trans temp gauge sending unit
12-30-2009, 01:45 PM
#21
I do not believe that the port is a straight thread. I am pretty confident that it is 1/8 27npt if I remember correctly. Ill have to check to confirm this but it is definitely a npt. The reason for this is because the pressure ports in transmissions need to seal and most do not use any sealant. Vince
12-30-2009, 02:26 PM
#22
TECH Senior Member
iTrader: (96)
Join Date: Aug 2007
Location: Turnin' Wrenches Infractions: 005
Posts: 24,240
Likes: 0
Received 81 Likes
on
72 Posts
Ah ha my mistake, I remember that the coolant line threads are not NPT. Now I remember, the coolant fittings are a straight thread. I have heard those will crack by trying to install an NPT. I could tell if I ever pulled my port plug out one day.
12-30-2009, 02:30 PM
#23
TECH Senior Member
iTrader: (96)
Join Date: Aug 2007
Location: Turnin' Wrenches Infractions: 005
Posts: 24,240
Likes: 0
Received 81 Likes
on
72 Posts
Here's an excerpt from an ebay ad:
People have been asking us to run our GM trans fittings in -8AN. Ok, here they are!
-8 x 1/4NPS is the correct size for GM turbo 350, Turbo 400, 700R4, 4L60E and many other GM transmissions. These have a straight thread and seal on the gasket. Unlike a tappered pipe thread these will not crack the case.
They are 1/4 NPS which is a straight thread. I assumed the pressure port was the same bc of the crack case problems.
People have been asking us to run our GM trans fittings in -8AN. Ok, here they are!
-8 x 1/4NPS is the correct size for GM turbo 350, Turbo 400, 700R4, 4L60E and many other GM transmissions. These have a straight thread and seal on the gasket. Unlike a tappered pipe thread these will not crack the case.
They are 1/4 NPS which is a straight thread. I assumed the pressure port was the same bc of the crack case problems.
