If you race a Ford C-6, C-4 or GM TH-350, 400 or PG then you know the hassle of trying to adapt AN hose to the cooler fittings on the case.
Many shops will tell you 1/8 or 1/4 NPT will work but in reality, the case requires a special NPS straight thread with o-ring.
Each fitting is made to milspecs from aerospace grade material.It is then black anodized for corrosion resistance.
Available in -6 AN size with 1/4 NPS thread or 1/8 NPS thread.
Measuring your Case Fittings
You will need to remove one of the stock cooler line fittings from the case and measure the outside diameter of the threads.
If you do not have the stock fittings, you will need to measure the I.D. of the tapped hole in the case.
1/4" will measure 17/32" or .540" and 1/8" will measure 13/32" or .410".
Most GM Transmissions use 1/4", Fords can be 1/4" or 1/8" and Mopars are 1/8".
