Just to confirm... There IS a fuel cutoff or governor or what not on my 83' 300D, correct? My tach only worked briefly at on point, but I thought my tranny was shifting near redline. However, yesterday I tried leaving it in L while climbing my hill where normally in D it shifts out of 1st around 35mph then back into 1st when the speed drops to around 20mph. So... leaving it in 1st, I was hitting 45mph (probably more like 50mph with my gauge). It was REALLY revving, but I thought I recalled Marshall or someone saying that there was a cutoff and these engines were just fine being held against it for as long as you wanted...
Thanks! Levi