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8L90 Transmission parts

M5U

Transmission general data

Number of gears Transmission Type Drive Torque (Nm) ATF (full capacity) L ATF (change) L ATF type (recommended)
8 AT RWD/AWD 1000 11,7 6 Dexron HP

The RWD automatic transmissions with longitudinal positioning Hydra-Matic 8L90 (M5U) and 8L45 (M5N, M5T) were designed in 2015 for Cadillac CT6 with new engines (3.6 liters) and also suitable for 6-liter engines V8. The design of this modern transmission is similar to 8HP by ZF and has a lot of same "features", like Start-Stop system on at traffic lights, used to save more fuel.


What are you looking for?

Overhaul Kit | Friction Kit | Friction | Steel Plate | Steel Kit | Band | Solenoid Kit | Solenoid EPC | Solenoid TCC | Pump | Shaft | Drum | Valve body | Torque converter | Hub | Piston | Piston Kit | Planetary Gear | Filter | Gasket | Bushing | Seal | Bearing | Pressure Plate | Stator | Differential | Retainer | Inhibitor Switch | Instruction manual | TOOLS & ACCESORIES | Sensor

Related transmission models or modifications of this transmission:

Which cars run with this gearbox? CLICK

Technical issues and repair guidelines

The transmissions has much higher reserve on components than its German competitor and should operate at least 200-300 thousand kilometers before the first overhaul ( under the condition of well-timed ATF change). In case of frequent “kickdown” usage with a switch-on of controlled slipping of the lock-up clutch, the wear-out of friction elements occurs quite rapidly and contaminates the valve body, fluid and filter. The filter is made of plastic with a two-layer felt membrane and its better to change this part in a timely manner.


The oil and filter should be changed when there are any suspicions related to oil transparency. Such situations may occur after travelling 40 thousand kilometers or 80 thousand kilometers depending on driving style and adherance to the transmission warm-up rule before driving in winter time. Removal of the pan allow specialists to estimate the level of components wear-out and valve body contamination.

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