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Old 05-16-2019, 10:29 AM   #11
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Location: south east BC, close to the Canadian/US border
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Originally Posted by Booyah45828 View Post
You wouldn't happen to have make or model of the rear end that you're talking about.

All the 2 speeds I've seen, although they could be shifted on the fly, weren't really supposed to be. More of a shift it to low, crawl out of the yard with it, then shift back to high and go down the road. I've actually read online of certain motor coaches that had a 2 speed rear axle that was designed for shifting on the fly. But that was from the 60's and I'm not sure how common they were.
if I remember correctly, the split in the old Mercury 2 1/2 ton, you let off the gas momentarily to up-shift into high, and depressed the clutch when downshifting into low, all done on the fly - when hill climbing, if you couldn't shift on the fly, there would be little advantage to having a split rear end
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Old 05-16-2019, 11:19 AM   #12
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Location: Virginia
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Year: 1971
Coachwork: Wayne
Chassis: International Loadstar 1700
Engine: 345 international V-8
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Originally Posted by Sleddgracer View Post
if I remember correctly, the split in the old Mercury 2 1/2 ton, you let off the gas momentarily to up-shift into high, and depressed the clutch when downshifting into low, all done on the fly - when hill climbing, if you couldn't shift on the fly, there would be little advantage to having a split rear end
Yes this is how mine works and all the trucks(including an 68 International dump truck I owned) I have driven that had two speeds work like this as well. On my Internationals it is electrically shifted, and on GMC/ Chevy they were vacuum shifted, on the fly.

On my bus before I took the automatic out going from low to high was easy just let off the gas a little let it shift then re apply gas. To go from high to low, set rear to low(note it will not shift just because you moved the shift button) let off gas then hit it pretty good, but not enough the tranny will downshift too. Must say with the 6 speed Allison there was no real need, as shifting the tranny down to 5th gave about the same speed. Although I did do it a few times to find out. So splitting on the 6 speed did not gain much. In most of the trucks they have had 4 speed trans with two speed rear, great combo in the mountains.

Mine is 5.14 in high, low I do not know, but is a bit lower then ideal, however with it in low and the trans in granny gear it can just crawl nicely.

You know unless you are in the mountains a lot or tow heavy loads I am not so sure I would bother with a two speed for a bus.
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Old 05-16-2019, 11:21 AM   #13
Bus Nut
 
Join Date: Oct 2017
Location: Virginia
Posts: 808
Year: 1971
Coachwork: Wayne
Chassis: International Loadstar 1700
Engine: 345 international V-8
It might be hard to read but I can take a photo of the shift instructions on the glove box on my bus if anyone wants to see it.
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Old 05-16-2019, 11:46 AM   #14
Bus Crazy
 
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Join Date: Nov 2018
Location: south east BC, close to the Canadian/US border
Posts: 1,536
Chassis: still looking for my bus
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Originally Posted by Ronnie View Post
Yes this is how mine works and all the trucks(including an 68 International dump truck I owned) I have driven that had two speeds work like this as well. On my Internationals it is electrically shifted, and on GMC/ Chevy they were vacuum shifted, on the fly.

On my bus before I took the automatic out going from low to high was easy just let off the gas a little let it shift then re apply gas. To go from high to low, set rear to low(note it will not shift just because you moved the shift button) let off gas then hit it pretty good, but not enough the tranny will downshift too. Must say with the 6 speed Allison there was no real need, as shifting the tranny down to 5th gave about the same speed. Although I did do it a few times to find out. So splitting on the 6 speed did not gain much. In most of the trucks they have had 4 speed trans with two speed rear, great combo in the mountains.

Mine is 5.14 in high, low I do not know, but is a bit lower then ideal, however with it in low and the trans in granny gear it can just crawl nicely.

You know unless you are in the mountains a lot or tow heavy loads I am not so sure I would bother with a two speed for a bus.
I live in a mountain valley surrounded by mountains and valleys - I'm hoping to find a bus with a split
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Old 05-16-2019, 12:06 PM   #15
Bus Nut
 
Join Date: Oct 2017
Location: Virginia
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Year: 1971
Coachwork: Wayne
Chassis: International Loadstar 1700
Engine: 345 international V-8
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Originally Posted by Sleddgracer View Post
I live in a mountain valley surrounded by mountains and valleys - I'm hoping to find a bus with a split
Must say it would be neat to meet you one day, we seem to think alike. I do come out to Washington from time to time.
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Old 05-16-2019, 12:24 PM   #16
Bus Crazy
 
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Join Date: Nov 2018
Location: south east BC, close to the Canadian/US border
Posts: 1,536
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Must say it would be neat to meet you one day, we seem to think alike. I do come out to Washington from time to time.
I'm just across the border, 2 - 2 1/2 hours due north of Spokane - be glad to show you around and swap some stories with you if you get up this way
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