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Old 06-07-2015, 12:42 AM   #21
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Just don't buy a bus with a VP44 IP. You will find problems with ANY engine. Tell me if you have EVER had a perfect girlfriend? Didn't think so.
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Old 06-07-2015, 10:46 AM   #22
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If you do get a VP44 read this:

VP44 Diagnostic
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Old 06-09-2015, 02:06 AM   #23
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To Protobuzz, I think I read in one of your posts that you are an engineer. Don't take this the wrong way but I think you are over-engineering this. You will not find a perfect bus with a perfect engine and transmission and rearend. There, I said it. You can get close and that's about as good as it will get.
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Old 07-28-2015, 05:26 PM   #24
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How about transmissions?
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Old 07-28-2015, 06:02 PM   #25
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I'm an Allison fan. Just not the old AT543 (FINALLY...something most of us just might agree actually IS a Boat Anchor!). You will need something that locks up and the more gears the better...five...six if you can get'em. Closer ratios keep the motor in it's sweet spot better which translates as improved fuel efficiency and longer engine life. Most new gen five speeds can be re-programmed into six speeds but you'll have to do some homework to find the right shop to do it.

I'm sure others here can add to my personal short list.

BTW...A lot of Blue Birds from the late '70's and I believe into the early '80's were available with 2-stroke Detroits. Sadly, it was the 6V53 with a 6-71 supercharger. It is still known as "The Screamer" and ran at 3 grand plus. You don't want one. Trust me. Not really all that bad an engine, but acoustically painful. It was used in all the Swift boats in Nam and the crews used to claim that their engine noise inflicted more pain on the Viet Cong than their twin 50's.

I owned one. Never again.
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Old 07-28-2015, 06:48 PM   #26
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If you understand the limitations of each model of transmission there isn't an Allison transmission that is a bad transmission.

The AT models are lighter duty and do not have the lock up feature. Downhill can be a real exciting experience if you expected the transmission to slow you down on the way down the hill. The AT will be found behind the 5.9L, T444(E), DT(A)360, and some of the other members of the DT family depending upon the HP rating.

The MT models are medium duty and will be found behind engines over 210 HP to 300 HP and feature lock up. They will hold back going downhill.

The HT models are heavy duty and will be found behind engines with lots of HP and torque and feature lock up. They will hold back going downhill as well.

Some of the MT and HT transmissions have five gears but most have four gears. If the model number has a five in the center position it is a 5-speed and if it is a four it is a 4-speed.

The newer Allison models 1000/2000/3000 feature OD gears and lock up. In bus applications the 6-gear is usually locked out so the double OD gear isn't used. They are great transmissions but do have the added problems of electronics.
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Old 07-29-2015, 02:39 PM   #27
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Quote:
Originally Posted by cowlitzcoach View Post
If you understand the limitations of each model of transmission there isn't an Allison transmission that is a bad transmission.

The AT models are lighter duty and do not have the lock up feature. Downhill can be a real exciting experience if you expected the transmission to slow you down on the way down the hill. The AT will be found behind the 5.9L, T444(E), DT(A)360, and some of the other members of the DT family depending upon the HP rating.

The MT models are medium duty and will be found behind engines over 210 HP to 300 HP and feature lock up. They will hold back going downhill.

The HT models are heavy duty and will be found behind engines with lots of HP and torque and feature lock up. They will hold back going downhill as well.

Some of the MT and HT transmissions have five gears but most have four gears. If the model number has a five in the center position it is a 5-speed and if it is a four it is a 4-speed.

The newer Allison models 1000/2000/3000 feature OD gears and lock up. In bus applications the 6-gear is usually locked out so the double OD gear isn't used. They are great transmissions but do have the added problems of electronics.
Thank you for a basic and simple explanation on transmission models.

J
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