Ford AOD cooling line thread size

[IC2]

Dave i believe the only boxes that use 1/8" NPT is the Torqueflite & the Powerglide.

Steve - My two C4's have 1/8NPT. I even had to buy a new tap to chase them as all my NPT's were 3/8 and up. But, like I said above, Ford made lots of interesting parts in the '60 through the '80s.

[roadster32]

Dave i've worked with C4's all my life but never seen one with 1/8" NPT threads.

Steve - My two C4's have 1/8NPT. I even had to buy a new tap to chase them as all my NPT's were 3/8 and up. But, like I said above, Ford made lots of interesting parts in the '60 through the '80s.

[IC2]

Dave i've worked with C4's all my life but never seen one with 1/8" NPT threads.

Oh well - no big deal. If the OP can use a 1/4" NPT to chase the threads, then the 1/8"NPT will just rattle in the hole or the 1/4" wont fit if it's the other way

And as far as C4's yep, had a few apart myself

[IC2]

Dave i've worked with C4's all my life but never seen one with 1/8" NPT threads.

Steve - this is my 1/8-27npt purchased especially for chasing C4 cooling lines and used for a total of 4 holes on currently owned transmissions: