What threads are the cooler fittings?

THEFERMANATOR

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Feb 16, 2009
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For which trans. I know the cooler ports in the bellhousing are a -8 AN for the 01-early 03 trucks, and -10 an for 03+. Cooler fittings at the radiator and aux cooler varied.
 

Mogman

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May 3, 2020
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Sorry, brain fart it is an 08 6 speed Allison 1000, I need to know what the threads in the aluminum case are so I can remove the fittings that use the clips and replace them with 5/8 JIC or 10-AN for you aircraft nuts.
 

Mike L.

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Aug 12, 2006
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Sorry, brain fart it is an 08 6 speed Allison 1000, I need to know what the threads in the aluminum case are so I can remove the fittings that use the clips and replace them with 5/8 JIC or 10-AN for you aircraft nuts.
7/8 by 16
 
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THEFERMANATOR

LEGALLY INSANE
Feb 16, 2009
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Yes, it's a -10 with an o-ring where the fitting goes into the case iirc. Just make sure and use a hose that can handle the heat. I used some 275 degree rated hose on mine and they kept leaking from the heat breaking the hose down everytime I towed something. Ended up going with some 325 degree rated hose.
 

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