Alto 057961 Red Eagle 2-5/8 in wide 2-4 intermediate band for 4L60E, 4L65E, 4L70E and 700R4 rebuilds that keep burning or slipping 2nd and 4th.
If your 4L60E rebuild keeps coming back with a flare on the 1-2 shift, RPM that creeps up in overdrive when you tow up a hill, or a pan full of black band material, the stock narrow 2-4 band is often the weak link. This is the Alto 057961 PowerBand, a wide 2-5/8 inch (2.625 in) intermediate band lined with Red Eagle friction, for the 700R4, 4L60, 4L60E, 4L65E and 4L70E used in Silverado and Sierra 1500 pickups, Tahoe, Suburban, Yukon, S10, Blazer, Camaro and Corvette.
The band wraps the outside of the reverse input housing. When the 2-4 servo strokes, the band squeezes that drum and stops the reaction sun gear, and that held sun is what makes both 2nd gear and overdrive. On the 2-3 shift the servo has to release the band while the 3-4 clutch takes the load, then apply it again for 4th. So the band works twice in every full upshift cycle and slips a little every time it picks up. Heat is what kills it. A truck that tows, carries a bigger engine, or runs low line pressure glazes the lining until the band cannot hold.
Going from the narrow factory width to 2-5/8 inch puts more lining on the drum, which spreads the clamp load and the heat over more surface. Red Eagle is a dual-saturated paper friction made for high heat and torque, which is why builders reach for it on towing, performance and heavy-duty rebuilds rather than for a stock grocery-getter.
Make sure the electrical side is commanding gears normally first. Transmission Digest points out that a 4L60E missing both 2nd and 4th, with 1st, 3rd and reverse working, aims at the 2-4 band or the sun shell, since both gears depend on holding the sun gear. A stripped sun shell also takes out reverse and needs a new shell rather than a band. Our Camaro shift problems guide walks through the solenoid checks, and the 4L60E common problems guide covers the sun shell and 3-4 failures that look like band slip.
Alto lists the 057961 for the TH700-R4 / 700R4, 4L60, 4L60E, 4L65E and 4L70E. It is one band, about 1 lb. Confirm the transmission, not just the vehicle: some trucks of the same year left the factory with a different unit, so read the tag on the case or send us your year and VIN. More parts for this unit are on the 4L60E parts page.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Yes, it fits the 4L60E case. The reverse input drum must have a flat, clean band surface across the full 2-5/8 inch width, so inspect it or replace it.
Alto lists 057961 for the 700R4, 4L60, 4L60E, 4L65E and 4L70E. Check the tag on your transmission to confirm the unit.
Look hard at the reverse input drum and the 2-4 servo and apply pin. A full rebuild should also cover the 3-4 clutch pack, since it shares the 2-3 and 3-4 shifts with the band.
No. A stripped sun shell also drops 2nd and 4th, and it takes reverse with it. If reverse is gone too, check the sun shell first.
Yes. Soak it in fresh ATF before assembly so the lining is wet on first apply, then fill with Dexron VI.
