Comment by grogenaut
To explain different. Cars are geared like a bike in the fastest gears, starting takes a lot of torque. Tractors are like the slowest gear like a mountain bike climbing gear. In addition a tractor motor is like a champion squatter and a car's is like a the fastest kid at your school (Olympic sprinters are still strong).
Cars spend no time at .5 mph but plenty at 60. Tractors spend almost no time above 15 and tons of time at .25mph. tractors will pull your house over. Cars won't.
You can pop the clutch in idle in 6th in a tractor and it'll likely start