722.6 Shift Kit, new and ready to install. Fits the 722.6. Ships fast from the USA.
If your Mercedes, Sprinter, Jeep Grand Cherokee, Chrysler 300 or Dodge with the 5-speed 722.6 (Chrysler calls it the NAG1, Mercedes the W5A580) flares on the 2-3 shift, feels soft under load, or shudders when you leave a stop on hard throttle, this is the kit most rebuilders reach for. It is the TransGo SK722.6-A, a drop-in valve body repair kit for 1996 and newer 722.6-equipped vehicles that goes in without pulling the transmission.
The 722.6 is electronically controlled, but line pressure, clutch overlap and converter apply are still regulated by spool valves in the valve body. Over time the working-pressure regulator valve wears its bore, the overlap regulator bushings wear, and a couple of small valve springs break. The result is a slow pressure rise during shifts, which the driver feels as a flare between gears and the computer may log as a converter clutch fault. TransGo's answer is to replace the worn hardware rather than simply stiffen everything.
Per TransGo, the kit contains three new overlap regulator valve bushings, a hardened pressure regulator valve with longer lands that rides on unworn areas of the original bore, a complete lube pressure regulator valve, bushing, spring and sleeve assembly, plus new control pressure regulator and 2-3 shift pressure valve springs. That combination restores a correct pressure rise and converter apply pressure instead of masking wear.
Start with the basics: check fluid level on the correct temperature procedure and use only an MB 236.14 approved fluid, because a low or wrong fluid gives the same flare. Scan for codes next. If you see solenoid or speed sensor faults (P0715 or the P0748-P0753 range) the problem is likely the conductor plate or solenoids, not the hydraulic wear this kit fixes. Our 722.6 C-Class shift problems guide walks through that split, and the E-Class shift problems guide covers adaptation resets and converter shudder that can mimic valve body wear. A shop with a vacuum tester can confirm regulator and overlap bore wear in about an hour.
This kit fits 722.6, W5A330, W5A580 and NAG1 transmissions in 1996 and newer Mercedes-Benz, Chrysler, Dodge, Jeep, Sprinter, Jaguar and Porsche applications. One honest caveat: the 722.6 used two sizes of pressure regulator valve. This kit carries the smaller valve, which covers most units. Some high-output V8 and turbocharged applications use the larger valve, so pull your valve body and measure, or send us your year, model and VIN before ordering. The full 722 series parts collection lists other valve body and electrical parts for these units.
If the transmission already slips in a gear after the kit is in, the clutch packs are worn and a 722.6 master rebuild kit is the next step; install the shift kit during that overhaul.
| Fits | 722.6 |
| Part type | Shift Kit |
| Condition | New |
| Brand | TransGo |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. The valve body is serviced from under the vehicle after removing the pan and filter, so the kit can be installed in the vehicle.
It is designed to restore the correct pressure rise and overlap timing by replacing worn bushings, valves and broken-prone springs, not to make shifts violent. Most drivers notice firmer, cleaner shifts without flare.
Yes, the kit covers 722.6, W5A580 and NAG1 units. The exception is units with the larger pressure regulator valve found in some high-output V8 and turbocharged versions, so measure your valve or send us your VIN.
It can when the cause is worn lube and pressure regulator hardware lowering converter apply pressure. If shudder survives the kit, check the converter and input shaft seal circuit.
Use an MB 236.14 approved ATF for the 722.6 and do not mix it with 236.15 or 236.16 fluids.
At minimum the pan gasket, filter and fluid. If the conductor plate pin connector is leaking, replace its seal while the valve body is out.
