8L45 Overhaul Kit 2016-2022, new and ready to install. Fits the 8L45. Ships fast from the USA.
This is a new master overhaul kit for the GM 8L45 eight-speed, listed for 2016 through 2022. Unlike a plain gasket-and-seal set, it includes friction plates and steel plates along with the overhaul gaskets and seals, so one box covers the soft parts for a full rebuild. It is aimed at the owner or shop with an 8L45 out of a Chevrolet Camaro or Colorado, GMC Canyon, or Cadillac ATS, CTS, CT4 or CT6 that is slipping, flaring between gears, slow to engage, or leaking from more than one seal.
The 8L45 makes its eight ratios with five multi-plate clutches. GM's 16-NA-019 bulletin charts every shift as one clutch applying while another releases, so a single glazed pack or leaking piston seal shows up across several shifts, not just one. Overhaul gaskets and seals restore the pressure circuits: piston seals, sealing rings, the case and valve body gaskets and the O-rings that keep each clutch feed tight. The frictions and steels restore the clutch capacity itself. Replacing both at once is the normal approach once a unit has slipped long enough to put clutch material in the pan, because seals alone will not save burned plates and new plates fed through tired seals will not last.
Several 8L45 complaints are not clutch failures. GM bulletin 18-NA-355 traces the 25 to 80 mph rumble-strip shudder on these transmissions to the fluid and cures it with a fluid flush, not a rebuild. Sonnax documents a 3-4 neutral caused by swapped S8 and S9 solenoid connectors and worn clutch control valve bores that bleed off apply pressure; our 3-4 clutch failure guide covers both, and the shift solenoid symptoms guide covers electrical faults. If a delayed engagement passes GM's 3-second input-speed test after a learn, leave the unit together.
The kit is listed for 8L45 transmissions from 2016 to 2022 and does not fit the 8L90, which has its own 8L90 overhaul kit. That year span crosses two GM changes worth checking. GEARS Magazine reports that from 2018 the 2-3-4-6-8 (C4) clutch piston, seals and wave plate were redesigned and the early and late seal dimensions differ, so your seal kit must match your piston. It also reports a 2019 spiral-groove friction for the 4-5-6-7-8-Reverse (C5) clutch on both the 8L45 and 8L90, tied to a calibration change and not meant for older units. Compare the kit's C4 seals and C5 frictions against what comes out of your unit, or send us your year and VIN before you order. The rest of the family is on the 8L90 and 8L45 collection page.
| Fits | 8L45 2016-2022 |
| Part type | Overhaul Kit |
| Condition | New |
| Brand | GM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Yes. It is a master kit with friction plates and steel plates plus the overhaul gaskets and seals. Hard parts such as drums, bushings and the pump are not included.
It is listed for 2016-2022, but GM changed the C4 piston seals in 2018 and the C5 frictions in 2019. Compare those parts against your unit or send us your year and VIN.
No. The 8L90 is a larger transmission with its own overhaul kits.
Probably not. GM bulletin 18-NA-355 cures that shudder with a fluid flush. Try that before any teardown.
Use GM's specified DEXRON HP, then run Service Fast Learn followed by the individual clutch learns in bulletin 16-NA-019.
