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5.9 cummins and 6 spd allison conversion
3 Replies

hello, somebody out there has done the 5.9 diesel and 6spd auto conversion on a early flx...and is getting great mpg...im looking to do the same thing, what do i need to know?..  Continue

Tags: flxible, allison, conversion, diesel, 5.9

Started this discussion. Last reply by sam d May 17, 2011.

 

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City and State where you are located. Do not use zip code, you know what it means but it means nothing to the rest of us.
rochester ny
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looking to rebuild a flxible bus 40s...concert from a gas to a 5.9 6 speed...

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At 12:36am on April 22, 2011, Gary Sebastian said…
That sounds like a good deal to me Sam. Where is that guy? A six speed makes sense for economy and better gearing for hills. A pusher school bus would be ideal for a donor. I wonder what brand bus would have a 97 or 98 5.9 pusher. I read somewhere that a pulling set up will work but you have to turn the axle upside down and reweld everything and relocate the plugs. When I do this I will have to hire it done, hopefully by someone reliable. Have you followed the "where is Ben" vintage bus project, he has a web site called "Creative Cruiser" and is repowering a Flx.
At 11:47pm on April 20, 2011, Gary Sebastian said…
Sam, I have been looking for a Dodge pick up with the 5.9 Cummins (they are not cheap) to replace a 2003 gas Dodge that only gets 12.5 mpg.. I have several friends who are really in to these engines and they suggest the 12 valve models built from about 1992 to mid 1998. These engines are very reliable and fuel efficient but I don't know what a 25,000 pound bus woud do to the fuel miliage. When I am ready to convert my Flx I will look for a 5.9, 12 valve retired school bus at an auction. School buses usually get good maintenance and have good records of their care. Diesels run at a lower rpm and are geared accordingly, by buying the bus you get the tranny and all the accessories. I think being able to drive the school bus a little will give you some idea of what to expect and after the transplant you can sell the bus for scrap and recoup a little money. One other thing, the engine has to be turned backwards in the Flx, so the rear axle will have to be flipped to make it work.
At 10:51pm on April 19, 2011, Gary Sebastian said…

Welcome Sam, I also have a 60 model Flxible bus with a dead gas motor and would like to repower with a Cummins 5.9. Its on the back burner right now.

 
 
 

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