The Right Part for the Job. No Guesswork.

Listen, if you’re here, you already know what’s up. Your 2000 Eldorado with the 4.6L Northstar (that’s the VIN 9 engine, 8th digit) is acting up, and the diagnosis points to the transaxle. You need a solution, not a sales pitch. This is the exact TX56 transmission assembly, part number 1002541350, that your car left the factory with. We don’t mess around with “will-fit” alternatives that cause headaches later. This is the real deal.

This is a genuine OEM (Original Equipment Manufacturer) transmission. That means the same quality, materials, and engineering as the unit originally installed in your Cadillac. It’s built to handle the torque of that 4.6L engine and is programmed to work seamlessly with your car’s onboard computer. Aftermarket units can be a roll of the dice on shift quality and longevity. This isn’t.

Exact Fitment & Critical Information

This part is NOT universal. It is specifically engineered for:

• Year & Model: 2000 Cadillac Eldorado
• Engine: 4.6L V8 (Northstar)
• Critical VIN Code: The 8th digit of your VIN MUST be “9”. Check this before ordering. This is non-negotiable for proper operation.
• Transmission Code: TX56 (Automatic Transaxle, 4-Speed)
• Drive: Front-Wheel Drive (FWD)
• Interchange: GM/ACDelco IC # 400-03655

Important Note on Condition: This is a used, genuine OEM part. As noted in the listing, the right axle mount is broken. This is a critical piece of information for the installer. This part is ideal for a skilled mechanic or shop who can transfer components or repair the housing, or for someone needing the extensive internal parts. It is sold AS-IS for this reason. The value is in the quality and rarity of the genuine internal components.

Why a Genuine OEM Transmission Matters for Your Eldorado

We deal in OEM parts for one simple reason: they work. With a complex, integrated system like the Northstar powertrain, every sensor, solenoid, and clutch pack is designed to communicate perfectly with the PCM (Powertrain Control Module). Here’s the straight talk:

• Shift Quality: The factory calibration is preserved. You get the smooth, firm shifts this car was known for, not harsh or sloppy gear changes.
• No Compatibility Issues: Plug it in. The connectors fit. The mounts line up. The axle seals are correct. No modifying, no “making it work.”
• Durability: OEM parts are manufactured to a specific engineering standard. The metallurgy and clutch materials in this unit are the correct grade for the application.
• Preserves Vehicle Integrity: Using the correct transmission helps maintain the performance and character of your Cadillac. It’s how the engineers intended it to run.

Who This Part Is For:

This specific part, due to its noted condition, is targeted at a few key types of customers:

1. The Professional Mechanic or Transmission Shop: You have a core to rebuild or a customer with a failed 2000 Eldorado transmission. The internals of this genuine GM unit are valuable for a quality rebuild, or the housing can be repaired. This is a cost-effective source for premium OEM guts.
2. The Advanced DIYer with Repair Capability: If you have the tools and skill to address the broken mount—perhaps by welding or transferring the entire gearset into another housing—this part represents significant savings over a “perfect” used unit or a new one.
3. The Parts Resourcer or Collector: Need specific, hard-to-find internal components (valve body, pumps, planetary gearsets) for the TX56? This is your donor unit.

If you need a bolt-in-and-go solution, this part requires professional assessment and likely repair before installation. We are transparent about the condition so you know exactly what you’re getting.

How We Operate at OEMAutoPartShop.com

We’re not a generic parts drop-shipper. We source genuine OEM components from reliable networks. Our listings give you the full picture—part number, condition, fitment, and any flaws. What you see is what you get. We inventory parts like this so when you have a specific need for a specific car, you have a source you can trust to provide the correct item.</