Quote:
Originally Posted by Phil_F_NM
So it could just be the case that I have a shorter ring gear and the engine feels like it starts to wind out at 70mph? I still have power to go faster but I don't want to push it since this is my only car and I just need it to work. 60mph for my personal top speed getting 30mpg is perfectly fine for me.
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The 1978 300D should have a top speed of around 88 mph, on the speedometer it usually is a bit higher. Before the Vmax, it will start to lose power, as the governor starts to take back the rack.
You can check whether the lever of the IP reaches the full-load stop if you press the accelerator (an assistent will come in handy, or use a brick, do this with the engine off). If not, adjust the linkage according to the FSM.
Three-speed automatics were only used on the V8s back in the days.