6R75 Shift Kit 2006-2014

The 6R75 had a short production life. Ford put it behind the 5.4L V8 in the 2007-2008 Expedition and Lincoln Navigator, then replaced it with the 6R80 for 2009. That makes it a heavy-duty unit in a heavy vehicle: a three-row SUV that often tows, which is hard on the hydraulic circuits that hold the converter clutch and the shift clutches. If your 6R75 truck shakes at light throttle in the 28 to 46 mph range, clunks as you coast to a light, or shifts rough and then soft with no pattern, this TransGo SK 6R80-A GEN1 valve body repair kit is aimed at those faults. The 2006-2014 range in the title is the span TransGo gives for GEN1 valve bodies across the 6R60, 6R75 and 6R80.

What the shift kit does in a 6R75

Like the rest of the family, the 6R75 is derived from the ZF 6HP26, with six forward speeds from a Lepelletier geartrain and every shift handled clutch to clutch by solenoids in the valve body. Both the line pressure feeding those clutches and the pressure holding the converter clutch come back to two valves: the pressure regulator (PR) valve and the TCC regulator valve. When their bores wear, a 6R75 that is pulling a trailer or a full load of passengers feels it first, because the computer is already asking for high pressure and the worn circuit cannot hold it steady. TransGo's fix is a two-piece hardened steel PR valve with an orange spring and new end cap for the .495 in GEN1 bore, plus a steel TCC regulator valve and small white spring. The longer valve lands ride on parts of the bore that never wore, so no reaming is needed.

Symptoms this kit targets on 6R75 trucks

• Steady-throttle vibration that feels like a tire problem, but only while the converter clutch is applied
• TCC slip, seen as engine speed drifting upward on the highway
• Erratic line pressure: rough shifts, then sliding shifts once hot
• A coast-down clunk as the truck slows
• Ratio or shift performance codes with no solenoid circuit code

Rule out the known software fix first

One common 6R75 complaint is not a valve body problem at all. Transmission Digest documents a harsh 2-1 downshift under 10 mph on 2007-2008 Navigators with the 5.4L and 6R75 built on or before April 17, 2008. The cause is PCM calibration, the fix is a reprogram followed by an adaptive learn drive cycle, and the article notes the complaint can survive an overhaul if the software is not updated. So if a hard 2-1 at a stop is your only symptom, start there. For everything else, check that the fluid is at the right level hot, then scan for codes. Circuit codes point at solenoids or wiring, covered in our shift solenoid symptoms guide. Our Expedition shift problems guide and Navigator shift problems guide walk through the full diagnosis on these trucks.

Fitment

Factory 6R75 applications are the 2007-2008 Ford Expedition and the 2007-2008 Lincoln Navigator with the 5.4L. All of them were built with GEN1 valve bodies, well before Ford's GEN2 change for 2015. If the valve body has ever been replaced, pull the original PR valve and measure the land: .495 in is GEN1 and takes this kit, .514 in means you need the GEN2 kit instead. The kit fits stock factory bore sizes only. If you are not sure what your truck has, send us the year and VIN, and see our 6R75 and 6R80 parts collection for the rest of the family.

Install notes

• Remove the valve body through the pan. Mark all seven solenoid locations before pulling them and return each one to its own bore.
• If you split the valve body halves, watch the separator plate printing, which usually pulls off. TransGo shows eight check balls and six damper locations on GEN1 units; put every small part back exactly where it came from.
• Check each wire retainer as you go. They break often, and the kit includes spares.
• On a valve body with 140,000 miles or more, TransGo says the solenoids should be renewed too; our 6R75 solenoid kit covers the early-style units.
• If clutches are burnt or the truck has a slipping gear, rebuild with a 2007-2008 6R75 overhaul kit and install the shift kit during that job.
• Fill and check the level hot, at 190 F on a scan tool, to the top of the hash marks. Then let the transmission relearn over a few days of normal driving.

What trucks use the 6R75?

The 2007-2008 Ford Expedition and 2007-2008 Lincoln Navigator with the 5.4L V8. Ford switched those trucks to the 6R80 for 2009, and the 6R80 GEN1 also takes this kit.

My Navigator bangs into first as it stops. Will this kit fix it?

Possibly not. A harsh 2-1 downshift under 10 mph on 2007-2008 Navigators built on or before April 17, 2008 has a known PCM reprogram fix. Have the software checked first; the kit addresses converter quiver, erratic pressure and coast clunk.

Is this the same kit sold for the 6R60 and 6R80?

Yes. TransGo's SK 6R80-A covers 6R60, 6R75 and 6R80 GEN1 valve bodies from 2006 to 2014, all of which use the .495 in pressure regulator valve.

Do I need to remove the transmission?

No. The valve body comes out from under the truck after the pan is removed. Many builders also install the kit during a full overhaul.

How do I check the fluid after the install?

TransGo specifies the level at the top of the hash marks with the fluid at 190 F, read on a scan tool, so air purges from the cooler circuits. Do not leave it low or overfilled.

• 6R80 Expedition Shift Problems: Diagnosis and Fix
• 6R80 Navigator Shift Problems: Diagnosis and Fix
• 6R80 Shift Solenoid Symptoms and Replacement
• 6R80 Harsh Shift Causes and Fix