4L80E Banner Rebuild Kit 1997-2011, new and ready to install. Fits the 4L80E. Ships fast from the USA.
The 4L80E behind most 1997-and-later Silverado and Sierra 2500 and 3500 trucks, Suburban 2500s, Express and Savana vans and the Hummer H1 is a center-lube unit, and when it starts slipping under load or burning fluid this is the banner kit built for it. It pairs a full overhaul gasket and seal kit with a BorgWarner friction pack, is listed under part number HDK3400ELS, and covers both the 4L80E and the heavier-duty 4L85E built from 1997 on.
The clutch packs in the 4L80E are applied by pistons fed through sealing rings and lip seals, so pressure loss from hard seals and glazed frictions shows up as slip, flare and heat. This kit replaces both. In 1997 GM moved the cooler return from the pump to the center support so cooled oil reaches the middle of the geartrain, and Transmission Digest notes that many internal parts were redesigned to suit it. The seals and gaskets in this kit follow that later layout, which is why it is sold separately from the 1992-1996 kit.
Not every slip code on these trucks is the clutches. Transmission Digest reports that the converter clutch in 2000-and-later 4L80E units can crack just inside its rivet circle, setting a converter slip code that appears mainly when towing or on hills, and Sonnax lists the set conditions for codes such as P0741 and P0742. If the clutch packs are fine and only the converter clutch slips, a banner kit will not cure it. Have the converter checked by a rebuilder whenever you overhaul one of these units.
Scan for codes, verify both speed sensors and the solenoids, then check line pressure. Our Silverado 2500 4L80E problems guide and Express van 4L80E problems guide cover the failures specific to those trucks. Normal pressure plus slipping or a pan full of debris points to worn packs and the need for this kit.
This kit is listed for 1997 through 2011 4L80E and 4L85E transmissions. Within that range there are two center-lube generations: 1997-98 and 1999-and-later, when the planetary pinions grew from about 0.710 to 0.785 inch thick and the sun gear shaft changed. The kit itself covers soft parts, but if you are replacing a carrier, sun gear shaft or center support, match them to your generation. Read the ID tag on the case and send us your year, VIN or tag code to confirm. For an earlier unit see the 1992-1996 banner kit, and browse the rest of the lineup on the 4L80E parts page.
| Fits | 4L80E 1997-2011 |
| Part type | Banner Rebuild 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 listed for both the 4L80E and the heavier-duty 4L85E from 1997 through 2011. Confirm your unit from the ID tag on the case.
An overhaul gasket and seal kit plus a friction pack. Steel plates, bands, bushings and the filter are separate.
No. Units before 1997 return cooler oil through the pump rather than the center support, with different internal parts. Use the 1992-1996 banner kit for those.
Only if the clutch packs are the cause. 2000-and-later 4L80E converter clutches are known to crack and set a slip code under towing, so have the converter inspected during the rebuild.
Use Dexron VI ATF and check the level hot. Clear codes, then drive gently for the first few hundred miles while the controller relearns shift timing, avoiding heavy towing right away.
