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Old 02-16-2010, 04:17 PM   #1 (permalink)
DesertRage
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Allison Cooler Line Thread Size?

Can any verify what thread is in the side of the allison transmission? I am talking about the female thread that the quick disconnect adapter is threaded into on the transmission housing.

I would like to remove the adapter and connect directly to the trans with a JIC style fitting. A trans shop told me it was either a -10 or -12 orb fitting, but they were not sure which. For reference a -10 has a 7/8-10 thread and a -12 is 1 1/16-12. I measured the hex flats on the adapter and they are 1 1/4. I would like to get all the parts before I start taking things apart and leaking oil.

Thanks!
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Old 02-16-2010, 05:29 PM   #2 (permalink)
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Quote:
Originally Posted by DesertRage View Post
Can any verify what thread is in the side of the allison transmission? I am talking about the female thread that the quick disconnect adapter is threaded into on the transmission housing.

I would like to remove the adapter and connect directly to the trans with a JIC style fitting. A trans shop told me it was either a -10 or -12 orb fitting, but they were not sure which. For reference a -10 has a 7/8-10 thread and a -12 is 1 1/16-12. I measured the hex flats on the adapter and they are 1 1/4. I would like to get all the parts before I start taking things apart and leaking oil.

Thanks!
The fittings are a straight thread o-ring fitting.
The 2001 and 2002's used 3/4-16
Starting shortly into 2003 this was increased to 7/8-14
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Old 02-16-2010, 05:35 PM   #3 (permalink)
DesertRage
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Quote:
Originally Posted by Crafty1 View Post
The fittings are a straight thread o-ring fitting.
The 2001 and 2002's used 3/4-16
Starting shortly into 2003 this was increased to 7/8-14
I have called numerous Allison service shops and no one could begin to tell me what they were.

Does the 7/8-14 carry through to the six speeds?

Thanks Crafty! I really appreciate it.
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Old 02-16-2010, 09:48 PM   #4 (permalink)
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Originally Posted by DesertRage View Post
I have called numerous Allison service shops and no one could begin to tell me what they were.

Does the 7/8-14 carry through to the six speeds?

Thanks Crafty! I really appreciate it.
Yes, 7/8-14 thread was used from 2003 up to present.

You can get straight thread o-ring fittings to adapt to AN- flare or pipe, whatever suits your mods.
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Old 02-16-2010, 09:50 PM   #5 (permalink)
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Crafty1 isn't your average service guy and he comes here and shares his knowledge. The 7/8-14 thread is used on the 6 speeds as well.
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Old 02-16-2010, 10:00 PM   #6 (permalink)
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Crafty1 isn't your average service guy and he comes here and shares his knowledge. The 7/8-14 thread is used on the 6 speeds as well.
Thanks Diesel Tech, can't wait til some of you get your hands on the 2011 Allison behind the LML and put it to the test.

The 2009's got the converter housing improvements early and yes, they use the same thread for the cooler ports...
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Old 02-16-2010, 10:00 PM   #7 (permalink)
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How big are the OEM cooler lines?
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Old 02-16-2010, 10:03 PM   #8 (permalink)
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Originally Posted by wreedLBZ View Post
How big are the OEM cooler lines?
1/2" steel, 5/8" rubber.
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Old 02-16-2010, 10:04 PM   #9 (permalink)
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Thx
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Old 02-18-2010, 05:42 AM   #10 (permalink)
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Quote:
Originally Posted by Crafty1 View Post
1/2" steel, 5/8" rubber.
With all the reading on the tranny lines leaking, shouldn't the ID be 5/8?
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