Symptoms
Harsh or delayed shifts, flare between gears, or just no service record. FCP Euro notes that the 722.9's most common failures are electronic.
The fix, step by step
- Drain the pan and the torque converter, replace the filter and pan gasket, refill with MB 236.15 ATF and set the level at the specified fluid temperature with a scan tool.
- AMSOIL lists the 722.9 total fill as 9.5 qt, and a drain-and-fill replaces only part of it.
- If shifts are erratic, have a scan tool read the gearbox fault codes before replacing parts.
Tools & part numbers
- Scan tool for ATF temperature
- fluid pump
- torque wrench
- new filter, gasket and plugs
Where to buy the parts
FUCHS 722.9 transmission service kit (filter, pan gasket, 2×5 L ATF)FCP Euro ↗Amazon ↗
FUCHS ATF 7134 FE (MB 236.15), 1 LFCP Euro ↗Amazon ↗
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Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.