6R80 Shift Kit 2006

If your F-150, Expedition, Navigator, Explorer or Mustang with a first-generation 6-speed shudders like it has a bad tire between about 28 and 46 mph, clunks on the coast down to a stop, or sets gear ratio codes that come and go, a worn pressure regulator circuit in the valve body is a common reason. This is a new TransGo valve body repair kit for the GEN1 Ford 6-speed family. The 2006 in the title is where the kit's coverage starts: TransGo lists its GEN1 kit for 2006-2014 Ford and Lincoln vehicles with the 6R60, 6R75 or 6R80, so it covers the early 6R60 and 6R75 trucks and SUVs as well as 2009-and-later 6R80 units.

What the shift kit does in a 6R80

The GEN1 6R80 valve body runs everything through the pressure regulator (PR) valve. After high mileage the PR valve and its balance bushing wear their bore, line pressure turns erratic, and every clutch apply gets softer and longer. The torque converter clutch regulator valve has its own calibration problem that shows up as a light shudder under light throttle. TransGo's kit replaces both with drop-in hardened steel valves. The new PR valve is a two-piece design with longer lands that ride on unworn sections of the original bore, so it restores sealing without reaming. The kit also includes a PR spring, two aluminum boost bushings, a steel TCC regulator valve with two calibration springs, new wire retainers and six new rubber damper inserts. It does not replace solenoids, and it is not a firm-shift performance kit; it is a repair kit for wear that Ford's valve body develops.

Symptoms this kit is built to correct

• A quiver or shudder at roughly 28 to 46 mph when the converter clutch applies
• TCC slip that comes back after a fluid change
• Soft, long or flaring shifts, especially once the fluid is hot
• A clunk on coast downshifts as you slow for a stop
• Gear ratio codes P0729 and P0731 through P0734
• Shift solenoid performance codes P0781 through P0784 and P0829

Harsh 1-2 shifts on early trucks, a wrench light with a forced limp gear, or a start in 5th are a different story. Those point at the lead frame, a solenoid, or software, and are covered in our 6R80 common problems guide.

How to confirm the valve body is the problem

Check the fluid first: TransGo calls for the level at the top of the hash marks with the fluid at 190 F, read on a scan tool, because a low level alone causes slips and shudder. Then look at stored codes and TCC slip on the scan tool. A shudder that only happens with the converter clutch applied, plus ratio codes without an electrical fault, points at the PR and TCC regulator circuits. If you have open or short circuit codes, work through our 6R80 shift solenoid symptoms guide before buying this kit. Our harsh shift guide covers the software and relearn side.

Fitment

This kit fits GEN1 valve bodies only, which TransGo lists as 2006-2014. Ford changed to the GEN2 valve body for builds after about December 2014, but some 2014 and early 2015 trucks, and some replacement GEN1 valve bodies, have the extra filter hole that makes them look like GEN2. The reliable check is the one in the instructions: pull the original PR valve and measure its land. A .495 in land is GEN1 and this kit fits. A .514 in land is GEN2 and needs the GEN2 kit instead. If you are not sure which unit you have, send us your year and VIN before ordering. Browse every part for this family on our 6R80 parts page.

Install notes

• Mark each solenoid's location before you pull it and put it back in the same bore. On 2011-and-later units the variable force solenoids carry a calibration number from 2 to 5, so a mixed-up pair causes shift complaints.
• Install the new PR valve, orange spring and end cap, and check that the valve moves freely before final assembly. Swap the TCC regulator valve and use the small white spring supplied.
• Replace any flattened rubber damper, check every wire retainer, and put the eight check balls back in their original spots. Splitting the valve body halves often lifts the printing off the separator plate, so photograph it first.
• Refill with Mercon LV and set the level hot as above. Expect firmer shifts for a while as the computer relearns.
• On a high-mileage valve body the solenoid regulator and lube regulator bores also wear, and the solenoids may be tired. That is the time for a 6R80 solenoid kit, or a complete 6R80 valve body if the casting is badly worn. If the clutches are already burnt, do the kit during a rebuild with a 6R80 master rebuild kit.

Will this kit fit my 2015 F-150 with the 6R80?

Probably not. Ford moved to the GEN2 valve body for most builds after December 2014, and this is the GEN1 kit. Some early 2015 trucks still have a GEN1 valve body, so pull the pressure regulator valve and measure it: .495 in means GEN1 and this kit fits, .514 in means GEN2.

Does it fix the 6R80 torque converter shudder?

It targets the 28 to 46 mph shudder caused by the TCC regulator valve, and TransGo notes that a fresh fluid refill along with the kit usually clears it. If the shudder has gone on for many months, the converter clutch lining may be damaged and need replacing too.

Will this make my 6R80 shift harder?

Not in the way a performance kit does. It restores the pressure regulator and TCC circuits to steady pressure, so shifts get crisper and stop flaring, but it is designed to correct worn-valve complaints rather than add a harsh shift feel.

Do I need to replace the solenoids at the same time?

Not always. If there are no solenoid codes and the unit has moderate mileage, the original solenoids go back in their marked locations. On valve bodies past roughly 140,000 miles TransGo recommends fresh solenoids and repairing the solenoid and lube regulator bores as well.

Can I install it with the transmission in the truck?

Yes. The valve body comes out through the pan, so the kit can go in as a valve body service without pulling the transmission. Set the Mercon LV level at 190 F afterward and allow time for adaptive relearn.

• 6R80 Common Problems and Fixes
• 6R80 Shift Solenoid Symptoms and Replacement
• 6R80 Harsh Shift Causes and Fix
• 6R80 F150 Shift Problems: Diagnosis and Fix