TH350 Pump 1969-79, used and ready to install. Fits the TH350. Ships fast from the USA.
A Camaro, Chevelle, Nova, Firebird or C10 with a 1969-79 Turbo 350 that has gone soft everywhere at once usually has a tired front pump. This is a used original GM TH350 pump for those years: a non-lockup, bearing-type pump with six sealing rings on the direct drum side of the stator hub. It is a good core-for-core replacement when your own pump body is scored, the gears are chewed up, or the stator shaft is damaged, and you want an original GM casting rather than a reproduction.
Every pound of pressure in the Turbo 350 starts at the front pump. The converter turns the inner gear, the inner gear drives the outer gear around the crescent, and the pressure regulator turns that flow into line pressure for all four clutch packs and the intermediate overrun band. The stator hub is the other half of the job: its rings seal the oil passages that feed the forward and direct clutches, so a leaking ring shows up as a slipping clutch even when the gears are fine. On a bearing-type pump, a needle thrust bearing rides between the pump cover and the direct clutch drum, which is the layout GM's 1975 manual shows.
Rule out the cheap causes first: low fluid, a blocked filter, and a vacuum leak at the modulator line. Then run a line pressure test. GM's 1976 truck supplement lists about 167 psi in Drive and 254 psi in Reverse at 1200 rpm with the modulator vacuum line off on a 350 V8. Low numbers in every range point to the pump, the filter or the pressure regulator, while low pressure in Reverse only points to the Reverse circuit. The TH350 pump failure guide walks through the full test, and TH350 common problems and fixes covers the worn bores that cause the same complaints.
This pump is for 1969-79 non-lockup TH350 transmissions. It is a bearing-type pump with six O-rings around the direct drum side of the stator, and it will not interchange with a five-ring stator pump. Pull your old pump and count the rings before you order; the ring count has to match. If your transmission is a later TH350C lockup unit, this is not the right pump. If your old pump is missing or you cannot tell what you have, send us the year, vehicle and VIN and we will check it. More early TH350 parts are on the TH350 parts page, and the resealed 1969-up TH350 pump is the option that arrives with the new bushing and seal already in.
The TH350 master rebuild kit for 1968-1979 supplies the seals, gaskets and frictions for the rest of the unit, and since an overheated pump often means the cooler loop was restricted, a TH350 transmission cooler is cheap insurance.
| Fits | TH350 1969-79 |
| Part type | Pump |
| Condition | Used |
| 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.
A bearing-type pump uses a needle thrust bearing between the pump cover and the direct clutch drum. Match the style of your old pump so the end play stack-up stays correct.
No. This pump has six O-rings around the direct drum side of the stator and does not interchange with a five-ring stator pump. Count the rings on your old pump first.
It is a used original GM pump. Install a new bushing, front seal, O-ring and gasket with it, which an overhaul or master rebuild kit covers.
No. It is a non-lockup pump for 1969-79 TH350 units. Lockup TH350C transmissions need the lockup pump.
GM's 1976 truck supplement lists about 167 psi in Drive and 254 psi in Reverse at 1200 rpm with the modulator vacuum line disconnected on a 350 V8. Values vary by engine, so compare against your application.
