4L80E / 4L85E Master Rebuild Kit with Raybestos Frictions (1997-2011)

The 4L80E and its heavier 4L85E brother are the big GM four-speeds that sit behind the 5.7, 6.0, 8.1, and Duramax in 2500 and 3500 trucks, vans, and Suburbans, so any shop that touches heavy GM work pulls these apart regularly. When one comes in slipping, burning fluid, or dropping out of overdrive, the wear items are the same every time: the frictions are cooked, the rubber is hard, and the rear band is glazed. This master kit carries all of that in one box so you are not chasing part numbers at the counter.

It pairs a premium overhaul set with a Raybestos friction module and a matching steel module, so you are rebuilding the clutch packs with a name transmission builders trust to take heat and hold, not a bargain friction of unknown origin. The overhaul side covers the gaskets, seals, o-rings, lip seals, sealing rings, check balls, and the small vital parts that always seem to be the one thing missing at the end of the job. A new-design rear band with smooth lining (part 38014BW) and a fresh filter round it out.

Coverage is 1997 through 2011 4L80E and 4L85E units (MT1 and M8), the run found in the C/K and GMT800 and GMT900 trucks, Express and Savana vans, Hummer H1, and Workhorse chassis. Manufacturer part reference W34006EA, B34024E, and A34010EA. Lay the case out clean, reuse your good hard parts, and this kit carries every wear item and both clutch modules you need to close it back up right. Ships from the USA.