Flying Pig Posted March 18, 2008 Share Posted March 18, 2008 I going to be adding another truck to the fleet. My last 2 were Fords and loved them both. This one will be for a hired driver. Back in '78 I drove a '74 F model with what I was told was a 300+ and a 5 speed. It proved to be a tuff one. This new job will be hauling bulk cement in a pneumatic tanker for a dedicated customer. Its about 110 miles each way and mostly level highway. Since Ill be buying the fuel, mileage is a big issue. I want BIG numbers. The truck should have a sleeper just in case of bad weather or breakdowns. I HATE computer driven trucks. Every computerized vehicle Ive owned has let me down, even the trailers with ABS. Im looking for a deadly reliable truck that wont break on me or call in sick. So help me guys, What model tractor should I get?Which engine and hp?Which transmission?Rear gear?Tire size?My current ride is pulling a van and rarely sees over 1500 rpm. It is a 3406B,400 Cat with a 14609B trans with a splitter added(.6 OD in high gear, .74 in "direct") 3.58 rears and LP 24.5 tires. This combination was getting me 6.85 mpg average for the quarter until ULSD came along. Now it is minus at least 20%. It does the same type of short haul work. Im hoping that the cement tank will have much less wind resistance and make the mileage easier to get.Thanks in advance. Quote You'll never go wrong by doing right. Who do you call when the lawmakers ignore the law? Link to comment https://www.bigmacktrucks.com/topic/3529-spec-my-new-used-truck/ Share on other sites More sharing options...
GearheadGrrrl Posted March 19, 2008 Share Posted March 19, 2008 CX (Vision) conventional with Maxicruise and 6 speed Maxitorque for on highway or 10 speed Maxitorque if you need more reduction. Get the small sleeper- it's the lightest. I'd look for around a 4.00 ratio rears on 11-22.5 tires, that'll give you a range of 35-55 MPH in direct for the side roads and about 1500 RPM at 60 for economy on the main roads. Quote Link to comment https://www.bigmacktrucks.com/topic/3529-spec-my-new-used-truck/#findComment-17674 Share on other sites More sharing options...
Flying Pig Posted March 19, 2008 Author Share Posted March 19, 2008 There is only about 30 miles of this trip each way that is 55mph or less. Its all paved. The only gravel is in the customers driveway. The rest is 65mph divided 4 lane. Id like to see the truck be able to do 65-70 and still be under 1500rpm. Its been a long time since Ive been in a Mack. Maybe its not cut out for that sort of thing. I think the six speed would be fine. I got along great with the 5 speed in that old truck. Quote You'll never go wrong by doing right. Who do you call when the lawmakers ignore the law? Link to comment https://www.bigmacktrucks.com/topic/3529-spec-my-new-used-truck/#findComment-17676 Share on other sites More sharing options...
Gambi80 Posted March 19, 2008 Share Posted March 19, 2008 There is only about 30 miles of this trip each way that is 55mph or less. Its all paved. The only gravel is in the customers driveway. The rest is 65mph divided 4 lane. Id like to see the truck be able to do 65-70 and still be under 1500rpm. Its been a long time since Ive been in a Mack. Maybe its not cut out for that sort of thing. I think the six speed would be fine. I got along great with the 5 speed in that old truck.Allegedly, Mack engines get their best mileage around 1550-1600 rpm. I always hear Macks are far from the lightest truck out there, but I see plenty in bulk tank service. I have an 18-sp with a 3:86 ratio and 22.5 tires....which puts me at 1475 rpm at 65 in top gear, 1500 plus a couple at 70 mph. I can't give you accurate mileage because I don't go on the same exact run every day like you're planning on doing, however it varies from 5.5-7.5. Quote Ever wonder how a blind person knows when to stop wiping? Link to comment https://www.bigmacktrucks.com/topic/3529-spec-my-new-used-truck/#findComment-17690 Share on other sites More sharing options...
Flying Pig Posted March 21, 2008 Author Share Posted March 21, 2008 I spoke with a used truck salesman. To my surprise he was leading me to Eaton Fuller drivelines or transmissions with only a .7 overdrive. His recommendation was 300 or 350 E7 or EM7 with a 9 or 10 speed, a 3.86 to 3.58 rear and LP 22.5 tires. He said I should run the engine about 1400 rpm.I specified that I wanted excellent fuel mileage. The run is mostly level with no real big hills.Those with experience care to comment? Quote You'll never go wrong by doing right. Who do you call when the lawmakers ignore the law? Link to comment https://www.bigmacktrucks.com/topic/3529-spec-my-new-used-truck/#findComment-17735 Share on other sites More sharing options...
Terry T Posted March 21, 2008 Share Posted March 21, 2008 I spoke with a used truck salesman. To my surprise he was leading me to Eaton Fuller drivelines or transmissions with only a .7 overdrive. His recommendation was 300 or 350 E7 or EM7 with a 9 or 10 speed, a 3.86 to 3.58 rear and LP 22.5 tires. He said I should run the engine about 1400 rpm. One thing to remember, when buying used, the salesman will explain to you that the best thing for you is the truck that is on his lot! If he has to go find you something else where then he is not moving his inventory. Or there is a good chance that he has a line on a trade in fleet of a certain spec, say a fleet of EM7 300hp or E7 350hp trucks with 9 & 10 speeds that he can buy really right, mark up $9,000.00 and still make you a good deal. This salesman might be looking out for you, but when I was selling trucks, I perferred selling used, because the profit margin is much higher for the dealer and saleman. This coming from a former Mack salesman.T. Quote Link to comment https://www.bigmacktrucks.com/topic/3529-spec-my-new-used-truck/#findComment-17737 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.