4L60E overhaul kit that adds clutch steels and pistons to the frictions, gaskets and seals, for 2004-up GM 4L60E, 4L65E, 4L70E and 4L75E.
If your 2004-or-newer Silverado 1500, Sierra 1500, Tahoe, Yukon or Suburban has started slipping on the upshifts, flaring into 3rd, or engaging late into Drive, and the fluid on the dipstick is dark, the 4L60E (or its 4L65E and 4L70E relatives) is due for an overhaul. This kit is built for that job on 2004-up units. It goes further than a friction kit by including the clutch steels and the pistons along with the frictions, gaskets, seals and O-rings, so every clutch pack goes back together from new parts.
In a 4L60E each clutch pack is applied by a piston that the valve body fills with line pressure. The piston seal holds that pressure, the steels carry the heat, and the frictions do the gripping. When a rebuild only replaces the frictions, the old pistons and steels stay in the unit. A cracked piston or a seal lip that has taken a set leaks apply pressure and slips a brand-new pack, and a steel that is slightly warped or glazed shortens the life of the new lining. Replacing all three together removes the guesswork: the 3-4, forward and overrun circuits, which are the ones most often blamed for a comeback, start from known-good pistons and flat steels. The listing covers 4L60E, 4L65E, 4L70E and 4L75E from 2004 on.
Two common 4L60E complaints are not clutch failures. Converter clutch slip with P0741 frequently comes from valve body bore wear, and harsh or soft shifts with P0748 usually trace to the pressure control solenoid. Our 4L60E common problems guide walks through separating them, and the valve body rebuild walkthrough covers vacuum testing the valve body. If the codes are clear and the slip is mechanical, an overhaul with new pistons and steels is the repair that holds up.
The kit is listed for 2004-up GM 4L60E, 4L65E, 4L70E and 4L75E transmissions, which covers late GMT800 and GMT900 trucks and SUVs through the end of 4L60E production. GM did revise parts during that run. A Transmission Digest article by the Sonnax TASC Force notes that GM changed the reaction carrier, its bearing and the output shaft in March 2007, and those pieces have to be matched as a set. That does not affect the contents of this kit, but it matters if you replace gear train parts on the same rebuild. Before the valve body goes on, confirm the gasket and separator plate pattern matches your 2004-up case. Read the ID tag on the case, and send us the year and VIN if you want us to double-check. Use the 4L60E collection to find hard parts for your unit, or compare the 2004-2010 master rebuild kit with filter.
| Type | Overhaul rebuild kit with steels and pistons |
| Fits | GM 4L60E, 4L65E, 4L70E, 4L75E (2004-up) |
| Includes | Frictions, steels, pistons, gaskets, seals, O-rings |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is listed for 2004-up 4L60E, 4L65E, 4L70E and 4L75E units, so a 2008 half-ton with one of those transmissions is in range. Read the ID tag on the case to confirm the model, and send us the year and VIN if you want us to check it.
Old pistons can crack and their seals take a set. Either one leaks apply pressure and makes new frictions slip. A kit with pistons and steels removes the two most common reasons a 4L60E rebuild comes back.
The listing covers frictions, steels, pistons, gaskets, seals and O-rings. Hard parts such as drums, the sun shell and bushings are not included, and a filter is not in the listed contents, so order those separately.
GM allows 0.005-0.036 in total end play. Transmission Digest articles from the Sonnax TASC Force recommend a tighter bench target of roughly 0.020-0.030 in for durability.
Use Dexron VI ATF. After the first drive, check the level at operating temperature with the engine idling in Park.
On these electronically controlled units, clearing the stored transmission adapts with a capable scan tool lets the computer learn the new clutches. Then drive gently through all gears for the first several trips.
