6L90 Clutch Module, new and ready to install. Fits the 6L90. Ships fast from the USA.
A 6L90 that slips in a gear, flares on the upshift or smells burnt after a long pull with a trailer has almost always cooked at least one clutch pack. This listing is a new friction and steel clutch plate set for the GM 6L80 and 6L90 six-speed, the plate stack you need when the seals and hard parts are healthy but the frictions and steels are not. It suits Silverado and Sierra 2500HD and 3500HD owners, Express and Savana van fleets, and anyone rebuilding a 6L90 that came out with glazed or flaking plates.
The 6L90 has no bands. Its gears come from five multi-plate clutches: 1-2-3-4, 3-5-Reverse, 4-5-6, 2-6 and Low/Reverse, with a low sprag helping first gear. Every shift is one pack releasing while another clamps, so each stack of frictions and steels has to grip at a precise moment. Gears Magazine explains that the stator support feeds apply oil to the 1-2-3-4, 3-5-R and 4-5-6 clutches, and any leak in that path starves a pack and lets it slip. Once a friction glazes, the module cannot fix it with pressure, and the steels it runs against heat-check and warp. That is why the plates should be replaced as a set, frictions and steels together.
Check the pan first; fiber material is the clearest sign the plates are finished. Then work out which pack is slipping from the gears it affects. A slip only in fourth, fifth and sixth points toward the 4-5-6 clutch, which Sonnax describes as a common failure on these units because of limited piston contact area and a backing plate that bows. No Reverse or fifth-gear slip points toward the 3-5-R pack. GM bulletin PIP5429 notes that a mild 2-3 flare can be a normal characteristic, so do not condemn the plates on that alone. Our 6L90 3-4 clutch failure guide and the 6L80/6L90 3-5-R clutch guide walk through each pattern.
This set is listed for the 6L80 and 6L90 in Chevrolet, GMC, Cadillac and Hummer applications. The 6L90 is the heavy-duty unit in 2007-and-newer 2500HD and 3500HD pickups, Express and Savana vans, HD Suburbans and the Camaro ZL1 and Corvette Z06 and ZR1. ATSG lists about fifteen internal parts that differ between the 6L80 and 6L90, including a larger 3-5-R hub, so lay your old plates out pack by pack and match count, thickness and tooth pattern before you install. Send us your year and VIN if you want us to check it. Year-specific plate sets and every other part are on the 6L90 parts page.
| Fits | 6L90 |
| Part type | Clutch Module |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is a friction and steel clutch plate set for the 6L80 and 6L90. It does not include seals, gaskets, pistons or a filter, so pair it with an overhaul seal kit if the unit is fully apart.
It is listed for both, but the two units have different internal parts. Match the plate count and thickness of each of your old packs before installing, or send us your year and VIN.
Yes. Steels that ran against burnt frictions are usually heat-checked or warped, and reusing them shortens the life of the new frictions. This set includes both.
The 4-5-6 clutch is a well-documented weak point, especially on towing trucks, followed by the 3-5-R pack when its drum cracks or its feed circuit leaks.
Yes. Clear the transmission adaptive values with a scan tool and run the adaptive learn so the module relearns fill times for the new clearances.
