TH350 Input Drum 1969-86, remanufactured and ready to install. Fits the TH350. Ships fast from the USA.
A Turbo 350 that pulls through first and second and then flares or never finds third, or that rolls backward with no drive in Reverse, usually has a problem in the direct clutch. This listing is a complete, loaded direct clutch drum for the 1969-1986 TH350 and TH350C used in Chevrolet, GMC, Pontiac, Oldsmobile and Buick cars and light trucks. It is sold as an input drum, but it is the front drum that sits right behind the pump, and it comes built up as a 5-clutch pack: the drum, a 5-clutch piston kit, every steel and friction plate, and the intermediate overrun roller clutch (8 rollers) with its race. It is a pre-owned GM drum in excellent condition, so you start with a hard part that has not been cracked, blued or worn through at the bushing.
GM calls this the 2-3 clutch. Fluid from the pump hub passes three hook-type sealing rings into the drum, pushes the piston against the plates, and locks the drum to the sun gear and input so the gearset turns as one in third. The same clutch also applies in Reverse, which is why a leaking direct circuit takes out both third and Reverse. The drum hub doubles as the inner cam for the intermediate overrun roller clutch. That roller clutch, together with the intermediate clutch, holds second gear in Drive. A slipping or misassembled roller clutch gives the classic TH350 complaint of a 1-3 shift with no second.
The stock 350 ran four direct plates; the heavier-duty 375B version used five for more torque capacity. Because this drum is already set up with five clutches and a matching piston kit, it suits a rebuild that has to live behind more power or a tow load.
Check fluid level and modulator vacuum first, then put a pressure gauge on the case and compare Drive and Reverse readings. Normal pressure with no third and no Reverse points inside the unit: cut direct piston seals, broken pump hub rings, or burned plates. With the unit apart, air-check the direct circuit through the pump hub before condemning the drum. Our TH350 common problems and fixes guide walks through the no-second and no-Reverse diagnosis, and the delayed engagement guide covers the pressure checks that separate a pump problem from a clutch problem.
This drum is listed for the TH350 and TH350C from 1969 through 1986. The listing covers both the non-lockup and lockup versions, but check two things against the drum you remove: the thrust setup at the front (bearing or washer) and the style of intermediate roller clutch race. If you are building a unit for a specific vehicle and want us to double check, send the year and VIN or a photo of your old drum before ordering. Every other TH350 part we carry is on the TH350 parts page.
A drum does not fix worn seals elsewhere in the unit. Pair it with a TH350 master rebuild kit for gaskets, seals, bushings and a band, and add a TH350 shift kit if you want firmer 2-3 shifts that put less heat into the new direct pack.
| Fits | TH350 1969-86 |
| 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.
Many shops call the front drum of a TH350 the input drum because it is the first drum behind the pump. GM's service name is the direct clutch drum, or 2-3 clutch. The forward clutch housing with the input shaft is a different part.
Yes. It is listed as a loaded 5-clutch drum with the 5-clutch piston kit, all steels and frictions, and the 8-roller intermediate overrun roller clutch and race.
The 375B version of this transmission used five direct plates instead of four in the same case for more torque capacity. Set your clutch clearance after assembly and verify the piston is the matching 5-clutch design, which this drum includes.
If the cause is a cracked drum, burned direct plates or a failed piston, yes. Broken pump hub sealing rings and a cut piston seal cause the same symptoms, so replace those rings during the install and pressure test first.
The listing covers both the TH350 and TH350C from 1969 to 1986. Match the thrust bearing or washer style and the roller clutch race to the drum you remove, or send us your year and VIN.
