Will a1986 2.6 liter dodge d-50 4x4 with 5 speed transmission bolt to a 1984 2.0 4 transmission?

No, a 1986 Dodge D-50 2.6L 4x4 with a 5-speed transmission will almost certainly not bolt to a 1984 2.0L 4-speed transmission. The bell housings, clutch setups, and input shaft splines will be completely different between the two engines and transmissions. Even if you found a way to physically connect them (which is highly unlikely without significant and costly custom fabrication), the resulting drivetrain would likely be unreliable and prone to failure. The different engine sizes and power outputs alone would present compatibility issues.