BorgWarner frictions and steels, 2-4 band, bonded pistons, filter, bushings and a Transtec seal kit to rebuild a GM 4L60E, 4L65E or 4L70E in one box.
Searching for a 4L60E rebuild kit because your Silverado 1500, Sierra 1500, Tahoe, Suburban, Yukon, Camaro or Corvette is slipping on the 1-2 shift, dropping third, or leaving a pan full of dark fluid? This kit is aimed at the builder who wants the rebuild to come out tighter than the original. Instead of plain loose-seal pistons and a stock-width band, it pairs BorgWarner friction clutches and matching steels with bonded rubber pistons and a wide 2-4 band. The pump bushing, extension housing bushing, filter and a full Transtec gasket and seal set are in the same box, which comes in at about 13 lb.
Every shift in a 4L60E depends on a piston pushing a clutch pack or a servo pushing the 2-4 band onto its drum. The weak spots are the seals on those pistons and the holding power of the band. A conventional piston uses a separate lip seal that can roll or nick as it slides into the drum, and a cut lip leaks apply oil so the pack never clamps fully. A bonded piston has its rubber lip molded to the steel, so there is nothing loose to twist during assembly. The wide 2-4 band puts more lining on the drum, which gives more holding capacity in 2nd and 4th, the two gears the band is responsible for. BorgWarner frictions are an OE-grade material, and the included steels mean they bed in against fresh, flat plates rather than heat-marked old ones.
Rule out the cheap causes first. Harsh or soft shifts with a P0748 code can come from the pressure control solenoid alone, and a slipping torque converter clutch often traces to valve body wear rather than the clutch packs. Our 4L60E common problems guide covers those, and the 2-4 band and servo guide explains how band wear and servo pin length show up on the road. If the fluid is burnt and the unit slips in more than one gear, a full rebuild with this kit is the right repair.
Listed for GM 4L60E, 4L65E and 4L70E transmissions, found in the Silverado 1500 and Sierra 1500 (2WD and 4WD), Tahoe, Suburban, Yukon, Camaro, Corvette and Cadillac CTS. No year range is published for this kit, so treat fitment as something you verify on the bench: compare the pistons, pan gasket and valve body gaskets against your originals, and pay extra attention if you are building a later 4L65E or 4L70E. If you want a second opinion, send us the year and VIN before you order. The full lineup for this unit is on our 4L60E parts page.
| Transmission | GM 4L60E, 4L65E, 4L70E |
| Frictions | BorgWarner friction clutches with steel plates |
| Includes | Wide 2-4 band, bonded pistons, filter, pump bushing, extension housing bushing, Transtec gasket and seal kit |
| Manufacturer part number | SZFHF-QMP-GN02483 |
| Kit weight | 13.3 lb |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The rubber lip is molded to the piston, so there is no separate seal to roll or cut as you press it into the drum. A damaged lip seal is a common reason a fresh rebuild slips right away.
Sonnax advises against it. The old narrow band wears a dish into the drum, and a wide band on that surface slips and glazes in 2nd. Plan on a new or unworn drum.
It is listed for the 4L60E, 4L65E and 4L70E. No year range is given, so compare pistons and gaskets with your parts during teardown and send us your VIN if you are unsure.
The front pump bushing and the extension housing bushing are included. Inspect the drum and case bushings separately while the unit is apart.
Soak the frictions in ATF for about 30 minutes before assembly and fill with Dexron VI. Clear adaptive shift values with a scan tool after installation so the computer relearns shift timing.
