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Old 10-14-2015, 07:59 PM   #11
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All AT545's are SAE 3. They don't make a SAE 2 AT545.

That's why DT466's with a SAE 2 use a ring to adapt down to SAE 3 when they have a AT545.

You don't need to pull the trans to find out. Measure and count the bolts on the SAE pattern.

If I was you, I would do a Google search to find out if the 8.3 uses the same adapter as the 5.9.

I looked once, but don't remember off hand.

Nat
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Old 10-14-2015, 10:42 PM   #12
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Quote:
Originally Posted by Scooter141 View Post
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....


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.

oops TYPO,.... I meant to say my 545 is SAE #3.

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Originally Posted by nat_ster View Post
All AT545's are SAE 3. They don't make a SAE 2 AT545.

That's why DT466's with a SAE 2 use a ring to adapt down to SAE 3 when they have a AT545.
I have never heard of an adapter ring...

Quote:
Originally Posted by nat_ster View Post
If I was you, I would do a Google search to find out if the 8.3 uses the same adapter as the 5.9.

Nat
I was told by a Allison tech, the Engine adapter is different, but the flywheel and hub adapter should be the same.

And when I say adapter, I mean the hub adapter not the flywheel housing.
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Old 10-16-2015, 12:41 AM   #13
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Ok, this is the easiest way to tell what flywheel housing you have. Look at where your 545 joins the engines housing. if it bolts directly to the housing you have a sae#3, if there is a reducing adapter between the trans and engine flywheel housing you have a #2
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Old 10-16-2015, 01:41 AM   #14
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Originally Posted by Scooter141 View Post
I have never heard of an adapter ring...
Nothing more than a ring of steel about half inch thick with the bigger SAE2 bolt pattern on one side, and the smaller SAE3 bolt pattern on the other.

They use them both ways. Some engines never had a SAE 3 adapter but bus manufactures still wanted to use SAE 3 transmissions so they made a spacer / adapter ring.

Bluebird 90 knows what I'm talking about.

Nat
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Old 10-16-2015, 09:48 AM   #15
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Yeah, I forgot to mention that you would see 2 different bolt circles. I have seen some adapters that were nothing more than a spacer for the same bolt patturn
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Old 10-16-2015, 10:21 PM   #16
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Yeah, I forgot to mention that you would see 2 different bolt circles. I have seen some adapters that were nothing more than a spacer for the same bolt patturn
Sometimes that is a solution for a input shaft that was to long with that combo.

Nat
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Old 10-23-2015, 04:40 PM   #17
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My Engine and trans are SAE #3........
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Old 02-13-2016, 09:44 AM   #18
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I know this is an older thread, but this thread seems to have the most info on this subject I have found thus far. I recently picked up a Thomas MVP flatnose shorty and want to replace the 545 with a 643 for obvious reasons. (And repaint it for obvious reasons...)

I can't find a part number for the flywheel housing on the diagrams shown on this thread. Does anyone have the Cummins part # for a 5.9 ISB SAE #2 flywheel housing?
Thanks in advance!
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Old 02-13-2016, 10:24 AM   #19
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Cummins Flywheel Housing - Cast Iron - 4B, 6B, ISB

http://www.vanderhaags.com/detailview.php?part=24200840
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Old 02-13-2016, 10:59 AM   #20
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Perfect, exactly what I was looking for!
Thanks!
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