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Old 06-14-2005, 10:17 PM   #1
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bus differential

I have a 1984 international s1700 71 pass,345 gas,at545 trans. what will get this bus do go faster than 55. thanks brian
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Old 06-15-2005, 08:01 PM   #2
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Chassis: International Harvester S-1700
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A big, long hill?

A big, long hill?

What rear end ratio do you have? See if you can find the line ticket, that has all the bus's specs on it. It is a sheet about 4" wide and 12" tall. Mine was glued to the inside of the hood. The rear end ratio would be listed on the line ticket, probably. Mine was.

My rear end is 6.5:1. Sheesh! The bus will do 50mph flat out on level ground. I thought it was only going 45, but my son clocked me in his car, and the speedo is WAY off. Like 5mph off from 20 on up. That's good to know.

I have the AT540. I don't think the transmission is the limiting factor in my situation, and it may not be in yours. Find out your differential ratio. If it were a car, you could jack it up and rotate the wheels and count the driveshaft turns, but on a bus....
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Old 06-22-2005, 10:13 AM   #3
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Uhh...push it off a cliff? With the AT545, any MPH increase is an uphill battle.
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Old 06-22-2005, 07:49 PM   #4
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i have a 716 gear. what if i put a two speed split rearend?
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Old 06-22-2005, 11:39 PM   #5
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Rear End Ratio

Your rear end ratio is 7.16 to 1? Is that right? The best and cheapest thing you could do is to get a lower ratio differential, IMHO. Adding a two speed rear end really won't help you any unless the final ratio changes. Two speed rear ends, from what I understand, are usually configured so that they don't add top end speed, but give you the option of dropping into very low gears (even higher ratio).

I've seen used differentials for IHC products here: http://www.trucks.com/parts_inventor...ort=1&dir=desc for anywhere from $750 to $1250. You're probably looking at another $750 to get one installed (guesstimate). Total cost from $1500 to $2000. That'd buy a lot of gas or diesel...

I want to do a differential swap someday so I can use the Interstate highways. Right now I'm limited to secondary roads because my top speed is somewhere in the neighborhood of 45-50MPH.

I doubt fooling with the tranny is going to give you any advantage, simply because the limiting factor is the final drive ratio, and until that changes, no amount of (expensive) transmission work is going to make any difference for you. IMHO, YMMV.
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