* Specific Engine Code: The 3400 is a family of engines, not a single type. Different codes (e.g., L67, L32) represent different internal components and potentially different accessory placements (alternator, A/C compressor, etc.). While the block itself might fit, the peripherals might not be directly interchangeable. You'll need to verify the engine code of both the donor and recipient cars. Identical engine codes are essential for a straightforward swap.
* Transmission Compatibility: The transmission must also be compatible. Make sure the transmission from the 1999 car is compatible with the 2000 car's transmission mount points and wiring harness.
* Wiring and Computer: The engine control module (ECM) and associated wiring harness are likely different. A direct swap might require extensive rewiring or swapping the ECM.
* Minor Variations: While largely similar, there might be minor differences in mounting points or accessory brackets between the 1999 and 2000 models. This could lead to some minor fabrication or adjustment work.
In short, while a *very high probability* exists of it fitting, confirming the engine code and checking for transmission and wiring compatibility is crucial. You should consult a repair manual for both years to be absolutely sure. A simple mismatch could create a frustrating and potentially costly experience.
