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Old 08-30-2013, 07:01 AM   #1
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NEED OPINON ASAP on new bus

We currently have a 36 ft TC 2000 Front engine wiht a 545 and 4.38 rear end. Mileage is 10-13 depending n speed ( rpm) 55- 13 65 -10. We max out at 68-70 ( flat nose wind dependent) We are planning on buying a pusher next week but it is a high ceiling 40ft with a newer 5.9 (not isb) with a 643 and 4.78 rear end.
Can anyone tell what speed/mpg to expect form a 40 foot BB Rear with a 5.9 643 tranny and a 4.78 rear end. We will be driving it back from out west.
I am having concerns since I have read some post where this rear end they had the tach buried to go 62. But I did not know that "posts" tranny.
Will the 643 get better mpg/speed than the 545 even though they are both 1:1 since it is lockup

What kind of mileage with this config @ 55-60????
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Old 08-30-2013, 11:25 AM   #2
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Re: NEED OPINON ASAP on new bus

Shooting from the hip; I dont think you are going to do as well as the bus you are replacing for mpg or speed. The 643 is however a huge improvement.

You are adding height and length, which is weight and resistance.
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Old 08-30-2013, 10:39 PM   #3
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Re: NEED OPINON ASAP on new bus

Every bus is different even with the same specs. I doubt the tach would be pegged with a MT643 and a 4.78 rearend @ 62 mph. The 643 is way better than a 545 on the freeway.
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Old 08-31-2013, 01:14 AM   #4
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Re: NEED OPINON ASAP on new bus

Is the tire size the same?
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Old 08-31-2013, 09:11 AM   #5
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Re: NEED OPINON ASAP on new bus

Wow what a last 24 hrs. We looked at 40 in Detroit and realized to long. As a long shot we happen to look at inter w 466e and 5speed md3060. Now get this it was geared to do 65 @ 1650 rpm. It did have some rust. It drove better than bb, turned sharper and quieter. I know most like bb. I was a die hard 5.9 guy but to get a world tran 1650 rpm for 3500 with some rust. Any opinion on 2001 int amtran w 466e
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Old 08-31-2013, 12:32 PM   #6
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Re: NEED OPINON ASAP on new bus

The DT is a great engine! Economy won't be as good as a Cummins but I wouldn't let that turn you away. Can't comment on the amtran part, those were after my skoolie service days.
That's a nice gearing setup.
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Old 08-31-2013, 07:12 PM   #7
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Re: NEED OPINON ASAP on new bus

Any tranny is better than the slip-o-matic 545....466 is a sleeved engine correct,which means you can do an in frame.....
Mileage I don't think will be different....but! I "think" jakes can be added to the 466...am I right?
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Old 09-01-2013, 09:54 AM   #8
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Re: NEED OPINON ASAP on new bus

Quote:
Originally Posted by bansil
the slip-o-matic 545....


x2


the one with a retarder would be my pick
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Old 09-01-2013, 06:10 PM   #9
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Re: NEED OPINON ASAP on new bus

Quote:
Originally Posted by turf
Quote:
Originally Posted by bansil
the slip-o-matic 545....


x2


the one with a retarder would be my pick
Is that the shorter one
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Old 09-01-2013, 11:03 PM   #10
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Re: NEED OPINON ASAP on new bus

After using both, I would choose the retarder.
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