My new MC-5C - Allison swap thread!

[bevans6]

So I am looking at it seriously.  I've found a rebuilt MT-644 a few hours away, no price yet, and the guy said his tech was asking all the right questions for how to make this bolt up actually bolt up.  He said they specialize, to an extent, in old stuff and have a lot of adaptors, flex-plate to flywheel, sae to sae and such, on their old cores.  So I am feeling good about this so far.

Questions -
What does a rebuilt MT644 cost?
if I have a choice of torque converter, which one do I want and why?
What diameter ring gear and tooth count on the flex-plate?
Is the 8V-71 crank flange an SAE standard of any kind?
I asked if it could have a yoke output rather than flange, this mentioned in Fred's old thread.  What specification of yoke would I ask for?  If you have a yoke on the output of a transmission do you have bolt on caps for the U-joint, or press fit?
Various points about dropping the front of the engine, raising the rear of the engine.  I have almost zero clearance over the engine in my install, since I have a custom turbo blower top.  I designed and built the turbo install, so I can do it again, but I would rather not.  Can I get the angle and clearance by say dropping the front a quarter inch and raising the rear a quarter inch, rather than just raising the rear?
What do I do about a shifter?  Is it a cable deal?

Thanks, Brian

[bobofthenorth]

I sold my rebuilt MT643 for roughly $1000 Canuck bux about 4 years ago now.  I say "roughly" because I took it as a credit toward work that the shop did on another vehicle.  So an actual cash value was probably more like $800. 

[luvrbus]

Give me a shout and I'll send the aftercooler when you get close

[Paso One]

For the shifter Brian I would use a Stone Bennett 40 ft of air line and cable run anywhere you want to run it.
I put one in and Love it. Idiot proof.

[bevans6]

Clifford - Ha!  I thought we had forgotten about that whole thing.  I haven't forgotten I owe you for shipping charges, so please don't you forget!.. I am starting to pull the engine package out probably tomorrow, so maybe the aftercooler is going to be part of the project!

Any new comments on my list?

Brian

[Lin]

I think it was mentioned in Fred's thread, but just in case-- the 640 shifter is different than the 740 shifter.  I learned that by assuming that were the same, so if you are going mechanical make sure you get the right one.  Also, the shift lever on the transmission that attaches to the cable is slightly different.  I the transmission I bought had the 740 lever on it.  We were able to re-drill it though to get it to hit the shift points correctly.  If you need it, I could probably give you the measurements when the time comes.

[Tom Y]

Brian, Yes you want a yoke output to save on length. On mine the caps of the u joint bolt on from the ends.  Tom

[luvrbus]

Lot of people just use a Hurst or Mr.Gasket shiftier for a shift tower on the 600 series   

[Dave5Cs]

Whats a Stone Bennet shifter run cost wise Aprox for a MT 644 Air type
Dave

[luvrbus]

Whats a Stone Bennet shifter run cost wise Aprox for a MT 644 Air type
Dave

New from United $ 2500.00 

[TomC]

Just my opinion, but the MT644 is a bit lacking in capacity to put behind a turbo 8V-71. An HT740 would be more appropriate-course probably too long though for an MC-5. Good Luck, TomC

[bevans6]

The shop just called and said that while they have a rebuilt 644 on the shelf, they can upgrade it to 647 specs for $500 extra.  Apparently the case is the same and they have the internals available.  What do you think?  Does this sound right?

Brian

[luvrbus]

The 647 spec would be better for you with the tank engine

[TomC]

Yes the 647 is rated to 950lb/ft torque-very close to what your engine puts out-smart choice. Good Luck, TomC

[bevans6]

Link to my driveshaft thread, to keep this all together.
http://www.busconversions.com/bbs/index.php?topic=31148.0

Brian