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Old 01-11-2005, 10:57 AM   #1
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Help with speed (trans and rear end)

Some of yall have seen "willow" my bus. right now I have a new crate motor (IH 345) gasser. I was thinking of changing the rear end to a 2 speed and hoping the 4 speed transmission would be enough.


For further post, where do I find out what transmission and rear end I have? is there a number plate somewhere on them?
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Old 01-11-2005, 01:24 PM   #2
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I have a IH 345 with 4 speed and 2 speed rear end. The low gear is really low 50 mph tops and I can do about 70 max in high.

Not sure what you are going for but having a two speed rear end will probably only help you driving around town.
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Old 01-11-2005, 02:25 PM   #3
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Re:

I was going for highway speed. As of now I can only do about 54 max and thats with the engine wound up at high RPMs. I have power, I can pull a mountain easy enough but I just cant make any highway speed.
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Old 01-11-2005, 08:48 PM   #4
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ring and pinion

i would take a look at changing the
ring and pinion gears before swaping to a 2speed it should be a lot easer than swaping the whole rearend that will be a Big job on a bus not to metion the ring and pinion gears you should beable to get what you need to get just the right amount of speed worth a try
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Old 01-11-2005, 10:08 PM   #5
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If you have to change-out the R&P anyway, is it that much more work to swap to a 2-speed axle?

For highway speed, you probably want one (R&P or 2-speed axle) from a diesel truck...IF you have enough engine to pull it!
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Old 01-12-2005, 01:24 AM   #6
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a lot more

ya its a lot more work to change to a 2speed then to change the r&p
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Old 01-12-2005, 07:15 PM   #7
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I rode in steves bus with the 2 speed rear end. I was amazed. His bus is like a speed racer compared to my 6.6 liter ford with the at545.

It's been months since i rode in his bus, and i'm still jealous!
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Old 01-12-2005, 09:09 PM   #8
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rear ends

Well I have access to a pair of 2 speed rear ends. It was explained to me the Ford rear ends will basicly bolt up to an International Harvester.

I may try it out
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Old 01-12-2005, 11:31 PM   #9
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Lapeer: Your problem is the tranny. Bluntly, the Allison AT545 sucks. It sucks fuel & it sucks power because the converter NEVER locks up, so the engine is screaming, but you're not getting anywhere. Short of a tranny swap, I think you're stuck.
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Old 01-13-2005, 06:41 PM   #10
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I agree! The at545 sucks up a lot of power.
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