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Old 10-13-2015, 03:00 PM   #1
Mini-Skoolie
 
Join Date: Jun 2013
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Engine: 5.9L Cummins
5.9 to MT643 Questions..

My Bus has a 545, I am cooking the thing so I bought a MT643. I have scoured the interweb for HOURS and cannot find a definitive answer.

Without pulling the 545, I have to assume its SAE#2 bellhoushing....

So are the Flywheel and adapter (not bellhousing) different between the 545 and 643?

Is the Flywheel and adapter (for MT643) the same between the 5.9 and 8.3 Cummins?

I have the part #'s for 5.9 to MT643, but i can not find the part numbers fro 5.9 to AT545....

23045240 is the 643 to 5.9 Flywheel
23045241 is the 643 to 5.9 "adapter"

Anyone know anything else for sure??
I can't be the only person to do this...!!!

THANKS, Todd S.
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Old 10-13-2015, 03:10 PM   #2
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If I remember correctly, all 543's are SAE #3 (I know for a fact my last two were). And, once again, if I remember correctly, all Cummins 3.9 & 5.9's are also SAE #3 (my current 3.9 is for certain). Ergo...all 543's should bolt up directly to any 3.9 or 5.9 and the 643 should be the same.

Also...the new 5th gen Allison 6 speeds are also SAE #3. That is what I have bolted up to my 3.9.

NOTE: Allisons typically set at about a 3 degree angle off vertical which forces the engine to be tilted to the passenger side a bit in order for the tranny to be flat & parallel to the ground. All of the P-30 vans, taco trucks & such had the famous "Cummins Tilt" as seen below on my '46 Shorty.

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Old 10-13-2015, 03:28 PM   #3
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Says SAE#3 on here....
AT545 and "B" and "ISB" Cummins.

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Old 10-13-2015, 03:39 PM   #4
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But says SAE#2 on here...................
MT643 and "B" series Cummins.

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Old 10-13-2015, 04:09 PM   #5
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Quote:
Originally Posted by Tango View Post
If I remember correctly, all 543's are SAE #3 (I know for a fact my last two were). And, once again, if I remember correctly, all Cummins 3.9 & 5.9's are also SAE #3 (my current 3.9 is for certain). Ergo...all 543's should bolt up directly to any 3.9 or 5.9 and the 643 should be the same.
Is the Hub adapter and flywheel the same from 5.9 to 8.3?
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Old 10-13-2015, 05:48 PM   #6
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B series cummins came with both sae #2 and #3 flywheel housings. I wouldn't assume anything. Measure what you have and go from there so you're not ordering useless parts. I can probably find the numbers if you desperately need them but you should be able to find them on the net, try the 4bt forums for example.

The B and C series flywheel housings should be interchangeable(save for a few odd tractor applications)

Tango, I've seen a slight tilt, but nothing like what you have. Is the camera tilted too? I can't tell.
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Old 10-13-2015, 06:10 PM   #7
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Quote:
Originally Posted by Booyah45828 View Post
B series cummins came with both sae #2 and #3 flywheel housings. I wouldn't assume anything.
According to the picture above and the Allison tech I talked to just now, all 5.9's with 545's were SAE#3, and all 5.9's with 643's were SAE#2. I gave him my Trans serial # and VIN. He called back and said 100% mine is SAE#3.

Quote:
Originally Posted by Booyah45828 View Post
The B and C series flywheel housings should be interchangeable (save for a few odd tractor applications)
He confirmed that the B and C series adapter hub and flywheel should be the same bolt pattern.
THANKS for all the help.
Anyone have a 5.9L to SAE#2 housing they wanna part with ? ?
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Old 10-13-2015, 11:21 PM   #8
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SAE 2 adaptors for the 5.9 are worth big money due to the guys putting 13 speeds in dodge trucks.

The Cummins engine is no SAE pattern. It has a adapter bolted to it. There are many different adapters. Dodge had their own to mate to the Getrag 360 ( 5 spped first gen, and the NV4500 (5 speed second gen) and the NV5600 (6 speed second gen).

Medium duty stuff like buses use SAE 3 and SAE 2. Unlike in the light duty trucks where there is only the adapter and the transmission, the Medium duty trucks use three pieces for more versatility.
You have the engine adapter, the bell housing, and the transmission.
On auto transmissions, the bell housing contains the torque converter.
On standard transmissions, the bell housing contains the clutch and flywheel.

I'm sure I have seen MT643's with SAE 3 torque converter housings.

I have also seen combo's like a DT 466 with a SAE 2, a slim ring to adapt it down to a SAE 3 to connect a AT545 to it.

Industrial application's like generators are a completely new set of adapters.

Here is a chart to help you figure out what your new MT643 is.



Hope this helps.

Nat
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Old 10-14-2015, 03:42 PM   #9
Mini-Skoolie
 
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Quote:
Originally Posted by nat_ster View Post
SAE 2 adaptors for the 5.9 are worth big money due to the guys putting 13 speeds in dodge trucks.
Well, I gotta have one......


Quote:
Originally Posted by nat_ster View Post
The Cummins engine is no SAE pattern. It has a adapter bolted to it.
I understand that. The engine adapter is one bolt pattern on the engine end and SAE on the other (trans end).
The B series engines and the C series are different patterns. (so says the allison dealer i talked to )


Quote:
Originally Posted by nat_ster View Post
Medium duty stuff like buses use SAE 3 and SAE 2. Unlike in the light duty trucks where there is only the adapter and the transmission, the Medium duty trucks use three pieces for more versatility.
You have the engine adapter, the bell housing, and the transmission.
On auto transmissions, the bell housing contains the torque converter.
On standard transmissions, the bell housing contains the clutch and flywheel.
I understand that too. Not my first rodeo.


Quote:
Originally Posted by nat_ster View Post
I'm sure I have seen MT643's with SAE 3 torque converter housings.

I have also seen combo's like a DT 466 with a SAE 2, a slim ring to adapt it down to a SAE 3 to connect a AT545 to it.
If you saw a MT643 with a #3, it wasnt from a B series Cummins.

The trans I have is from a Cummins, it HAS to be..... Otherwise the torque converter will be the wrong ratio, and the and shfit points wont be at the right RPM's.



Quote:
Originally Posted by nat_ster View Post
Here is a chart to help you figure out what your new MT643 is.
Hope this helps.

Nat
Yes, I have this chart.

The problem is, I cannot pull the 545 to see if its #3 for sure. I cant have it sit in my buddies shop that long.
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Old 10-14-2015, 03:45 PM   #10
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Here is my bus...








I built it into a camper. 6500W Onan, Roof A/C, TV, DVD, Carpet, bla,bla,bla.
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