5L50E Pump, used and ready to install. Fits the 5L50E. Ships fast from the USA.
If your 4.6L Cadillac STS, SRX or XLR, or an all-wheel-drive BMW with the GM five-speed, has started to whine with engine speed, hesitates before it picks up Drive or Reverse, or slips once the fluid is hot, the front pump belongs on the suspect list. This is a used GM pump assembly for the 5L50E, the heavier-duty member of the 5L40E family built in Strasbourg, France. It lets you replace a worn or damaged pump without hunting for a whole donor transmission.
The 5L50E runs a Ravigneaux planetary gearset controlled by range clutches and one-way sprags, with five forward gears from 3.42 first to 0.75 fifth. None of those clutches apply without oil pressure, and the front pump makes all of it. The pump is driven by the torque converter hub, so it turns whenever the engine runs. Its output is shaped by the valve body into line pressure for every clutch, converter feed and lockup, cooler flow and lube. The 5L50E is rated for about 311 lb-ft and vehicles up to 5,000 lb GVWR against 250 lb-ft for the 5L40E, so it holds higher clutch pressures in normal driving. A pump that has lost efficiency shows up first on this unit when the fluid is hot and the engine is at idle.
Valve body bore wear and solenoid faults are common on this family too and can mimic pump trouble, so test before you buy.
Start with the fluid level and condition and a scan for stored codes. Then take a line pressure reading at idle in Drive and Reverse, hot. Low pressure in every range that rises with RPM points at the pump or a leak in the pump circuits; normal pressure with slipping in one gear points to a clutch pack. Our line pressure testing guide covers the gauge setup, and the converter hub and pump bushing wear guide shows what to look for once the converter is out.
Fits the 5L50E. Transmission Digest notes that Cadillac used the 5L50E only with the 4.6L engine, which covers the 2004-2006 XLR and the 4.6L versions of the 2004-2006 SRX and 2005-2006 STS. BMW versions include E46 325xi and 330xi models and the E53 X5 3.0d. The 5L40E in V6 Cadillacs, Solstice, Sky and most rear-drive BMWs shares the basic design, but do not assume the pump interchanges. Read the identification tag on the left rear of the case above the pan rail, compare your old pump with the photo, or send us your year and VIN and we will check it. All our parts for this unit are on the 5L50E parts page.
Pair the pump with a 5L40E/5L50E filter and pan gasket kit so debris from the old pump is not left in the pan. If the clutches were cooked by low pressure, the 5L50E master rebuild kit covers the rest of the overhaul.
| Fits | 5L50E |
| 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.
On the Cadillac side the 5L50E went only behind the 4.6L engine: the 2004-2006 XLR and the 4.6L SRX and STS. BMW used it in E46 325xi and 330xi models and the E53 X5 3.0d. V6 Cadillacs, the Solstice and Sky use the lighter 5L40E.
The two units share the same design and gear ratios, but parts can differ between versions and years. Do not assume interchange. Check the case ID tag and compare your old pump with the photo, or send us your year and VIN before ordering.
A sound used GM pump is a common repair when the rest of the transmission is healthy. Inspect it before installing, and always fit a new front seal and O-ring and check the converter hub so the new parts are not damaged by an old fault.
A new front seal, pump O-ring, filter and pan gasket. If the old pump left metal in the pan, clean or flush the cooler lines. Inspect the converter hub and bushing contact area.
A pump problem gives low line pressure in every range, worst hot at idle, often with whine. Valve body bore wear usually shows as harsh or slipping shifts in particular gears while overall pressure looks closer to normal. A pressure gauge separates the two.
