6L90 Master Rebuild Kit, new and ready to install. Fits the 6L90. Ships fast from the USA.
When a 6L90 in a Silverado or Sierra 2500HD/3500HD, an Express or Savana van, or a 2500-series Suburban starts slipping under a trailer, smells burnt, or drops a pan full of friction dust, you are looking at a full overhaul. This new master rebuild kit is catalogued for the 2006-up GM six-speed family (6L80 and 6L90) and contains three things: a complete overhaul kit (gaskets, metal-clad seals, O-rings and seals), a friction plate set, and a new filter. Steel plates and hard parts are not included, so plan to measure and reuse your steels or source them separately.
The 6L90 is a clutch-to-clutch six-speed. Five clutch packs (1-2-3-4, 3-5-Reverse, 4-5-6, 2-6 and Low-Reverse) are applied and released by pressure control solenoids, and every shift depends on each piston sealing tight and each friction holding its coefficient. Heat from towing hardens the rubber and glazes the friction lining at the same time, which is why a 6L90 that slips in one gear usually has tired seals everywhere else too. A master kit lets you reseal the case, pump, stator support, drums and pistons and re-line every pack in one teardown instead of paying for the labor twice.
Pull the pan first. A clean pan with a slip complaint points to the valve body, a stuck pressure regulator or a cracked clutch drum rather than worn-out frictions. Put a gauge on the line pressure tap; GM's P0741 bulletin ties converter debris to a scored pump, low line pressure and burnt clutches, with the 4-5-6 pack usually taking the damage. Our 6L90 rebuild wear points guide lists what to inspect once it is apart, and the 6L90 pump failure guide explains how to tell a pump problem from a clutch problem.
This kit is listed for 2006 and later 6L80 and 6L90 six-speed automatics. The 6L90 is the heavy-duty version found behind the 6.0L in 2007-up Silverado and Sierra HD pickups, Express and Savana vans, 2500-series Suburban and Yukon XL, and in the Cadillac CTS-V and automatic Camaro ZL1. Transmission Digest notes that about a quarter of the 6L90's internal parts were upgraded over the 6L80 for torque capacity, and ATSG lists fifteen components with different dimensions. Before you assemble, count the frictions in each pack you pulled and match them to the kit, and confirm the RPO code MYD on the glovebox or door label. If you want a kit listed only for 2007-up 6L90 units, see the 2007-up 6L90 master kit, or send us your year and VIN. All parts for this unit are on the 6L90 parts page.
| Fits | 6L90 |
| Part type | Master 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 kit with gaskets, metal-clad seals, O-rings and seals, a friction plate set, and a new filter. Steel plates, bushings, drums and the torque converter are not included.
It is catalogued for the 2006-up 6L80 and 6L90 family. The two units differ in some internal parts, so count the frictions you remove from each pack and match them to the kit before assembly. Send us your year and VIN if you are unsure which unit you have.
If the old unit had a P0741 code, shudder, or friction debris in the pan, yes. Converter clutch material circulates through the pump and valve body, and GM's own bulletin calls for converter replacement and a cooler flush in that case.
Dexron VI. GM lists 6.0 quarts as the 6L90 fluid change capacity; a dry rebuilt unit takes more, so fill, start the engine and set the level hot through the check plug.
Yes. New frictions change clutch fill times, so clear the transmission adaptive values with a scan tool and run the adaptive learn drive cycle before towing.
