rebuild at the same time? Pair the kit with the 2015-2023 6R100 overhaul seal kit. Refill with Ford Mercon LV and run the adaptive relearn covered in our relearn guide.

My 6R100 is a 2015. Will this kit fit it?

Not by the label alone. TransGo lists the 6R100 from 2017 on. Pull your PR valve and measure it: .514 in means a Gen 2 valve body that takes this kit, .495 in means Gen 1 and the SK 6R80 kit instead. Send us your VIN if you want us to check before ordering.

Is this the same kit sold for the 2015-up F-150 6R80?

Yes. The SK 6R80-G2 covers the Gen 2 6R80 built from January 2015 and the 2017-on 6R100, because both use the same second-generation PR valve size.

Will it stop the shudder around 30 to 45 mph?

That quiver is the main complaint TransGo designed the TCC regulator valve for. If the shudder has gone on for months, the converter clutch itself may be damaged and need replacing too.

Do I need to replace solenoids at the same time?

Not always. TransGo says valve bodies over roughly 140,000 miles also need fresh solenoids. If you replace any variable force solenoid, match the calibration number on the old one.

What fluid goes back in?

Ford specifies Mercon LV for the 6R100. Set the level hot with the engine running, then run an adaptive relearn so shift timing adjusts to the repaired valve body.

• 6R80 Torque Converter Lockup Shudder Fix
• 6R80 P0730: Incorrect Gear Ratio Causes and Fix
• 6R80 Valve Body Wear: Symptoms and the Bench Fix
• Adaptive Relearn After a Valve Body Swap or Rebuild