5L50E Overhaul Kit 2005-2006, new other (see details) and ready to install. Fits the 5L50E. Ships fast from the USA.
This is the genuine GM service overhaul kit, part number 96042883, for the 5L50E five-speed behind the 4.6L Northstar V8 in the 2005-2006 Cadillac STS and SRX. If your STS or SRX is leaking at the pan or front seal, slips once it is warm, or takes a long time to pick up Drive or Reverse after sitting, and you are planning to pull the transmission and reseal it, this is the factory gasket and seal set GM catalogued for exactly those two models and years.
GM has discontinued this part number, and the kit we have is new old stock: never installed, still in GM packaging, but it has been on a shelf. Look the rubber over when it arrives, as you would with any discontinued factory kit, and soak the seals before use.
The 5L50E is the heavier-duty version of GM's Strasbourg-built rear-drive five-speed. Transmission Digest notes that Cadillac used it only with the 4.6-liter engine, which is why this kit is tied to the V8 STS and SRX. Inside, clutch packs are applied by oil pressure on pistons, and that oil has to travel from the valve body through the case and into drums that are spinning. Sealing rings carry the oil across those rotating joints, and lip seals and O-rings hold it at each piston. Gaskets seal the case, the pump and the pan.
On a 5L50E with high mileage and years of Northstar heat soak, the rubber hardens and the rings wear their grooves. Apply pressure bleeds away before it clamps the clutches, so the unit slips and flares even when the friction material is still serviceable. A reseal with the factory kit puts the hydraulic side back to spec and stops the outside leaks at the same time.
This transmission also has a reputation for valve body bore wear and solenoid faults, and both produce harsh or slipping shifts that can look like a seal problem. Rule those out before you commit to a teardown.
Scan for codes and watch commanded gear, fluid temperature and slip on live data. A pressure gauge on the line tap tells you more: low pressure at idle points to the pump or a large internal leak, while a drop in only one range points at that clutch circuit. Our line pressure testing guide covers the hookup, and the slipping diagnosis guide lists what else to check. Then drop the pan: burnt fluid and a layer of friction material mean the clutches are finished and you need more than seals.
GM catalogs 96042883 for the 2005-2006 Cadillac STS with the 4.6L V8 and the 2005-2006 Cadillac SRX with the 4.6L V8, rear-wheel drive transmission case. It is not listed for the V6 STS and SRX, which use the lighter 5L40E, or for BMW versions of this transmission family. Confirm the unit by reading the ID tag on the case before ordering, or send us your year and VIN and we will check it. Other parts for this transmission are on our 5L50E parts page.
| Fits | 5L50E 2005-2006 |
| Part type | Overhaul Kit |
| Condition | New Other (See Details) |
| Brand | GM |
| Reference | 96042883 |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
GM lists it for the 2005-2006 Cadillac STS 4.6L V8 and 2005-2006 Cadillac SRX 4.6L V8. V6 models use the 5L40E and are not covered.
Yes. It is GM part 96042883 in GM packaging. GM has discontinued the number, so this is new old stock that has never been installed.
No. GM describes 96042883 as a service overhaul kit with gaskets and seals. Frictions, steels and pistons are separate; the 5L50E master rebuild kit covers the frictions.
Read the ID tag on the transmission case. In Cadillacs, the 5L50E was paired only with the 4.6-liter V8.
Only when the cause is leaking circuits. Valve body bore wear and solenoid faults are common on this unit and cause similar complaints, so test line pressure and read codes first.
