4L70E Master Rebuild Kit 2004, new and ready to install. Fits the 4L70E. Ships fast from the USA.
If you own a 2004 Silverado, Sierra, Tahoe, Yukon, Suburban, Avalanche or Escalade and the transmission now slips, flares into third, smells burnt on the dipstick or takes its time grabbing Drive, this is the complete overhaul kit for the 4L60E family from the 2004 model year forward. It is catalogued for the 4L60E, the heavy-duty 4L65E and the later 4L70E, so it covers a 2004 truck today and the same kit fits if you ever swap in a newer core. Inside the box: a full set of Borg-Warner friction plates with matching steel plates, a Transtec soft parts set with every rubber seal and gasket for the job, a molded rubber piston kit, a new 2-4 band, a filter, a pump bushing and an extension housing bushing.
A 2004 GM truck or SUV did not leave the factory with a 4L70E. That name arrived for the 2006 model year, when GM rolled out the input speed sensor system on this family; ATRA's 2005 GM update spelled out that plan in advance. Your 2004 will carry either a 4L60E or, behind the 5.3L and 6.0L in heavier applications, a 4L65E. Both share the case, gear train layout and clutch pack sizes this kit is built around, which is why one 2004-up kit serves all three. Our interchange guide walks through what changed in each year so you can confirm what is under your truck.
Every gear in this unit comes from clamping a different combination of five clutch packs (overrun, forward, 3-4, reverse input and low/reverse) plus the 2-4 band around the reverse input drum. Each pack is a stack of lined frictions and plain steels squeezed by a rubber-sealed piston. After years of towing and high mileage, the frictions glaze, the steels heat-check and the piston lips harden, so pressure leaks past before the pack can lock. Replacing only one pack in that condition leaves the rest at the edge; a master kit renews every wear surface and every seal at once. The steel plates matter here. Low-cost kits leave them out, and reusing blued or warped steels against new frictions shortens the rebuild.
Pull the pan first. Heavy friction material and a darkened filter mean the packs are gone and this kit is the right call. A clean pan with a slip complaint points elsewhere, often line pressure, so read our pressure control solenoid guide before tearing the unit down. If the complaint is a 2-3 flare, the 3-4 clutch failure guide explains the 3rd accumulator checkball and input housing leaks that burn that pack; Sonnax names those oil leaks as the root cause of most burnt 3-4 clutches, and new frictions alone will not survive them.
This listing is for 2004-and-later 4L60E, 4L65E and 4L70E units in Chevrolet, GMC, Cadillac and Hummer applications. It is not intended for 1993-2003 units. Units were updated mid-year more than once, so match the ID tag on your case, or send us your year and VIN and we will confirm it before it ships. Browse everything we carry for this family on the 4L70E parts page.
| Fits | 4L70E 2004 |
| Part type | Master 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. The kit is catalogued for 2004-and-later 4L60E, 4L65E and 4L70E units. A 2004 truck has either a 4L60E or a 4L65E, since the 4L70E did not appear until 2006. Send your VIN if you want us to confirm before it ships.
Borg-Warner frictions and steel plates for every clutch pack, a Transtec seal and gasket set, a molded rubber piston kit, the 2-4 band, a filter, a pump bushing and an extension housing bushing.
No. This version is for 2004 and newer units. Earlier transmissions should use a kit catalogued for 1993-2003; ask us and we will point you to the right one.
Inspect the sun shell, input drum and its checkball, and the pump. Many rebuilders also add a shift kit and a new TCC solenoid at this stage, and the cooler should always be flushed.
Use DEXRON-VI. It replaced DEXRON-III in GM's service fill and is backward compatible with 2004 units. Soak the frictions in the same fluid before assembly.
Yes. Clear adaptive shift values with a scan tool after installation, then drive the truck through light-throttle upshifts so the computer can relearn shift timing on the new clutches.
