4T65E Pump, new and ready to install. Fits the 4T65E. Ships fast from the USA.
A 4T65E that will not move in any gear, that lost all pressure right after a valve body or side cover job, or that has a pump shaft with chewed splines or a worn bearing surface needs a new oil pump drive shaft. That is what this listing is: a new 4T65E oil pump drive shaft, part number 84671G. It is not a pump body. It is the long shaft that connects the torque converter to the pump rotor, for the Impala, Monte Carlo, LeSabre, Century, Grand Prix and other 1997-2011 GM front-drive cars that use the 4T65E.
On most rear-drive automatics the pump sits right behind the converter and is driven directly by the converter hub. The 4T65E is laid out differently. Its vane pump is mounted on the valve body and channel plate under the side cover, at the opposite end of the unit from the engine. A long drive shaft runs from the converter, through the channel plate, to the pump rotor. The shaft is splined at the pump end and rides in a sleeve in the channel plate. Every revolution of the engine turns it, so if the shaft is not engaged, is broken, or has stripped splines, the pump stops and there is no line pressure at all.
Check the fluid level first; an empty unit also gives no movement. Then put a gauge on the line pressure tap. Zero pressure with the engine running points at the pump drive, not the clutches. If pressure is present but low, the shaft is probably fine and the problem is pump wear, the boost valve, or a worn AFL valve bore, so work through our 4T65E pump failure guide instead. With the side cover off, pull the shaft and look at both spline ends and the bearing surface. Sonnax lists a worn or damaged pump shaft sleeve as one of the four common 4T65E channel plate problems, and a shaft that has been riding on a worn sleeve will show the wear on its surface too. Our 4T65E common problems guide covers the related channel plate faults.
The listing covers the 4T65E automatic transaxle used in 1997-2011 GM front-drive cars; see our 4T65E parts page for the full range. The listing does not split the shaft by year, and GM changed the pump to a three-piece design in June 2002, so lay your old shaft next to the new one and compare overall length and both spline ends before installing. If they do not match, or you want us to check first, send your year and VIN.
Replacing the shaft means removing the side cover, and on most cars that means supporting the engine and dropping the left side of the cradle or removing the left axle. Inspect the channel plate sleeve and press in a new one if it is worn. Slide the new shaft through until it is fully seated in the converter, then make sure it engages the pump rotor before the side cover goes back on. If the pump itself is worn, pair the shaft with a 1997-2001 4T65E pump or a 2002-up three-piece pump. Use new side cover gaskets, refill with Dexron VI and check the level at 180-200 F.
| Fits | 4T65E |
| Part type | Pump |
| Condition | New |
| 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.
It is the oil pump drive shaft only, part number 84671G. It connects the converter to the pump rotor. Order a complete pump separately if the pump is worn.
The most common cause is a pump drive shaft that is not engaged in the pump rotor, so the pump never turns. Confirm with a line pressure gauge: zero pressure points at the pump drive.
The listing is for the 4T65E without a year split. GM changed the pump design in June 2002, so compare length and both spline ends against your old shaft, or send us your year and VIN.
If it shows wear, yes. A worn pump shaft sleeve is a known 4T65E channel plate problem, and a new shaft running in a worn sleeve will wear the same way.
Dexron VI. Check the level at operating temperature, about 180-200 F, after the repair.
