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Thread: Allison cooler line fitting sizes?

  1. #1
    Join Date
    Aug 2001
    Location
    Purcellville, VA
    Posts
    100

    Default Allison cooler line fitting sizes?

    Anybody know the thread size for the fittings which enter and exit on the transmission? My cooler upgrade project is not quite the plug and play swap I was hoping for. I'm probably not as clever as Ranch55! I'm thinking of swapping out the cooler lines with some AN-10 fittings/hose for a clean installation.
    Thanx
    2002 Chevy 2500HD LS D/A CC SB 4X4 Summit White Med. Gray Leather, Stretch Tailgate Extender, Kodiak Sidewinder Retracting Steps, PowerGate tailgate lock, Line-X under rail, Lucerix X-Mount Mirrors, American Racing Pythons 16X8 Chrome, Michlein LTx 285 75R 16\'s, Rancho 4.5", Fumoto, Valentine 1

  2. #2
    Join Date
    Mar 2006
    Location
    Phoenix, AZ
    Posts
    144

    Default

    What kind of TOC are you using? I have some custom made fittings for the Jiffy Tite interface.
    Michael 04.5 SRW LLY

    custom stock intake, upsized boost tubes, Pre-turbo WMI, EFILive custom tune, Aerotech Scan Gauges.

    Go Smokeless!

  3. #3
    Join Date
    Aug 2001
    Location
    Purcellville, VA
    Posts
    100

    Default

    I'm installing a Long H7B with 1/2" NPT fittings on the cooler. No problem there, as the OEM cooler fittings are 1/2" NPT. My difficulty is the hard piped cooling line to the larger cooler places quite a bit of side stress on the connections unless I tilt the cooler at a 45 degree angle. I don't like that option. So I thought I would just replace both cooler lines back to the transmission. I have not disconnected and un-threaded the fittings at the transmiision yet. That's the thread size location I'm interested in. I'll take it apart in the morning and figure it out. I was hoping someone would know and save me a little time and effort.
    Thanx for the reply
    2002 Chevy 2500HD LS D/A CC SB 4X4 Summit White Med. Gray Leather, Stretch Tailgate Extender, Kodiak Sidewinder Retracting Steps, PowerGate tailgate lock, Line-X under rail, Lucerix X-Mount Mirrors, American Racing Pythons 16X8 Chrome, Michlein LTx 285 75R 16\'s, Rancho 4.5", Fumoto, Valentine 1

  4. #4
    Join Date
    Mar 2006
    Location
    Phoenix, AZ
    Posts
    144

    Default

    Quote Originally Posted by pushpole View Post
    I was hoping someone would know and save me a little time and effort.
    Thanx for the reply

    Use a setrab 920. Goes right in place as long as you can fab some brackets. The lines line up perfectly

    Having to replace transmission lines, sounds like a bummer, when I assume you wanted to save money.
    Michael 04.5 SRW LLY

    custom stock intake, upsized boost tubes, Pre-turbo WMI, EFILive custom tune, Aerotech Scan Gauges.

    Go Smokeless!

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