4L80E Banner Rebuild Kit, new and ready to install. Fits the 4L80E. Ships fast from the USA.
A 4L80E that slips on the 1-2 shift, flares into third under a trailer, or takes a long breath before it grabs Reverse is usually telling you the clutch packs and bands are worn, not that the whole transmission is scrap. This kit is the more complete of our 4L80E banner kits: along with the overhaul gasket and seal set and the friction clutch pack, it includes a front band, a rear band, a filter and a three-piece molded piston kit. The frictions come from BorgWarner or Raybestos and the seals from SEAL, so you can rebuild a tired 4L80E from Chevrolet and GMC 2500 and 3500 pickups, Suburban 2500s, Express and Savana vans or a Hummer H1 in one order.
The 4L80E uses five clutch packs (overrun, forward, direct, intermediate and fourth) plus two bands to make its four forward gears and Reverse. Every one of those clutches is applied by a hydraulic piston sealed with rubber, and every circuit depends on gaskets and sealing rings to hold pressure. A banner kit replaces those soft parts and the friction plates that actually transmit torque. What sets this version apart is the bands and the molded pistons. Bonded-lip pistons harden with heat, and a heat-glazed band will let the unit slide on engagement even with fresh plates, so having them in the box saves a second order once the case is open.
Heavy use makes things worse. Transmission Digest describes plow and tow trucks with the 4L80E arriving with fluid turned blue from heat, bushings discolored and anything plastic melted, and Sonnax notes that a worn boost valve sleeve can drive line pressure high enough to break clutch pistons and other hard parts. If you are rebuilding for that kind of duty, plan the valve body and pump work along with the soft parts.
A banner kit fixes worn clutches, not electrical faults. Scan for codes, check the speed sensors and the pressure control solenoid, and run a line pressure test before pulling the unit. Our 4L80E common problems guide lays out the six failures we see most and how to tell them apart, and the pressure control solenoid symptoms guide covers the slipping complaint that turns out to be electrical. If pressure is in spec and the unit still slides, the packs are worn.
This kit is listed for the 4L80E without a year range. The 4L80E was built from 1991, and in 1997 GM moved the cooler return to the center support, which changed many hard parts. Gasket sets and some seals differ between early and late units, so send us your year, VIN or the code on the transmission ID tag before ordering and we will confirm the kit matches. If you already know your range, the 1992-1996 banner kit and 1997-2011 banner kit are listed by year. Everything else for this transmission is on the 4L80E parts page.
| Fits | 4L80E |
| 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.
An overhaul gasket and seal kit, a friction clutch pack, a three-piece molded piston kit, a front band, a rear band and a filter. Steel plates and bushings are not included.
It is listed for the 4L80E without a year range. Because gasket and seal details changed over the 4L80E production run, send your year and VIN or the transmission ID tag code and we will confirm fitment before it ships.
The year-specific banner kits cover the overhaul seals and frictions. This one adds both bands, the molded pistons and a filter, which are the parts most often found heat-damaged once a slipping 4L80E is apart.
Use Dexron VI automatic transmission fluid, which replaces the earlier Dexron grades, and check the level with the transmission at operating temperature.
Clear stored codes after installation. Where the vehicle supports it, reset adaptive shift values with a scan tool, then drive through several light and heavy throttle shifts so the controller relearns shift timing.
