4R70W Input Drum 1992, remanufactured and ready to install. Fits the 4R70W. Ships fast from the USA.
Lost Drive in an early Ford rear-wheel-drive automatic, or opened the case and found a cracked forward drum and burnt frictions? This remanufactured 4R70W input drum is the early-style forward clutch drum on its input shaft, listed under 1992. Before you order, read the fitment section below, because the 1992 date matters: it sits right at the point where Ford's AODE gave way to the 4R70W.
The input drum is the forward clutch drum. The input shaft carries turbine torque into it, and when its piston squeezes the forward clutch pack the drum drives the forward sun gear. That clutch is applied in first, second and third in Drive and released in fourth and Reverse. It is the busiest clutch in the transmission during stop-and-go driving, and it is the one that has to absorb every hard launch.
Sonnax calls forward clutch drum breakage a chronic issue across the AOD, AODE and 4R70W series, and lists no forward, slipping gears, a broken drum and ratio codes as the problems a stronger drum is meant to cure. On a high-mileage early unit you will often find the original drum cracked around the apply area or the splines worn.
Low line pressure kills forward clutches. Sonnax ties low base line pressure to soft shifts, delayed Forward engagement and forward and direct clutch failure on this family, so verify pressure before you blame the drum. If the pressure problem traces to the main regulator circuit in the valve body, the Sonnax 76948-02K boost valve and sleeve kit is one of the repair parts made for AODE and 4R70W valve bodies. Our 4R70W Crown Victoria shift problems guide walks through the pressure and solenoid checks, and the 4R70W F150 common problems guide covers the truck side. If the drum checks out but the pack is burnt, the root cause is upstream and a new drum alone will not save the next clutch pack.
The 4R70W family runs from 1993 to 2008 in the F-150, Expedition, Mustang, Crown Victoria, Grand Marquis, Town Car and Navigator. Ford's 1992 rear-drive cars used the AODE, the 4R70W's predecessor, which shares the basic layout but uses a different planetary ratio. Sonnax sells separate drum kits for the AODE (2.40/1.46 ratio) and the 4R70W (2.84/1.55 ratio), so do not assume a 1992 vehicle takes a 4R70W part without checking. This drum is the early style with a single forward clutch apply hole, which ATRA identifies as the pre-2004 design. Match the shaft length, spline count and apply-hole pattern against your old drum, read the identification tag on your transmission case, or send us your year and VIN and we will confirm before it ships. If your unit turns out to be an AODE, the 1992 AODE clutch drum is the place to start. Every early and late part is on the 4R70W/4R75W collection page.
| Fits | 4R70W 1992 |
| Part type | Input Drum |
| Condition | Remanufactured |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Ford's 1992 rear-drive cars used the AODE. The 4R70W family runs from 1993 to 2008. The two look alike but use different planetary ratios, so read the identification tag on the case or send us your year and VIN before ordering.
Yes. In this transmission family the input drum is the forward clutch drum on the input shaft. It drives the forward sun gear in first through third gear.
ATRA notes the only drum change in 2004 was three apply holes instead of one and calls it cosmetic for apply. But 2004 also changed the ring gear and output speed sensor, which do not interchange, so keep the rest of the geartrain matched to its year.
Low line pressure is the usual reason, from EPC problems or a worn pressure regulator valve bore. A cracked drum or leaking piston seal does it too. Find and fix the pressure problem before installing a new drum and clutch pack.
A full set of forward clutch frictions, steels, piston seals and sealing rings. If metal was in the pan, also inspect the forward sun gear and planetary and plan on flushing the cooler.
