6F35 Shift Kit 2009-2013

This is a TransGo SHIFT KIT valve body repair kit for the first-generation Ford 6F35 six-speed, the version built from 2009 into the middle of the 2013 model year. It is what you want when a 2009-2013 Escape, Fusion, Milan, MKZ or Mazda Tribute with the 6F35 drops out of gear on the 2-3 shift, will not back up, hunts the converter clutch at cruise, or sets gear ratio and solenoid performance codes that keep coming back after a fluid service. The kit is new and comes with the valves, bushing, springs, separator plate and gaskets in the photo.

What the shift kit does in a 6F35

The 6F35 is a fully electronic transaxle: the TCM fires solenoids, and the solenoids steer oil to the clutches. That only works if the oil feeding the solenoids sits at a fixed, limited pressure. The solenoid pressure regulator valve sets that limit. As its aluminum bore wears, feed pressure wanders, so solenoid output wanders, and the TCM sees clutches applying too early, too late or not at all. TransGo's fix for the Gen 1 unit is a drop-in bushing and hardened steel regulator valve that restore the circuit inside the worn bore, so no reaming is needed. The kit also replaces the coated main pressure regulator valve with a two-piece hardened steel valve, adds a TCC regulator valve with a scarf-cut sealing ring that seals in a worn bore, and supplies an improved separator plate, because the original plate is known to let the D2 checkball blow through it.

Symptoms this kit addresses

• Engine flares or the transmission drops to neutral on the 2-3 upshift (2-3 cut loose)
• No reverse, often after the D2 checkball has pushed through the separator plate
• Erratic or hunting torque converter clutch at steady highway speed
• Gear ratio codes P0729 and P0731 through P0735, plus P0741 (TCC performance) and P1744
• Shift quality that changes from cold to hot, a sign of feed pressure moving with bore leakage

How to confirm the valve body is the problem

Scan for codes first and note which gear ratio codes are stored. Check fluid level and condition: dark fluid with clutch material points to burned packs that a valve body kit will not cure, and the 3-5-R clutch is the known weak spot in this family. If the fluid is clean, compare commanded versus actual pressure with a gauge or scan data. Our 6F35 transmission problems guide walks through separating a worn regulator bore from a clutch or wave plate failure, which is the call you need to make before ordering.

Fitment

This kit is listed for 6F35 transmissions from 2009 through 2013. TransGo builds it for Gen 1 units only, from 2009 to the 2013-1/2 changeover, and states it does not fit Gen 2. Because 2012 and 2013 vehicles can carry either generation, check the build date and the valve body before ordering, or send us your year and VIN and we will check it for you. For a Gen 2 unit, look at the other kits on our 6F35 parts page, including the 2012 6F35 shift kit listing.

Install notes

• Work through the TransGo instruction sheet in order and lay out the old valves as they come out; the kit only works if each piece lands in the right bore.
• Install the new separator plate and gaskets that come in the box. Do not reuse a plate with a damaged checkball seat.
• Clean the valve body thoroughly. Debris left in a bore can stick the new valves.
• If the fluid showed friction material, plan on a 6F35 master rebuild kit and inspect the 4-5-6 clutch drum while the case is open.
• Refill with Mercon LV only, check level hot at the check plug per Ford service information, then reset adaptive learning with a scan tool and drive through every gear so the TCM relearns shift timing.

Done right, this kit repairs the wear that causes most Gen 1 6F35 shift complaints, at a fraction of the cost of a replacement valve body.

Will this kit fit my 2013 Escape or Fusion?

Only if the transmission is a Gen 1 6F35. TransGo rates this kit for 2009 through mid-2013 Gen 1 units and says it does not fit Gen 2. A 2013 can go either way, so send us your year and VIN before ordering.

Do I need special tools or reaming?

Not for this Gen 1 kit. The solenoid regulator bushing and valve drop into the existing worn bore. The Gen 2 kit is the one that uses an oversized valve and needs TransGo's reamer tool kit.

Will it fix a no-reverse condition?

It can, when no reverse comes from the D2 checkball blowing through the separator plate, because the kit includes an improved plate. If the 3-5-R clutch or wave plate has failed, you need clutch parts as well.

Will the shifts feel harsh afterward?

This is a repair kit that restores correct pressure control rather than a race calibration. Expect consistent, firm shifts once the TCM relearns.

What fluid do I use?

Ford specifies Mercon LV for all 6F35 transmissions. Do not top off with a universal or Mercon V fluid.

• Ford 6F35 Transmission Problems: Real Causes and the Fixes That Last