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Old 09-18-2013, 04:59 PM   #11
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Location: michigan
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Engine: 8.3 cummins mechanical
Re: 8.3 md 3060 mpgquestion

Thank for the response. I was struggling between the 5.9 with 643 and 8.3 with 3060. We ended up getting the 8.3 with 3060. IN the mountains coming from Oregon and Idaho we avg 10 going 60. when we went up to 70 it went down to 8.8. But when I went 55-57 we got 12.45 ( Nebraska). Thanks for all of your responses. Just out of curiosity does anyone know how the 5.9 did with the pushers with the world tranny.

anyway thanks again

David
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Old 09-18-2013, 06:45 PM   #12
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Chassis: All American RE
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Re: 8.3 md 3060 mpgquestion

I find it sad that a mechanics shop would not re program the trans for you. It's a private vehicle at this point so no chance of a school district coming down on them. I'd ask to sign whatever "release of liability" paperwork the mechanic could come up with and unleash that bad boy! Wishful thinking... i know.
My poor 643 just can't muster a 5th or 6th gear no matter how hard I try. I'm jealous
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Old 12-04-2016, 02:37 PM   #13
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We have all ours unlocked. Go to your local OEM dealer of your bus, speak with the Service Manager and tell them you need to submit a work order to the OEM for permission to unlock your 6th. The OEM will send you a letter, you then send it to your Allison's dealer. Allison will send you a liability release waiver, then will release the programming to the service techs. Ask them to activate your Economy Mode if it isn't already. This lowers your shift point, thus resulting in slightly better fuel economy. All our 6th gears are unlocked and kick in around 49 MPH (depending on your rear ratios) and reduce our RPMs by 300-350. When you do that on a "pusher", I encourage you to clean and flush your radiator and possibly install new thermostats that run about 20 degrees cooler. Remember, when you reduce your RPM, you also reduce your cooling capacity for the engine.
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Old 12-10-2016, 05:16 PM   #14
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Quote:
Originally Posted by jhagan View Post
We have all ours unlocked. Go to your local OEM dealer of your bus, speak with the Service Manager and tell them you need to submit a work order to the OEM for permission to unlock your 6th. The OEM will send you a letter, you then send it to your Allison's dealer. Allison will send you a liability release waiver, then will release the programming to the service techs. Ask them to activate your Economy Mode if it isn't already. This lowers your shift point, thus resulting in slightly better fuel economy. All our 6th gears are unlocked and kick in around 49 MPH (depending on your rear ratios) and reduce our RPMs by 300-350. When you do that on a "pusher", I encourage you to clean and flush your radiator and possibly install new thermostats that run about 20 degrees cooler. Remember, when you reduce your RPM, you also reduce your cooling capacity for the engine.
Wow, great info. Thanks!
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Old 12-10-2016, 06:09 PM   #15
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Lousy mpg for a vehicle, great mpg for a house.
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Old 12-10-2016, 07:41 PM   #16
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Engine: Cummins ISC (8.3)
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Quote:
Originally Posted by jhagan View Post
We have all ours unlocked. Go to your local OEM dealer of your bus, speak with the Service Manager and tell them you need to submit a work order to the OEM for permission to unlock your 6th. The OEM will send you a letter, you then send it to your Allison's dealer. Allison will send you a liability release waiver, then will release the programming to the service techs. Ask them to activate your Economy Mode if it isn't already. This lowers your shift point, thus resulting in slightly better fuel economy. All our 6th gears are unlocked and kick in around 49 MPH (depending on your rear ratios) and reduce our RPMs by 300-350. When you do that on a "pusher", I encourage you to clean and flush your radiator and possibly install new thermostats that run about 20 degrees cooler. Remember, when you reduce your RPM, you also reduce your cooling capacity for the engine.
Hey Jhagan,

Thanks for the info. I have been pursuing getting the 6th unlocked on my Bluebird w/8.3 & MD3060.

Can you tell us what manufacture buses you are running? I have heard that some with Thomas buses have had success getting a letter but Bluebird won't play ball.

Does this jibe with what you experienced?

Thanks.

S.
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Old 12-11-2016, 12:40 AM   #17
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I'm looking at a 1998 bluebird handy bus 8.3 cummins diesel that's in Colorado. He says it has a five speed Allison transmission. It's a rear engine. Those of you experienced with this engine. Are there any known issues I should be aware of? Do you feel that it's very reliable? It currently has 260,000 miles. Any opinions? I'm out of state so I only started speaking with him. I was thinking though that given the location it probably already geared for highway and mountain climbing which will be my intended use. I need something to travel across the country and we often visit the smoky mountains.

-Thomas
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Old 03-27-2017, 12:08 AM   #18
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Quote:
Originally Posted by jhagan View Post
We have all ours unlocked. Go to your local OEM dealer of your bus, speak with the Service Manager and tell them you need to submit a work order to the OEM for permission to unlock your 6th. The OEM will send you a letter, you then send it to your Allison's dealer. Allison will send you a liability release waiver, then will release the programming to the service techs. Ask them to activate your Economy Mode if it isn't already. This lowers your shift point, thus resulting in slightly better fuel economy. All our 6th gears are unlocked and kick in around 49 MPH (depending on your rear ratios) and reduce our RPMs by 300-350. When you do that on a "pusher", I encourage you to clean and flush your radiator and possibly install new thermostats that run about 20 degrees cooler. Remember, when you reduce your RPM, you also reduce your cooling capacity for the engine.
Any chance you could tell me which dealer you went to? I have all OEM paperwork but continue to be told Allison corporate won't respond. Thanks
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Old 04-04-2017, 03:48 PM   #19
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Chassis: Blue Bird TC RE 3904, Flat Nose, 40', 277" wh base
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Miles per gallon of diesel fuel or miles per gallon of tranny fluid? Ask Lolmstea; she knows the answer to both of those.
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Old 04-04-2017, 04:54 PM   #20
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Engine: 7.3 powerstroke MBE906
I am amazed that these busses get that good of a mileage. Our 7.3 powerstroke mini bus E350 gets 13Mpg. That is doing 55 -60 mph. Hard to imagine that something 5 times as heavy, wider and bigger tires can still do that good. I would have thought between 6 and 8 mpg.

later J
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