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Old 05-09-2019, 12:56 PM   #1
Bus Nut
 
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5 speed non electronic transmission w od

Was there ever such a transmission built that was suitable for skoolies? I know that with gasoline engines the jump to 5 and 6 speed autos came with electronics.
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Old 05-09-2019, 03:09 PM   #2
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The MD-3060 was used in non-electronic engine installations.

It did require a TPS on the engine.

School bus applications are generally limited to 5 forward gears. Some have had success unlocking 6th gear..
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Old 05-10-2019, 06:15 AM   #3
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Yes. but I think the controller for a 3060 is well over a thousand dollars. Is there no mechanical 4sp + OD tyranny out there?
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Old 05-10-2019, 08:16 AM   #4
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Not for our application.

If you want O/D you have the 2000/3000 series to choose from and they are all electronic.

MT-643 is mechanical and has a lockup torque converter but no O/D.
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Old 05-10-2019, 09:45 AM   #5
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there was the 7 speed allison(hd40?? I think it was mainly military).. No O/D. but OD is just a term.. you just gear your driveline (through rear gears and tire size) to make the most of the gears you have.



the allison 653 was a 5 five speed non OD with lockup, however it simply added a granny gear to the 4 existing..



you can use thue newer electronic transmissions on mechanical engines.. the MD3060 and allison 1000 are 2 modern transmissions that can work nicely on mechanical engines and give you 6 speeds 2 of them being OD..


but yes you need the wiring asnd controllers..


many of the older allisons that had more than 4 gears are very tough to find these days.. and if you do they are expensive as they were used on the bigger heavy duty busses.. some being SAE #1 which is a large bell pattern...
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Old 05-10-2019, 03:00 PM   #6
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I have heard(heard, not seen) of an OD mechanical allison transmission that was in coach use back in the 60-70's behind 2 stroke detroits.

Looking back through my bookmarks, it looks like the # is HT70.

Once again, this is an old transmission so finding someone who knows anything about them might be hard, let alone finding a transmission itself.

Only other thing I have to say about it is that it was a heavy duty transmission, and will likely have an sae 1 or larger flywheel housing, and won't easily work with most school buses.
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Old 05-10-2019, 05:24 PM   #7
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The Allison MT-40 is 6 speed but again no overdrive. Does have lock up torque converter, and is all mechanical.
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Old 05-11-2019, 06:50 AM   #8
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Thanks! But the mt643 is also a 4 speed.
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Old 05-11-2019, 07:06 AM   #9
Bus Nut
 
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Good suggestions, all of them. The Mt-40 is a rare bird - found almost nothing online about it, so have to rule that one out. I tried searching for a 3060 tps to get an estimate of the cost but could not find one. Any suggestions for how to search for this?
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Old 05-11-2019, 11:10 AM   #10
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I have an excellent used one available Mt 40 that is.
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