Will a 6.2 diesel fit in 1986 Chevy pickup and bolt up to 4 speed manual transmission?

A 6.2L diesel, specifically the Detroit Diesel 6.2L found in many GM vehicles of that era, *can* fit in a 1986 Chevy pickup. However, bolting it directly to a 4-speed manual transmission from that same truck is not a straightforward process and likely requires significant modification.

Here's why:

* Bellhousing: The 6.2L diesel and the gas engines used in the 1986 C/K trucks had different bellhousing bolt patterns. You will need a bellhousing specifically designed to mate the 6.2L diesel to your 4-speed transmission, and these are not common and might require fabrication or adaptation.

* Transmission compatibility: While it's *possible* to adapt the transmission, you'll need to confirm the input shaft diameter and spline count of both the transmission and the diesel's bellhousing to ensure compatibility. A direct bolt-up is unlikely.

* Clutch: You'll need a clutch assembly compatible with both the 6.2L diesel flywheel and your 4-speed transmission. This likely won't be a stock component and will require finding a suitable setup or custom fabrication.

* Mounting: While the engine might physically fit, you'll likely need custom motor mounts to ensure proper alignment and stability.

In short, it's not a simple "bolt-in" job. It's a significant undertaking requiring mechanical expertise, fabrication skills, and sourcing of specialized parts. You'll be investing considerable time and money to make this swap work. Consider the cost and difficulty before proceeding. Many opt for a more readily available conversion using a different transmission.