8L45 Banner Rebuild Kit, new and ready to install. Fits the 8L45. Ships fast from the USA.
This is a banner rebuild kit for the GM 8L45 eight-speed automatic, listed for 2016 through 2018 units. The 8L45 is the lighter-duty member of the 8L family, found behind the four- and six-cylinder engines in the Camaro, Cadillac ATS, CTS and CT6, and in the 2017-2018 Colorado and Canyon. If your 8L45 slips, flares between gears, engages late into Drive or Reverse, or came out of the pan with burnt fluid and friction material, this kit supplies the soft parts a teardown needs in one box.
The kit ships as two components: a complete overhaul gasket and seal set for the 8L45, and an 8L45 friction module covering the clutch packs. It weighs about 7.9 lb boxed. It does not include steel plates. If your steels are blued, warped or heat-checked, plan to buy steels separately before the case is open, because reusing damaged steels against new frictions defeats the rebuild.
The 8L45 makes eight forward ratios with four planetary gearsets and five clutches, all hydraulically applied and individually controlled by variable force solenoids. Every one of those pistons depends on fresh lip seals and D-rings to hold apply pressure, and every shift depends on the friction surfaces matching what the factory programming expects. A banner kit replaces exactly those wear items: the seals that leak apply oil, the gaskets that seal the case and valve body, and the frictions that have glazed or burned. Hard parts such as drums, planets and the pump are reused if they inspect good.
Rule out the cheap causes first. GM Service Bulletin 18-NA-355 covers a 25 to 80 mph shudder on 8L45 and 8L90 vehicles that is cured with a full fluid exchange to Mobil 1 Synthetic LV ATF HP, not a rebuild. A delayed engagement or drop-out at a stop on early 8L45 units can also be trapped air in the C5 circuit: GEARS Magazine reports GM updated the 8L45 stator support (GM 24277230) with an extra check ball and passage changes to purge that air. Pull the pan and look at the debris before committing. Our 8L90/8L45 wear points guide covers what to inspect once it is apart, and the pump failure guide separates pressure problems from clutch problems.
This kit is listed for 8L45 and 8L45E units built 2016 through 2018, with the vehicle list covering the 2016-2018 ATS, CTS, CT6 and Camaro and the 2017-2018 Colorado and Canyon. Confirm the tag on the case reads 8L45 before ordering; the larger 8L90 uses different clutch packs and is covered by our 8L90 banner rebuild kit. GM revised the 2-3-4-6-8 clutch piston seal dimensions on the 8L90 starting in 2018, so on a 2018 8L45 compare the kit D-rings to the originals before assembly; they should push in with normal force, not be forced. If you are unsure, send us your year and VIN and we will check it. Browse every part for this family on the 8L90 and 8L45 collection page.
If the clutch drum pack is scored, the complete 8L45 clutch module saves rebuilding it piece by piece, and an 8L45 shift kit addresses worn valve body regulator bores while the unit is out.
| Fits | 8L45 |
| Part type | Banner Rebuild Kit |
| 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.
No. It contains the overhaul gasket and seal set plus the friction module. Steels are reused if they are flat and not heat-marked, or bought separately.
The kit is listed for 2016 through 2018 units. For a 2019 or later transmission send us the year and VIN so we can confirm seal and friction fitment before you order.
DEXRON HP. GM's shudder bulletin 18-NA-355 calls for Mobil 1 Synthetic LV ATF HP, which meets that spec. The 7.4 quart figure is a service refill, so a dry rebuilt unit needs more.
No. The 8L90 uses larger clutch packs and its own seal set. Use the 8L90 banner kit for that transmission.
Yes. Clear the old adapts and run the transmission adaptive learn with a scan tool, then drive it through every gear so the TCM learns the new clutch fill times.
