8L90 Clutch Module 2015, new and ready to install. Fits the 8L90. Ships fast from the USA.
This is a new Raybestos friction module, part number RHT96-322, for the GM 8L90 eight-speed automatic from the 2015 model year on. It is the friction plate set a rebuilder reaches for when an 8L90 out of a Silverado or Sierra 1500, Tahoe, Yukon, Escalade, Camaro or Corvette has started slipping in certain gears, flaring between shifts, or dropping burnt friction material into the pan. The listing describes it as frictions only, so plan on reusing good steels or sourcing steels separately.
The 8L90 builds eight forward ratios and reverse from four planetary gear sets and five friction elements, and GM names each element for the gears it is applied in: 1-2-7-8-Reverse, 1-2-3-4-5-Reverse, 1-3-5-6-7, 2-3-4-6-8 and 4-5-6-7-8-Reverse. Every shift is a clutch-to-clutch swap, with one pack releasing while another applies under computer control. GM bulletin 16-NA-019 charts that sequence; the 3-4 upshift, for example, applies the 4-5-6-7-8-Reverse clutch while the 1-3-5-6-7 clutch lets go. Because the timing is that tight, a friction surface that has glazed or lost thickness throws off fill time and holding capacity, and the control module can only adapt so far before the shift flares or slips.
Not every 8L90 slip is a friction problem. Sonnax has traced the infamous 3-4 neutral to S8 and S9 solenoid connectors swapped on the harness, and to worn clutch control valve bores that bleed apply pressure. Valve bodies with excessive line pressure can also damage packs and drums. Pull a scan for codes, check fluid level and condition, and run the adaptive learns first. Our 8L90 3-4 clutch failure guide walks through separating a burned pack from a hydraulic or wiring fault, and the 8L90 common problems guide covers the shudder and pressure complaints that get blamed on frictions.
The listing covers the GM 8L90 from 2015 up. Two production changes matter when you match frictions to your unit. GEARS Magazine reports that in 2019 GM switched the 4-5-6-7-8-Reverse frictions from a radial groove pattern to a spiral groove pattern along with a calibration change, and that the new discs were not meant to back-service earlier units. GEARS also reports the 1-3-5-6-7 drum was built in four-clutch and five-clutch versions, coded 8L90A or 8L90B beside the QR code on top of the drum, which changes how many frictions that pack takes. Lay your old plates next to the new set and count them pack by pack before you build. This module is for the 8L90 only; the smaller 8L45 uses its own frictions. If you are unsure, send us your year and VIN, or browse every part for the unit on our 8L90 parts page.
| Fits | 8L90 2015 |
| 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. The listing describes it as frictions only. Reuse your steels if they are flat and not heat-blued, or buy a complete rebuild kit if the steels are damaged.
It is listed for 2015-up 8L90 units. GM changed the 4-5-6-7-8-Reverse frictions to a spiral groove design in 2019 with a matching calibration, so compare the groove pattern on your old plates to the new set before assembly, or send us your VIN to confirm.
No. The 8L45 is the lighter-duty version of the family and uses different clutch plates. This module is for the 8L90.
GM specifies DEXRON HP for the 8L90. Fill to the correct level using the hot fluid check procedure, then complete the fast learn and adaptive drive learns with a scan tool.
Yes. New frictions change fill time and apply feel, so the transmission control module has to relearn each clutch. Without it you can expect harsh or flared shifts until it adapts.
