Full 1997-2003 4L60E overhaul set: frictions, steels, three bonded pistons, flex band, pump bushing, filter, gaskets and seals.
When a 1997-2003 Silverado, Tahoe, Suburban, S10, Blazer, Astro or Trailblazer starts slipping into 3rd and 4th, flares on the 1-2 shift, or leaves dark, gritty fluid and clutch material in the pan, the 4L60E is asking for an overhaul. This kit is aimed at the builder who wants to do it once: it carries the overhaul gasket and seal set, a full set of friction plates, the matching steel plates, three bonded pistons, a 2-4 flex band, the pump bushing and a deep-pan filter. The pistons and bushing are what set it apart from a frictions-and-seals kit.
The 4L60E makes its four ratios by holding or driving parts of two planetary gear sets with clutch packs and one band. Each clutch pack is applied by a piston that relies on a rubber sealing lip to hold oil pressure. On a high-mileage unit those lips harden and shrink with heat, so even fresh frictions will not clamp hard enough and the pack slips again. A bonded piston has the seal molded onto it, which removes that weak point instead of hoping the old piston survives another 100,000 miles. The flex band handles 2nd and 4th by wrapping the reverse input drum; a flex band conforms to a drum that is slightly out of round better than a rigid band does. The pump bushing supports the converter hub at the front of the case, and a worn one lets the hub wobble, which chews up the new front seal and causes the classic fresh-rebuild front leak.
Start with the fluid and the pan. Clutch lining and a layer of fine debris on the magnet usually mean a pack has already burned. Drive it with a scan tool and compare commanded gear to actual input and output speed: slip that shows up only in 3rd and 4th points to the 3-4 pack, slip in 2nd and 4th points to the band. Rule out electrical and hydraulic causes first, because a weak EPC solenoid or a worn valve body can mimic worn clutches. Our 4L60E common problems guide walks through separating these, and the 2-4 band and servo guide covers band wear and apply pin selection.
This kit is listed for the 1997-2003 4L60E and the 4L65E in that same window: Chevrolet Astro, Blazer, S10, Camaro, Express 1500, Silverado 1500, Suburban 1500, Tahoe, Trailblazer and Trailblazer EXT; GMC Jimmy, Sonoma, Safari, Savana 1500, Sierra 1500, Envoy and Envoy XL; Cadillac Escalade, Escalade EXT and Escalade ESV; and the Pontiac Firebird. The 1997-up case uses the bonded 3-4 piston and the later sun shell, so do not drop this kit into a 1993-1996 unit without checking the piston and shell first. Production changes happened inside this range too, so read the transmission ID tag on the case, compare your old parts on the bench, or send us your year and VIN before ordering. Every other part we carry for this unit is on the 4L60E collection page.
Hard parts are not included. Inspect the sun shell splines, drum bushings and planets while the case is empty, because a stripped sun shell will leave you with no 3rd or 4th no matter how good the clutches are. The 4L60E bench tools guide lists what you need on the bench before you start.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Not without checking. The kit is built for the 1997-2003 unit, which uses the bonded 3-4 piston and the later sun shell. A 1993-1996 transmission can differ in those parts, so compare your old piston and shell or send us the year and VIN first.
The clutch piston seals harden with heat and mileage. If they leak, the pack never gets full apply pressure and new frictions slip and burn. Bonded pistons have the seal molded on, so you replace that wear point instead of reusing it.
Inspect the sun shell, drums, bushings and planetary gears, which are not in the kit. Most builders also service or replace the torque converter, flush the cooler, and check the valve body for bore wear.
Use Dexron VI ATF. It is the current GM fill for the 4L60E and is backward compatible with the earlier Dexron III spec these trucks were built with.
Clear any stored codes and reset the shift adapts with a scan tool if yours supports it, then drive it through gentle full shifts while the computer relearns. Shifts can feel firm or soft for the first drives until it settles.
