8L45 Clutch Module 2016, new and ready to install. Fits the 8L45. Ships fast from the USA.
This listing is the Raybestos STMGM45 steel clutch pack module for the GM 8L45 eight-speed, the transmission used from 2016 on in the Chevrolet Camaro, the Colorado and Canyon V6 trucks and Cadillac rear-drive sedans. It holds steels only, no friction discs. Rebuilders buy it when the old steels come out blued, glazed, warped or scored, the kind of damage that causes apply shudder and slip even with fresh frictions. If you are searching for why a rebuilt 8L45 still shudders on certain shifts, or you want a complete steel set to go with a new friction module, this is that part.
Each of the 8L45's five clutches is a stack of alternating friction discs and steel plates. When the piston applies, the steels squeeze the frictions and also soak up the heat of the slip that happens during every clutch-to-clutch shift. Raybestos describes its steels as OE thickness for maximum heat sink, with a surface finish meant to increase apply area and friction life. A steel that has lost its flatness or finish loads the friction unevenly, so the clutch grabs and lets go instead of applying smoothly. Because these clutches overlap across gears (the 4-5-6-7-8-Reverse clutch alone works in six ranges), one bad set of steels can affect most of the shifts.
Raybestos lists the module contents as:
That is a full steel set for all five clutches, made in the USA.
Steels can only be judged with the unit apart. Lay each plate on a flat surface and check for rock, then look for heat discoloration and scoring. If the frictions and steels look fine but the unit still flares or drops to neutral on the 3-4 shift, the cause is probably hydraulic or electrical: our 3-4 clutch failure guide covers the solenoid harness swap and worn clutch control valves, and the valve body symptoms guide covers pressure faults.
Our listing is labeled 2016 and Raybestos catalogs STMGM45 for the GM 8L45 2016-on. It is not for the 8L90, which uses its own steel modules with thicker bottom plates and different counts. GM revised several 8L-series clutch parts for 2018 and 2019, so measure each new steel against the one it replaces, matching tooth count, outside diameter and thickness, before you build the pack. If a plate does not match, stop and send us your year and VIN. Browse the rest of the family on the 8L90 and 8L45 parts page.
| Fits | 8L45 2016 |
| Part type | Clutch Module |
| Condition | New |
| Brand | Raybestos |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. STMGM45 is a steel clutch plate module only. Raybestos sells the matching 8L45 friction pack separately, and we list friction kits for the 8L45 as well.
Raybestos lists 18 plates: 3 C1 plus 1 C1 bottom steel, 2 C2, 5 C3, 3 C4 and 4 C5, which covers all five clutches in the 8L45.
Only if they are flat, in spec and free of heat marks. Blued, glazed or warped steels cause shudder and short friction life, which is why many rebuilders replace steels in a burned unit.
No. The 8L90 has larger packs with different steel counts and thick bottom plates. This module is cataloged for the 8L45 from 2016 on.
Use DEXRON HP, set the level hot through the check plug, then clear adaptives and perform the fast learn before driving through every shift.
