4L65E Input Drum 1982, remanufactured and ready to install. Fits the 4L65E. Ships fast from the USA.
A Silverado, Sierra, Tahoe or Yukon with a 4L65E that drops out of 2nd, flares as it grabs overdrive, or creeps into Reverse with a long delay often has the same part at the bottom of the problem: the reverse input drum. This remanufactured GM drum is listed for 1982, the year the 700-R4 went into production, and it is the plain bare-shell style pictured, with the machined band surface, the slotted drive tabs on the open end and the bronze bushing visible in the center bore. It comes with a 1-year warranty.
This drum sits directly behind the front pump and rides on the pump stator support. The outside of the shell is what the 2-4 band clamps. When the servo applies the band for 2nd and 4th gear, the drum is held still, and because its slotted tabs are locked into the sun shell, the sun gear is held with it. That reaction is what makes 2nd and overdrive. In Reverse the job flips: the reverse input clutch inside the drum applies, and the drum drives the sun shell instead of holding it. One part, three gears. On a 4L65E working behind a 5.3L or 6.0L with a trailer, the band surface takes repeated heat, and a drum that has been glazed, blued or slightly dished by a slipping band will ruin a new band in short order.
Do not condemn the drum on symptoms alone. Low fluid, a leaking servo, low line pressure and a worn pump can all produce a slipping 2nd and 4th. Sonnax documents a specific trap in this family: a leaking 3rd accumulator checkball capsule lowers both 3-4 clutch apply pressure and band release pressure, so the band and the 3-4 clutch can burn together. Vacuum-test that capsule during the rebuild. Once the unit is apart, clean the drum and look at the band surface under good light for scoring, heat color and wear steps, check the tabs for cracks at their roots, and feel for play between the bushing and the stator support. If 3rd and 4th were the gears slipping, read our 4L65E 3-4 clutch failure guide first, since that clutch lives in the separate input housing. For a broader look at what wears together, see 4L65E common problems and fixes.
Straight talk on the year: no 4L65E existed in 1982. That was the first year of the 700-R4, which became the 4L60, then the electronic 4L60E, and finally the heavy-duty 4L65E found in 2001-2007 GM V8 trucks and SUVs. The 1982 in this listing marks the reverse input drum design this part follows. The basic drum carried across the family, but GM made running changes to bushings and drum details over the decades, so compare tab count, band surface width, overall height and bushing size against your old drum or the photo before you install it. If you are unsure, send us your year and VIN and we will check it for you. You can also compare our 1987-2014 input drum listing, and the full 4L65E parts collection lists every hard part we stock for this unit.
| Fits | 4L65E 1982 |
| Part type | Input Drum |
| Condition | Remanufactured |
| Brand | GM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The 1982 date is the 700-R4 design year, not a vehicle limit. The reverse input drum design carried through the 4L60, 4L60E and 4L65E, but details changed along the way. Match tab count, band surface width and bushing size to your old drum, or send us your year and VIN to confirm before ordering.
This is the reverse input drum, the shell the 2-4 band wraps around, with drive tabs that lock into the sun shell. The input housing that rides on the turbine shaft and holds the forward, overrun and 3-4 clutches is a different part.
Yes. A used band has worn to the shape of the old drum surface and will not seat evenly on a fresh one. Replace the band, and inspect the servo and its seals at the same time.
Slipping or flaring in 2nd and 4th, slow or weak Reverse, a new band burning quickly, band material on the pan magnet, and cracked tabs or a loose bushing found when the unit is apart.
GM specifies Dexron VI for the 4L65E. Pre-soak the new frictions in it, and check the level hot after the first drive.
