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Radiator transmission line thread size

Old Oct 19, 2009 | 02:59 PM
  #1  
wildjyoung's Avatar
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Car: 1991 Trans Am GTA, 2003 Grand Am GT
Engine: 350 Tune Port
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Radiator transmission line thread size

What is the thread size for the transmission cooler lines in the stock radiator? I heard 1/2-11 but that seems odd to me.

Thanks for your help!
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Old Nov 10, 2009 | 08:24 PM
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Car: 1989 Camaro IROC-Z
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Axle/Gears: 9 bolt w/ PBR's
Re: Radiator transmission line thread size

It is 5/16 NPT I believe.
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Old Nov 10, 2009 | 09:13 PM
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Re: Radiator transmission line thread size

5/16 inverted flare.
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Old Nov 10, 2009 | 09:19 PM
  #4  
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Car: 1989 Camaro IROC-Z
Engine: L98 350 TPI
Transmission: Built TH-700 R4 (Vilgilante 2800)
Axle/Gears: 9 bolt w/ PBR's
Re: Radiator transmission line thread size

Originally Posted by one92rs
5/16 inverted flare.
Yeah he is right.
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