4L70E Input Drum 1982, remanufactured and ready to install. Fits the 4L70E. Ships fast from the USA.
Looking for a reverse input drum for an early GM overdrive automatic, or a lower-cost housing for a 4L70E overhaul? This remanufactured drum is listed for 1982, the first model year of the 700-R4 that the whole 4L60, 4L60E, 4L65E and 4L70E line grew out of. If your teardown turned up a heat-checked band surface, a cracked drum or a reverse piston that will not hold air, this is the housing that replaces it. It is sold as a GM part, ships from the USA and is covered by a 1-year warranty.
A 1982 Camaro, Corvette, C10 or Caprice with an overdrive automatic had a 700-R4, not a 4L70E. GM applied the 4L70E name to its heavy-duty version of the same design in 2006-2013 trucks, SUVs and the Trailblazer SS. The reverse input housing is one of the hard parts the generations share, and GM's current service housing, 24245624, replaces several earlier numbers for exactly that reason. Before you mix parts from different years, read our guide to what interchanges between the 4L60E, 4L65E and 4L70E, and for the power and strength differences between the last two, the 4L65E vs 4L70E comparison.
The housing works in two directions at once. Its outside diameter is a machined band track: the 2-4 servo pushes the band tight around it, which holds the drum still, and the slotted tabs at its open end lock the reaction sun shell so the planetary set gives 2nd and 4th. Inside, a piston and the reverse input clutch pack connect the drum to the input when you select Reverse. The listing photo shows the bare housing from the closed side, with the band track, the bushing in the hub and the tabbed rim. No clutch pack is shown, so plan to fit reverse input frictions and steels from your rebuild kit.
On an older unit, start with the fluid, the band adjustment and line pressure. Many slips blamed on hard parts come from a worn pump, a weak servo or a valve body problem, and our valve body testing guide and pump failure guide walk through those checks. With the drum on the bench, clean it and check the band track with a straightedge. Sonnax notes that an old band compresses the drum into a subtle dish, and that a new drum is strongly recommended when fitting a new or wider band. Air-check the reverse piston and look for any leak-down.
This listing is for 1982. Over the following decades GM changed bushings, part numbers and surrounding hard parts, so do not assume an early-pattern housing matches a late unit in every detail. Put your old drum next to the photo and compare the tab count and spacing, the bushing bore and the overall height, or send us the year, model and VIN and we will confirm before it ships. Owners of later 4L70E units may prefer the input drum listed for 1987-2014. Browse the full 4L70E collection for matching parts.
| Fits | 4L70E 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.
It is listed for 1982, the first 700-R4 year. Because GM made running changes over the life of the family, compare tab count, bushing size and height with your old drum, or send us your year and VIN to confirm.
The 4L70E is a later heavy-duty member of the same family, and the reverse input housing is shared across generations. GM's current service housing replaces several earlier numbers.
The listing photo shows the bare housing with no clutch pack, so plan to supply reverse input frictions and steels from a rebuild kit.
A new 2-4 band, reverse input piston seals, and the frictions and steels for the reverse pack. A master rebuild kit covers most of these.
Dexron VI ATF. GM lists it as the replacement for the earlier Dexron fluids these transmissions originally used.
