6R75 Shift Kit 2015-2019

Read this before you order: the Ford 6R75 itself was a 2007-2008 Expedition and Navigator transmission, and every factory 6R75 left the plant with a first-generation valve body. This listing is the second-generation kit, TransGo's GEN2 SHIFT KIT for the 2015-2019 six-speed, so it belongs on the later trucks that carried the family forward: the 2015-2017 Expedition and Navigator with the 3.5L EcoBoost, the 2015-2017 F-150, and late automatic Mustangs, all running the 6R80. If you own an original 2007-2008 6R75 truck, the kit you want is the 6R75 GEN1 shift kit. If your 2015-or-later Ford shakes at light throttle between roughly 28 and 46 mph, bumps on the coast down to a stop, or sets gear ratio codes, keep reading.

What the shift kit does in the GEN2 valve body

The six-speed in these trucks is Ford's version of the ZF 6HP26: three driving clutches (A, B and E), two brake clutches (C and D) and a Lepelletier geartrain, all applied by solenoids in the valve body. Two valves decide how well that works. The pressure regulator valve sets line pressure for every clutch, and the TCC regulator valve controls how firmly the converter clutch locks. On the GEN2 casting the regulator rides in a larger .514 in bore, and TransGo traces the common complaints to wear in that bore and in the regulator balance bushing, plus a factory TCC regulator design that lets the converter clutch hunt. The kit swaps in a hardened steel two-piece regulator valve, an aluminum boost bushing and a steel TCC regulator valve. Their longer lands seal on sections of the bore that never wore, so the job is drop-in, with no reaming and no special tools.

Symptoms on 2015-2019 trucks

• A shimmy that feels like an out-of-balance tire between about 28 and 46 mph, only when the converter clutch is applied
• Converter clutch slip that shows up as rpm creeping on the highway
• Shifts that run long and soft, especially hot and under a load
• A clunk on the coast-down downshifts
• Gear ratio codes P0729 and P0731 to P0734, or shift error codes P0781 to P0784 and P0829

How to confirm before you buy

Fluid level first, checked hot, then a scan. Codes for a solenoid circuit, the range sensor or a speed sensor point at the electrical side, not the regulator bore, and on the six-speed that usually means the lead frame or a solenoid. Our Expedition shift problems guide and Navigator shift problems guide separate those faults from valve body wear on the big SUVs, and the harsh shift causes guide covers adaptive relearn issues that can feel the same. When the electrical side tests clean, the fluid is right and the complaint is quiver, slip or flare with ratio or shift error codes, worn regulator bores are the prime suspect and this kit is the repair.

Fitment

TransGo lists this kit for Ford and Lincoln GEN2 valve bodies built from January 2015 on, with or without start-stop, and for the 6R100 from 2017. It is not correct for any factory 6R75, any 6R60, or a 2006-2014 6R80. TransGo also warns that some 2014 and early 2015 trucks, and some new replacement GEN1 valve bodies, look like GEN2 castings because they have the extra filter hole but still use the smaller regulator. So pull the original regulator valve and measure it: .514 in is GEN2 and this kit fits; .495 in is GEN1 and needs the 2006-2014 GEN1 kit. The kit fits stock factory bore sizes only. Send us your year and VIN if you want a second check, and see the 6R75 and 6R80 parts collection for the rest of the family.

Install notes

• The valve body comes out through the pan. Mark all seven solenoid positions (TCC, SSE, SSD, LPC, SSC, SSB, SSA) and return each to its own bore.
• Measure the old regulator valve before anything new goes in, then fit the large white spring inside the new boost valve, the new regulator valve and the four-groove cap, reusing the original retainer. The valve must move freely.
• Start-stop units use a two-neck filter and a small electric auxiliary pump, so keep their extra parts in place.
• Replace flattened solenoid damper inserts with the six in the kit, and any cracked bore plug retainer with the four spares.
• If the solenoids themselves are tired, do them on the same pan drop with a remanufactured 6R80 solenoid kit. A valve body with damaged bores beyond stock size needs a 2015-2019 6R80 valve body instead.
• Refill with Mercon LV and set the level hot, then allow a few days of normal driving for the shifts to relearn.

I have a 2008 Expedition with the 6R75. Is this the right kit?

No. Every factory 6R75 uses a GEN1 valve body with the .495 in pressure regulator. This GEN2 kit only fits the .514 in regulator used from 2015 on, so order the GEN1 6R75 kit instead.

Which trucks does this kit fit?

GEN2 six-speed valve bodies from January 2015 on, such as the 2015-2017 Expedition, Navigator and F-150, plus the 6R100 from 2017. Always confirm by measuring the original regulator valve.

What comes in the kit?

A hardened steel two-piece pressure regulator valve, an aluminum boost bushing, a steel TCC regulator valve, two calibration springs, four bore plug wire retainers and six solenoid damper inserts.

Will it stop the shake at 30 to 45 mph?

That 28 to 46 mph quiver from the converter clutch is the main complaint the TCC regulator valve corrects. Check fluid level and condition first, and if the converter itself is damaged it may still need replacing.

Do I need to pull the transmission?

No. The valve body comes out after the pan is removed. Mark every solenoid location before you take them out.

What fluid goes back in?

Mercon LV, checked hot to the correct level. Do not add supplemental additives; Ford's fluid chart warns against them.

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