Will a Chevy 4-speed manual 4x4 transmission from 350 bolt onto 454 motor for my Chevy?

It depends on the year and specific transmission and transfer case. A Chevy 4-speed manual 4x4 transmission from a 350 will *not* automatically bolt up to a 454. While both are Chevy engines, the bellhousing bolt patterns can differ between different years and engine sizes.

Here's what you need to check:

* Bellhousing Pattern: The most critical factor. The 350's transmission's bellhousing must match the bolt pattern of the 454's engine block. These patterns changed over the years for both engines. You will likely need to find a bellhousing that's compatible with both the transmission and the 454 engine. This might involve a swap to a later model bellhousing or an adapter.

* Transmission Identification: You need to identify the *exact* transmission you have (e.g., SM465, NP435, etc.) and the year of the truck it came from. This will help determine the bellhousing pattern.

* Transfer Case: You'll also need to ensure the transfer case is compatible with both the transmission and the drivetrain of your vehicle.

* Input Shaft: The input shaft of the transmission must be the correct diameter and spline count for the 454's crankshaft.

In short: While it's *possible* with the right adapter or a compatible bellhousing, it's not a direct bolt-on. You'll need to do a thorough comparison of the bellhousing patterns and ensure all the other components are compatible. A mechanic specializing in classic Chevy trucks would be invaluable in making this determination.