4L65E Input Drum 1987, remanufactured and ready to install. Fits the 4L65E. Ships fast from the USA.
If your 4L65E-equipped Silverado, Sierra, Tahoe or Yukon slips on the 1-2 shift, flares into overdrive on a grade, or backs up slowly while every forward gear still pulls, the reverse input drum deserves a hard look during the rebuild. This remanufactured drum carries GM reference 24245624 and is listed for 1987, which tells you something useful: it is the long-running reverse input housing design that the 700-R4 and 4L60 started with, sold here for 4L65E rebuilds. It ships with a 1-year warranty.
The part pictured is the reverse input housing, the drum that sits right behind the pump. It has two jobs. Its smooth outer shell is the friction surface for the 2-4 band; when the servo clamps the band in 2nd and 4th, the drum stops, and because the slotted tabs on its open end lock into the reaction sun shell, the sun gear stops with it. Inside, the drum holds the reverse input clutch pack and its piston, which drive that same sun shell when you select Reverse. In a 4L65E behind a 6.0L towing a trailer, the band surface sees a lot of heat, so a drum that has been glazed or dished by a slipping band will chew up a new band quickly.
Low fluid, a weak servo and low line pressure can all imitate a bad drum, so check those first. With the transmission apart, clean the drum and check the band surface with a straightedge and good light. Sonnax recommends a new drum whenever a wider intermediate band is installed, because a used drum is often no longer true where the old band rode. Air-check the reverse input piston for a firm apply that holds, and inspect the tabs and the bushing bore. Slipping in 3rd and 4th points instead to the separate 3-4 clutch in the input housing, which our 4L65E 3-4 clutch failure guide covers. For the full picture of what wears out together in this unit, read the 4L65E common problems guide.
Be clear on the dates: the 4L65E itself arrived in 2001 trucks, and in 1987 this transmission family was still the 700-R4. The 1987 in this listing reflects the reverse input housing design the part is tied to, and GM reference 24245624 is the number to compare against your old drum. Because the 4L60 family saw running changes in bushings and drum details over the years, match the tab count, the band surface width and the bushing size against the photo, or send us your year and VIN to confirm. If you prefer a listing written across the full span, see our 1987-2014 input drum, and the 4L65E parts collection lists every other hard part we carry for this unit.
An overhaul kit supplies the clutches and seals for this job, and a 4L65E sun shell is worth replacing if its tabs are worn where they meet this drum.
| Fits | 4L65E 1987 |
| Part type | Input Drum |
| Condition | Remanufactured |
| Brand | GM |
| Reference | 24245624 |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. The 4L65E went into 2001-2007 GM trucks and SUVs. In 1987 the family was the 700-R4. This drum is listed for 1987 because it carries the reverse input housing design and GM reference 24245624 used across the family, so compare it with your old part before installing.
It is the reverse input housing, the drum behind the pump that the 2-4 band wraps around. It is different from the input housing that holds the forward, overrun and 3-4 clutches.
Plan on a new 2-4 band, reverse input clutches, piston seals and the pump hub sealing rings. Inspect the sun shell tabs where this drum engages them.
Dexron VI. Soak new friction plates and the band in it before assembly, and check the level hot after the rebuild.
Look for a blued or scored band surface, a dish across the surface when checked with a straightedge, cracked tabs, or a reverse piston that will not hold air. Any of those is a reason to replace it.
