4L60E Master Rebuild Kit with Frictions and Steels

If your Silverado, Sierra, Tahoe, Suburban, Express, Trailblazer, S10 or Camaro has a 4L60E that slips into third and fourth, has lost reverse, or showed a pan full of black clutch material, this is the kit for the teardown. It crosses to the T74960K, T05700B, RK4L60E and W74008GAP kit numbers, covers the 1993-up 4L60E plus the later 4L65E and 4L70E, and puts the full gasket and seal set together with a complete set of friction and steel plates in one 9 lb box.

What a master rebuild kit does in a 4L60E

The 4L60E is a four-speed rear-drive unit that gets each gear from a combination of clutch packs and a band: forward clutch and sprag for drive, the 3-4 pack for third and fourth, the 2-4 band for second and overdrive, the overrun clutch for engine braking, and the low/reverse pack. Every one of those packs is fed by oil that has to pass sealing rings and lip seals on the way. When a pack burns, the debris travels through the whole unit, so a single-pack repair rarely lasts. This kit renews the friction and steel stack in every pack and every seal that holds apply pressure, which is the only way to start the rebuilt unit with known clearances everywhere.

Symptoms that point to a full overhaul

• Slipping or flaring on the 2-3 or 3-4 shift, usually the 3-4 pack giving up first under load or behind a modified engine
• No third or fourth gear at all, which is often stripped sun shell splines rather than worn clutches, so inspect the shell before blaming the kit parts
• No reverse or a long delay into reverse
• Burnt-smelling fluid with friction material and steel glitter in the pan
• Leaks from several places at once on a high-mileage unit

Codes like P0741 (converter clutch) or P0748 (pressure control solenoid) are usually valve body and solenoid problems, not clutch problems. A kit will not cure those on its own.

How to confirm before you buy

Check fluid level and condition, scan for codes, and drive it hot. If the truck slips in a gear with a correct fluid level and the pan shows clutch debris, the unit needs to come apart. Our 4L60E common problems guide walks through separating clutch failures from solenoid and valve body faults, and the bench rebuild tools guide lists the compressors and gauges you will want on the bench before you start.

Fitment

The listing covers 1993-up rear-drive GM: 1993-2000 C/K 1500, 1999-2013 Silverado and Sierra 1500, 1995-2010 Tahoe, 1995-2009 Yukon and Yukon XL 1500, 1993-2008 Suburban 1500, 2002-2008 Avalanche, 1996-2014 Express and Savana, 2002-2009 Trailblazer and Envoy, 2004-2012 Colorado and Canyon, 1993-2005 S10, Blazer, Sonoma, Jimmy, Astro and Safari, 1994-2002 Camaro, 1994-2005 Corvette, 1999-2006 Escalade and 2003-2007 Rainier. GM revised this transmission many times over twenty years, so a kit that spans 1993-up can leave you with spare gaskets for a revision you do not have. Match the old gaskets and plates against the new ones before assembly, and if you are unsure, send us your year and VIN and we will confirm it. You can also compare dated kits on the 4L60E parts page, such as the 1993-1996 master kit.

Install notes

• Soak every new friction in clean ATF before stacking it, and use Dexron VI for the refill.
• Measure clearance on each pack as the drum goes together rather than trusting the stack height.
• Replace every piston seal and sealing ring in the box; reusing old rings is the common reason a fresh rebuild slips again.
• Drums, the sun shell, bushings and the sprags are hard parts and are not in this kit. Inspect them during teardown and price a forward and low/reverse sprag set if either sprag freewheels both ways.
• Set gear train end play during assembly. GM lists 0.005-0.036 in, and Sonnax recommends building toward the tighter middle of that range.
• A clutch spring compressor and Teflon seal tool set makes the sealing rings much easier to size and install without cutting them.

Does this kit fit a 4L65E or 4L70E?

The listing covers the 4L60E, 4L65E and 4L70E. Those later units share the basic layout but differ in some pistons and pack counts, so compare the plates and gaskets to your old parts before assembly, or send us your year and VIN.

Which kit numbers does this cross to?

It crosses to T05700B, T74960K, RK4L60E and W74008GAP.

Are drums, bushings or the sun shell included?

No. This kit is the gasket and seal set plus friction and steel plates. Drums, the sun shell, bushings and other hard parts need to be inspected and bought separately if they are worn.

What fluid should I use after the rebuild?

Use Dexron VI ATF. Soak the new frictions in ATF before assembly and fill to the correct hot level after the first drive.

Will this kit fix a P0741 code?

Usually not by itself. P0741 on a 4L60E is most often valve body bore wear or a converter clutch problem, so check the valve body and TCC circuit during the rebuild.

• 4L60E Common Problems, Symptoms, and What to Actually Do About Them
• 4L60E Rebuild: The Bench Tools You Actually Need
• 4L60E 2-4 Band and Servo: Wear, Pin Selection and the Corvette Servo Upgrade
• 4L60E Valve Body Rebuild: A Bench Walkthrough