200-4r transmission cooler line threads?

techg8

techg8

Master Mechanic
Feb 29, 2012
467
63
I want to change from solid cooler lines to -AN fittings and braided hose.

Does anyone know offhand the correct threads/sizes?

In the trans case? Or the flare sizes? are they the same in the radiator?

Thanks for any help. Off to scour the internet for answers.....
 
fleming442

fleming442

Geezer
Dec 26, 2013
7,071
113
melloelky

melloelky

Royal Smart Person
Oct 22, 2017
1,372
113
mass
the correct adapter to make this happen is -6 AN to 1/4 in. NPSM Straight Thread NOT npt.that's a common mistake.For the radiator end 1/2" 20 thread with an inverted flare.
 
Last edited:
TURNA

TURNA

Geezer
Jul 24, 2009
8,416
113
Socialist NY
the Transmission Cooler Lines to Case, -6 AN to 1/4 in. NPSM Straight Thread, NOT npt.that's a common mistake.For the radiator end 1/2" 20 thread with an inverted flare.
Are you say the trans case itself has -6 AN threads tapped into it?
 
  • Useful
Reactions: melloelky
melloelky

melloelky

Royal Smart Person
Oct 22, 2017
1,372
113
mass
Are you say the trans case itself has -6 AN threads tapped into it?
:doh:good point,no i should've said the correct adaptor to make this happen is -6 AN to 1/4 in. NPSM Straight Thread
 
TURNA

TURNA

Geezer
Jul 24, 2009
8,416
113
Socialist NY
OK so the factory fitting female end that is screwed into the case is 1/4 in. NPSM?


 
Last edited:
DROLDS84

DROLDS84

Master Mechanic
Feb 15, 2015
323
63
SW Michigan
I had a fan cooled transmission cooler in my Hurst and I remember ordering some special brass fittings like Turnas pic...you can't find them anywhere...went to some special place to get them...would measure for you but transmission is out to get rebuilt
 
techg8

techg8

Master Mechanic
Feb 29, 2012
467
63
Good info guys, thanks.

I just placed an order for adapters, hose ends and hose at Summit. $125ish all told.

I went with 15' of hose, figuring on a maximum of 7ft each hose if I ran from the trans to the frame rail then forward. I would rather have excess than not enough.

IF it could be routed such that the hose follows the original hard line path, one might get away with 5ft each line. This might require 90deg or 45deg fittings.....
 
  • Like
Reactions: TURNA

Please support GBodyForum Sponsors

Classic Truck ConsolesDixie Restoration DepotMike's MontesP-S-TSouthside Machine PerformanceUMI Performance

contact[email protected]for info on becoming a sponsor