Quote:
Originally Posted by TOP GUN
it would seem my 358 rears gears are causing both the fan problems and poor fuel mileage. a freids truck has 3.21 ratio. what do you other 450 mercendes owners have for gear ratios? i drive at 80 and max speed is 83 engine is maxed out a lot of times on open interstates/ my truck has mercendes axles that donot offer anything between 2.40 and 3.58 thanks for any imput.
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I would back off of the throttle and run at a slower speed. I have a M2 with a 330 hp Mercedes. I run 65 and get about 8.5 mpg hauling 15000 LB trailer. I make just as good of time in the toter running slower than in the dually because I don't have to stop for fuel, food or bathroom. I don't think it's a good idea to run maxed out. That probably why the fan keeps coming on. Mine never comes on at highway speed even in hot Florida weather. You are pushing a lot of wind at that high speed.