6R75 Shift Kit 2006-14

The 2006-14 in this title is a valve body generation, not a single model year. TransGo's SK 6R80-A kit is built for every GEN1 valve body Ford used in the 6R60, 6R75 and 6R80 from 2006 until the GEN2 design arrived, and the 6R75 sits squarely inside that window. If you drive a 5.4L Expedition or Navigator with the six-speed and you are fighting a shake at 30 to 45 mph, slipping hot upshifts or a bang into low gear as you stop, this is the repair kit aimed at those exact complaints. It is new, TransGo branded, and goes in through the pan.

What the shift kit does in a 6R75

The 6R75 is Ford's version of the ZF 6HP26. It gets six forward speeds from a Lepelletier geartrain, three driving clutches (A, B and E) and two brake clutches (C and D), all applied by solenoid-controlled hydraulics in the valve body. Every one of those applies is fed by line pressure from a single pressure regulator valve. TransGo traces the family's ratio codes and rough coast shifts to wear in that valve's bore and its balance bushing, and the converter shudder to a torque converter clutch regulator valve whose design and calibration needed an upgrade. The kit supplies a hardened two-piece steel PR valve with a new orange spring and end cap, plus a steel TCC regulator valve with a small white spring. Both new valves have longer lands that ride on bore surface the factory valves never wore, which is why no reaming tools are needed.

Symptoms that point to this kit

• A quiver at 28 to 46 mph that feels like an out-of-round tire but is really the converter clutch
• Converter clutch slip, seen as engine speed creeping up at a steady cruise
• Rough or erratic shifts as line pressure wanders
• Coast-down clunk as the truck slows to a stop
• Gear ratio error codes and shift solenoid performance codes with no electrical circuit fault

How to confirm the problem first

Check fluid before anything else. TransGo's instructions set the level at the top of the hash marks with the fluid at 190 F, read on a scan tool, because the cooler circuits have to purge air and a low or overfilled unit misbehaves. Then pull codes. A circuit code for a solenoid or speed sensor is an electrical repair, and our shift solenoid symptoms guide shows how to sort those out. If you are left with ratio or performance codes and the shudder, the hydraulic side is the suspect. Our Navigator shift problems guide walks through the full diagnosis on these trucks.

Fitment: GEN1 vs GEN2

This kit fits GEN1 valve bodies only. TransGo warns that some 2014, early 2015 and some new replacement GEN1 valve bodies look like GEN2 parts, with an extra filter hole on the bottom and an added valve body to case bolt hole, yet still use the GEN1 pressure regulator valve. The only sure test is to measure the original PR valve land: .495 in is GEN1 and takes this kit, .514 in is GEN2 and needs the G2 kit. A factory 6R75 predates GEN2, but if your valve body has ever been replaced, measure it. The kit does not fit ZF 6HP21, 28 or 34 units. Send us your year and VIN if you are unsure, and see our 6R75, 6R60 and 6R80 parts page for the rest of the family.

Install notes

• Mark each solenoid location (TCC, SSE, SSD, LPC, SSC, SSB and SSA) before removal and return each to the same bore.
• Measure the PR valve before installing anything; it confirms you have the right kit.
• Splitting the valve body halves often pulls the printing off the separator plate, so photograph the plate and all eight check ball locations first.
• GEN1 plates come in six-damper and two-damper versions; any plate hole over a damper pocket needs a damper. Replace crushed inserts with the six supplied, and replace broken wire retainers.
• If the bores beyond the PR valve are badly worn, a replacement 2006-2007 6R75 valve body or a 6R75 valve body may be the better buy.
• Refill with the fluid your owner guide specifies and set the level hot.

Does 2006-14 mean it only fits trucks built in those years?

It refers to the GEN1 valve body era. TransGo lists the kit for GEN1 6R60, 6R75 and 6R80 valve bodies from 2006 through 2014. Any 6R75 valve body that measures .495 in at the PR valve land takes this kit.

My replacement valve body has an extra filter hole. Is it GEN2?

Not necessarily. TransGo notes some late and replacement GEN1 valve bodies have the extra filter hole and bolt hole but still use the GEN1 PR valve. Measure the PR valve: .495 in is GEN1, .514 in is GEN2.

Will this make my Expedition shift harder?

It is a valve body repair kit, not a firm-shift performance kit. It restores stable line pressure and converter clutch control, so shifts return to normal rather than becoming harsh.

Do I need a new torque converter too?

Possibly. TransGo says a quiver that has gone on for more than a month or two may need the kit and a converter, though shops report the kit with a fresh fluid refill often clears it.

Does the kit come with solenoids?

No. It includes the PR and TCC regulator valves, springs, end cap, damper inserts and wire retainers. Replace solenoids separately if they are faulty or very high mileage.

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