TH400 Pump 1965-1967, remanufactured and ready to install. Fits the TH400. Ships fast from the USA.
Switch-pitch Turbo 400s are the hardest TH400s to find pump parts for. If your 1965, 1966 or 1967 Buick, Oldsmobile or Cadillac has the two-prong plug on the side of the case and now groans with engine speed, drags into Drive when hot, or slips in all three gears, a worn front pump is the usual culprit. This listing is a complete remanufactured variable pitch pump: one pump body with a new oversize gear set and one stator support, delivered with a new pump body bushing, front seal and bolts. It is the 8-bolt early design, machined back to spec and ready to align and install.
In any TH400 the converter hub turns a gear-type pump that makes line pressure, charges the converter, feeds the cooler and lubricates the geartrain. The variable pitch units ask more of it. The stator support on these pumps houses the passages and solenoid that swing the converter stator blades between a low angle for efficient cruising and a high angle for extra torque multiplication at idle and on a hard launch. The support uses a narrower stator spline than a fixed-stator pump, so a standard TH400 pump will not drive a switch-pitch converter correctly. When the gears and pockets wear, pressure drops everywhere at once: clutches slip, converter charge falls, and the stator circuit loses the oil it needs to change pitch.
Check the fluid level and filter first, then hook a gauge to the line pressure port. GM's chart calls for roughly 60 to 90 psi in Drive at 1000 rpm with the modulator connected; a reading that holds cold but sags once hot points at pump wear. Our TH400 pump failure guide walks through the gauge test and teardown checks, and the delayed engagement guide covers the causes that mimic a bad pump.
This pump fits 1965-1967 TH400 transmissions with the variable pitch feature, as used by Buick, Oldsmobile, some Cadillac models and Rolls-Royce. The pump body casting is 056 or 759, and the stator support is typically a 761 casting. There are two versions of this pump, known as #5 and #6, and the difference is whether the mounting bolt holes are recessed. Compare your old pump before ordering, or send us a photo of its face with the year and VIN and we will confirm which version you need. Fixed-stator 1964-1967 units take the first-design TH400 pump instead, and every other early part is on the TH400 parts page.
A pump that wore out usually took the clutches with it. Plan on the TH400 overhaul kit for 1965-1967 for gaskets and seals, and the lip seal installer tool to seat the front seal square.
| Fits | TH400 1965-1967 |
| Part type | Pump |
| 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.
A switch-pitch TH400 always has a two-prong connector on the case, and with the converter removed the stator spline at the pump is narrow. If your transmission has neither, it is a fixed-stator unit and needs a standard pump.
The two versions differ in whether the mounting bolt holes are recessed. Look at your old pump or send us a photo with your year and VIN so we ship the version that matches.
No. You get one pump body with new gears and one stator support, plus a new bushing, front seal and bolts. Test your original solenoid and reuse it.
No. The switch-pitch converter and this pump are a matched pair. Keep the variable pitch converter or convert the whole unit to fixed stator parts.
Prime the pump with DEXRON ATF before the first start, check for leaks, then confirm line pressure with a gauge and set the fluid level at full operating temperature.
