Will a 4t80e trans bolt up to 3.8 engine?
No, a 4T80E transmission will not directly bolt up to a 3.8L engine. The 4T80E is a transmission designed for larger displacement engines, typically found in GM vehicles with engines significantly larger than the 3.8L. The bellhousing patterns are different and incompatible. You would need significant and extensive modification, likely including a custom adapter plate, to even attempt such a swap, and it wouldn't be a simple or straightforward undertaking.