Here's why:
* Bellhousing: The TH350 transmission is designed for small block Chevy engines, which have a different bolt pattern on the bellhousing than big block Chevy engines.
* Input Shaft: The input shaft on a TH350 is too short to engage with the 454 crankshaft.
Solutions:
To make a TH350 work with a 454, you'll need to use an adapter:
* Bellhousing Adapter: A bellhousing adapter will allow you to connect the TH350 to the 454's bellhousing. This adapter will have the correct bolt pattern for both the transmission and the engine.
* Input Shaft: You'll also need a longer input shaft specifically designed for use with a big block engine.
Alternatives:
Alternatively, you can use a transmission that is designed for big block engines, such as:
* TH400: This is a more heavy-duty transmission that can handle the torque of a big block engine.
* 700R4: This is an overdrive transmission that is also capable of handling big block engines.
Important Note: Before making any modifications, consult with a reputable transmission shop or mechanic to ensure compatibility and proper installation.
