4L80E Master Rebuild Kit, new and ready to install. Fits the 4L80E. Ships fast from the USA.
When a 4L80E in a Chevrolet or GMC 2500 or 3500, Suburban 2500, Express or Savana van or Hummer H1 is slipping, burning fluid, or has been towing heavy until the clutches gave up, a master rebuild kit is the starting point for the overhaul. This kit is new and built around Raybestos friction material. The photo shows the clutch frictions, a band, molded pistons, the gasket set and the sealing rings and O-rings needed to put the unit back together. It is for the builder who wants one box of matched soft parts instead of piecing an overhaul together from separate orders.
The 4L80E is a heavy-duty four-speed built for trucks and vans, and most of its failures are wear and heat rather than broken hard parts. Clutch packs glaze, seals harden, bushings wear, and the plastic parts inside soften when the fluid has been cooked. Transmission Digest describes plow-truck 4L80E units arriving with anything plastic melted and every bushing discolored from heat. A master kit replaces the friction elements, pistons and every seal and gasket in one go, so once the hard parts check out, the rebuilt unit starts with fresh clamping force in every clutch pack and a full set of seals holding pressure.
Before buying a full kit, rule out the cheap faults. Pull codes and check the solenoids and case connector, since a failed solenoid or bad feed can mimic a slipping clutch; our 4L80E common problems guide covers how to separate electrical faults from mechanical ones. A line pressure test tells you whether the unit can still make pressure. If the fluid is burnt and full of debris, or the unit slips with good pressure and good solenoids, the clutches are worn and an overhaul is the fix. Our 4L80E rebuild cost guide breaks down what a rebuild runs and when it makes sense against a replacement unit.
This kit is listed for the 4L80E without a narrower year range. GM built the 4L80E from 1991 to 2009 and revised it along the way, including the pressure control solenoid change after 1993 and the revised internal harness and solenoids from 2004, and some internal parts differ between early and late units. Before ordering, send us the year, the VIN, and the transmission identification tag on the case so we can confirm the kit matches your unit. If you need a kit specific to a year range, our 4L80E parts collection lists year-specific options such as the 1997-2011 master kit.
A master kit covers the soft parts, so inspect and measure the hard parts as you go. Check every bushing and replace worn ones; a 4L80E bushing driver kit makes that job far easier. Look closely at the overdrive roller clutch and the intermediate sprag: Transmission Digest notes that the overdrive roller clutch holds by itself in first through third in drive and can fail when its plastic cage melts from heat. A worn intermediate sprag can be replaced with the 34-element heavy-duty sprag. Soak the new frictions in clean ATF before assembly, check clutch clearances against spec, and air-check every circuit before the valve body goes on. Vacuum testing the valve body, as Sonnax recommends, helps find worn bores that would undo the rebuild. Flush or replace the cooler and lines, install a new converter, fill with Dexron VI, and recheck the level hot.
| Fits | 4L80E |
| Part type | Master Rebuild Kit |
| 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.
The photo shows Raybestos frictions, a band, molded pistons, the gasket set and the sealing rings and O-rings. If you need to confirm a specific part such as steels or a filter, contact us before ordering.
It is listed for the 4L80E without a narrower range, and the unit changed between 1991 and 2009. Send us your year, VIN and case tag so we can confirm before you buy.
Worn bushings, the overdrive roller clutch and intermediate sprag if they show wear, the filter, and the torque converter. Flush the cooler and lines so old debris does not return.
It is built around Raybestos friction material. If you are working to a tighter budget, the year-specific kits in our 4L80E collection are lower-priced alternatives.
Dexron VI ATF, which is back-serviceable for the Dexron III the earlier units used. Soak new frictions in ATF before assembly.
