700R4 Input Drum, new and ready to install. Fits the 700R4. Ships fast from the USA.
A 700R4 that has lost Reverse, or one that keeps cooking its 2-4 band, very often has a damaged reverse input drum at the center of it. This is a brand new replacement drum, not a cleaned-up core. It is the late design made from 1987 on, with no check ball and a large feed hole, and it carries the same reference as GM 24245624. The same drum fits the 4L60, 4L60E, 4L65E and 4L70E, so it suits a stock 1987-1992 Chevy C/K, Blazer, Suburban, Camaro or Caprice rebuild as well as an LS swap running a later 4L60E.
Most people call this part the band drum, and that is half of its job. The 2-4 band wraps around its outer surface, and when the servo applies the band in 2nd and 4th gear the drum is held stationary. Inside the drum is the reverse input clutch pack. In Reverse that clutch locks the drum to the input so it can drive the sun shell. Because it serves both the band and a clutch, a single bad drum can show up as a Reverse problem, a 1-2 flare, or slipping in overdrive. This drum comes with bushings already pressed in, which matters because a worn drum bushing lets the whole housing wobble on the stator shaft and chew up its sealing rings.
The 700R4 is hydraulically controlled, so none of this sets a trouble code. The model's best-known failures, 3-4 clutch burnout from a misadjusted TV cable and the cracked sun shell, can look a lot like a drum failure; the 700R4 common problems guide walks through telling them apart.
Look at fluid condition, then gauge line pressure in Drive and Reverse. A TV cable set too short drops line pressure and slowly kills every friction element in the box, so read 700R4 TV cable adjustment and line pressure before replacing anything. With the unit apart, the drum tells its own story: spin it on the stator shaft and feel for bushing play, look for cracks at the clutch tangs and at the base of the band surface, and check the band contact area for a step or heat discoloration.
This drum fits 1987-and-later 700R4/4L60 units and the 4L60E, 4L65E and 4L70E that followed. GM changed the reverse input drum during 1987, and the early 1982 to early-1987 drum is a different design, so this is not a blind swap into an early transmission. Compare the feed hole between the sealing ring lands, the piston style and the bushings with your old drum, or send us your year and VIN and we will confirm it before it ships. Browse every part for this unit on the 700R4 transmission page.
| Fits | 700R4 |
| Part type | Input Drum |
| Condition | New |
| 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.
It is a brand new reverse input drum with bushings already installed. It comes bare, so the piston, clutch plates and snap rings come from your rebuild kit.
Not as a direct swap. This is the late design used from 1987 on. Early 1982 to early-1987 drums are built differently, so compare it with your old drum or send your year and VIN first.
Yes. The same drum is used in 1987-up 700R4/4L60 units and in the 4L60E, 4L65E and 4L70E.
A new 2-4 band, new reverse input frictions and seals, and the drum sealing rings. Check the sun shell and stator shaft bushings at the same time.
Dexron-type ATF. A current Dexron-VI fill is backward compatible with the original Dexron-II spec.
