my 40 11/4 ton has a 228 and i can run 47 all day and can hit 50-53 if i need too. when i first got it 40 was about all i could get. the engine and tranny is noisey so it sounds like it is going faster than what it is. at 50 the 228 is turning 2432 rpm according to the rpm/mph chart and sounds like it is screaming. back it down to 45 its 2189 and in the 2/3rds operating range and you can actually hear yourself think. big difference in noise in only a 250 rpm increase.
if you have a two speed rear and its in low range it will be screaming and going nowhere. i see its a fire truck, depending on the fire body it could be a lead sled. the ashton had a 248 in it and weighs in at 10000 with nothing on it and could easily hit 50 but then the tranny is a sm420 and a lot quieter than the crash boxes.
