I'll lay it out
74 K20 full time 4x4
383 GM crate motor 450 HP, 465 ft torque
350 Turbo 3 speed auto transmission, rebuilt.
411 gears ( a grunt)
The motor has 100 miles on it.
I'm pulling a 6000 lb RV trailer (attempting)
It feels like I'm at 14000 feet pulling it up a steep mountain pass...