6R60 Shift Kit

Most Explorers on the road have a five-speed, so owners of the V8 models are often surprised to learn theirs has the 6R60 six-speed. These SUVs are now well past 100,000 miles, and the 6R60 complaints that come with age are consistent: a buzz through the floor around 40 mph, upshifts that stretch out once the fluid is hot, and a thud as the truck rolls to a stop. This new TransGo valve body repair kit targets those faults. TransGo's kit for this valve body is the SK 6R80-A, named for the larger 6R80 but listed for the 6R60 as well, so do not let the box label throw you.

What the shift kit does in a 6R60

The 6R60 is a Ford-badged ZF 6HP26 design. Its valve body and Mechatronic module control five clutches through electronic solenoids, and all of them rely on line pressure from one pressure regulator valve. Over many thousands of shifts that valve wears its aluminum bore and balance bushing, and the result is pressure that rises and falls on its own. The computer sees clutches taking too long to apply and starts setting ratio codes. Separately, the factory torque converter clutch regulator valve allows the converter clutch to quiver at light throttle. The kit fixes both with drop-in steel valves whose longer lands seal on fresh bore surface. Expect correct, consistent shifts afterward, not a race-car feel.

Symptoms on a V8 Explorer or Mountaineer

• Light-throttle vibration between roughly 28 and 46 mph that disappears when you accelerate harder
• Sliding or long shifts when the transmission is hot
• Coast-down clunk, worst after a long drive
• Gear ratio codes P0729 and P0731 to P0734
• Shift solenoid performance codes P0781 to P0784 and P0829

How to confirm it before you buy

Verify the transmission first. Ford's 2007 Explorer owner guide lists the 6R60 under its own transmission code and calls for MERCON SP, while the five-speed uses MERCON V, so the door label code and the fluid spec both tell you which unit you have. Next, check the level hot on a scan tool, because a low 6R60 slips and shudders like a worn one. Then read codes: open or shorted solenoid circuits are electrical problems, covered in our shift solenoid symptoms guide. Ratio and performance codes with good circuits point at the valve body. For harsh engagements rather than slips, our harsh shift causes guide covers the other possibilities.

Fitment

TransGo lists this kit for GEN1 6R60, 6R75 and 6R80 valve bodies. Every factory 6R60 is GEN1, but a used or replacement valve body could be something else. Pull the original PR valve and measure the land: .495 in confirms GEN1 and this kit; .514 in means GEN2 and a different kit. It does not fit the five-speed 5R55S found in V6 Explorers. If you are not sure what is under your SUV, send us the year and VIN before you order. The full 6R60 lineup is on our 6R60 and 6R80 parts page.

Install notes

• The job is done in the vehicle through the pan. Tag every solenoid so it returns to its original bore.
• Install the new PR valve, spring and end cap, reuse the original retainer, and confirm the valve moves freely before bolting up.
• Swap the TCC regulator valve and spring for the steel valve and small white spring in the kit.
• TransGo warns that valve bodies past about 140,000 miles often have worn lube and solenoid regulator bores, causing hot clunks, ratio codes and long slips that this kit alone will not cure. They also say high-mileage valve bodies need fresh solenoids. Early 6R60s use the 2006-2010 solenoid type without calibration numbers; an early-type solenoid kit or a single 2006 pressure control solenoid covers that, after you match part numbers.
• If clutch material is in the pan, a 6R60 clutch drum and a full overhaul may be needed alongside the kit.
• Refill with the fluid your owner guide specifies and check the level at operating temperature.

Which Explorers have the 6R60?

The V8 Explorer and Mountaineer from the 2006 model year on. V6 models of the same era used the 5R55S five-speed. The transmission code on the door label and your owner guide confirm which you have.

Why does the kit say 6R80 on it?

TransGo's GEN1 kit, SK 6R80-A, covers the 6R60, 6R75 and 6R80 together because they share the GEN1 valve body. The name comes from the most common unit.

My Explorer has 160,000 miles. Is this kit enough?

Maybe not on its own. TransGo says valve bodies past about 140,000 miles often have wear in the lube and solenoid regulator bores and need fresh solenoids, so plan for those repairs too.

What fluid goes back in?

Ford's 2007 Explorer owner guide lists MERCON SP for the 6R60. Follow the spec in your own owner guide and set the level hot.

Will it cure the 40 mph shake?

If the shake is converter clutch quiver, the new TCC regulator valve and spring are designed for it. A long-running shudder may also have damaged the converter clutch, which would then need replacing.

• 6R80 Shift Solenoid Symptoms and Replacement
• 6R80 Harsh Shift Causes and Fix
• 6R80 Common Problems and Fixes
• 6R80 Won't Shift Into Overdrive: Causes and Fix