4T60E Pump 1983, remanufactured and ready to install. Fits the 4T60E. Ships fast from the USA.
Owners of 1990s GM front-drive cars with the 4T60E, such as the Lumina, Regal, LeSabre, Park Avenue, Cutlass Supreme, Eighty-Eight, Grand Prix and Bonneville, usually land here after a slow shift into gear or a pressure test that came up short. This listing is not a full pump. It is the vane pump slide on its own, a remanufactured 84979 slide that also cross-references to GM numbers 8656276, 8656272, 8662901 and 8662904. The slide is listed for the 440-T4 transaxle and its electronic successors from 1983 on, which is where the 1983 in the name comes from. Its listed height is 17.968 mm.
The 4T60E, like the hydraulic 440-T4 before it, uses a vane-type oil pump. A rotor carries the vanes, and they sweep around inside a slide that can pivot. Moving the slide changes how far off center the rotor sits, and that changes how much oil each turn delivers. With the engine idling and pressure low, the priming spring holds the slide out for full delivery. Once pressure is up, the slide is pushed back and the pump coasts. Every apply circuit, the converter feed and the cooler flow depend on that action, so a worn slide shows up in all gears at once instead of in one shift.
Start with the fluid level checked hot, then put a gauge on the line pressure tap. If idle pressure is low and stays low, the pump is the main suspect. If idle pressure is fine but will not climb, the valve body deserves a look too: Sonnax ties low line rise and soft shifts on the 4T60 family to a worn boost valve, and erratic pressure to a worn pressure regulator. The 4T65E evolved from this unit and the pump layout is closely related, so our pump failure guide and delayed engagement guide apply here as well. Once the pump is apart, look for scoring where the slide rides, a worn pivot pin bore, and too much slide end play. The 4T65E figure Sonnax publishes is 0.0003-0.0016 in, which makes a sensible reference point when you check yours.
The listed application is the GM front pump slide for the 440-T4, 4T60E and 4T65E, 1983-up. Over that span GM revised the pump more than once, so the safest check is to put a micrometer on your old slide, compare it to 17.968 mm, and look for any of the cross-reference numbers above. Our 4T65E and 4T60E parts collection lists the related pump hardware. If you cannot read a number or the height does not match, send us your year and VIN before you order.
Swap the slide with the pump on the bench. Clean both pump halves, fit the slide with its seal and spring, and check that it pivots freely before closing the pump. Torque the pump bolts evenly to the factory spec and prime the pump with fluid before the first start. If the pocket faces or rotor are worn too, a complete 4T60E pump assembly is the smarter repair, and a 4T60E master rebuild kit covers the seals and frictions if the unit is coming apart anyway. Many owners now fill with Dexron VI, which is backward compatible where earlier Dexron was specified.
| Fits | 4T60E 1983 |
| Part type | Pump |
| Condition | Remanufactured |
| Brand | GM |
| Reference | TH440 |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. It is the pump slide alone, part 84979. Buy a complete pump assembly if the pump body, rotor or pocket faces are also worn.
Yes, the listing covers the 440-T4 (also written THM440-T4) as well as the 4T60E and 4T65E, 1983-up. Compare your slide height to 17.968 mm to be sure.
84979, and the GM interchange numbers 8656276, 8656272, 8662901 and 8662904.
Only if the slide is the worn part. Test line pressure hot first. Low idle pressure that stays low points at the pump; normal idle pressure with no rise can also be boost valve or regulator wear in the valve body.
The slide seal and priming spring if worn, the pump gaskets, and fresh fluid. If the case is apart, a rebuild kit with seals and frictions is worth doing at the same time.
