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Will a transmission out of 2000 Chevy Express van vortec v8 5.7 liter go in 2001 silverado 5.3 liter?

It's highly unlikely that the transmission from a 2000 Chevy Express van with a 5.7L Vortec V8 will directly fit into a 2001 Silverado with a 5.3L Vortec V8. Here's why:

* Different Engine Families: The 5.7L Vortec in the Express van is likely a Gen I Vortec, while the 5.3L in the Silverado is a Gen III Vortec. These engines have different bellhousing bolt patterns, meaning the transmission won't physically bolt up.

* Transmission Types: The Express van may have a different transmission type than the Silverado. Even if the bellhousing patterns were compatible, the internal components (like gear ratios) might not match.

* Computer Control: Transmission control systems have evolved. The transmission from the van may not be compatible with the Silverado's computer system and wiring harness.

Here's what you should do instead:

1. Identify the specific transmission: Look up the transmission code on the driver's side of the transmission case.

2. Research compatibility: Use online resources like forums, parts websites, or consult a mechanic to determine if there are any compatible transmissions for your Silverado.

3. Consider a rebuild: If the Silverado's original transmission has issues, it might be more cost-effective to have it rebuilt by a reputable shop.

Important Note: Using the wrong transmission can cause serious problems with your vehicle's performance and reliability. It's best to get expert advice before attempting any transmission swap.