4L60E Input Drum 1987, remanufactured and ready to install. Fits the 4L60E. Ships fast from the USA.
A 1987 GM truck, Camaro, Corvette or car with the four-speed overdrive automatic that slips into 2nd, lets go in overdrive on the highway, or has a weak Reverse often has a worn reverse input drum behind the pump. In 1987 that transmission was still badged the 700-R4; the electronic 4L60E came later, but the reverse input drum carries forward through the family. This remanufactured drum carries GM reference 24245624 and ships with a 1-year warranty, so a rebuild of an older unit can start with a cleaned, inspected housing instead of a heat-damaged original.
Shops call this part the input drum, the reverse drum or the reverse input housing, and it does two separate jobs. On the outside, its smooth outer surface is what the 2-4 band wraps around. When the servo applies the band, the drum is held still, and because the drum is splined to the reaction sun shell, that stops the sun gear and produces 2nd and 4th gear. On the inside, the drum contains the reverse input clutch and its piston, which drive the same sun shell when you select Reverse. A worn band surface therefore shows up in the forward gears, while a leaking piston or cracked housing shows up in Reverse.
Rule out the easy causes first: low fluid, an out-of-adjustment band or worn servo, and low line pressure will all slip a healthy drum. No Reverse can also come from the low-reverse clutch or a stripped reaction shell, which our 4L60E low-reverse clutch guide helps separate. With the unit apart, clean the drum and lay a straightedge across the band surface. Sonnax warns that an old band compresses the drum and leaves a subtle dish on its surface, and that a wider band should never be installed on a used drum for exactly that reason. Air-check the reverse input piston for a firm apply and no leak-down, and look closely at the lugs and spline area for cracks. For the other parts that usually wear at the same mileage, see our 4L60E common problems guide.
This listing is for 1987 applications, and GM reference 24245624 is the reverse input housing used across the 700-R4, 4L60 and 4L60E family. The family went through many running changes between the late-1980s 700-R4 and the last 4L60E units, so a 1987 owner should still compare the old drum's bushing, spline count and overall height with the listing photos, or send us the year, vehicle and transmission code or VIN so we can confirm. Related parts for older and later units are on our 4L60E parts page.
| Fits | 4L60E 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.
GM reference 24245624 is the reverse input housing for the 700-R4, 4L60 and 4L60E family, and this listing is for 1987 applications. Compare it to your old drum or send us your year and VIN to confirm.
No. This is the reverse input drum, the one the 2-4 band wraps around. The input housing that holds the forward, overrun and 3-4 clutches is a separate part.
It is not recommended. A used band has worn to the old drum's surface and will not seat properly on a fresh one, which can cause slipping in 2nd and 4th.
Heat from a slipping band, low line pressure, a worn servo or incorrect band apply pin length. Fix the cause during the rebuild or the new drum will wear the same way.
Dexron VI ATF. GM lists it as the replacement for the earlier Dexron fluids specified for these transmissions.
