200-4r transmission cooler line threads?

[techg8]

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]

Personally, I'd just ditch the one in the radiator and add an aftermarket like B&M or Derale; they come with -6 ends already and the one in the rad is p-u-n-y.
As far as the trans fittings: https://www.tciauto.com/cooler-fittings
https://www.summitracing.com/parts/...MIpc-_zMuJ4gIVBiSGCh15tABhEAQYAiABEgLDnPD_BwE

 

[melloelky]

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.

 

[TURNA]

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?

 

[melloelky]

Are you say the trans case itself has -6 AN threads tapped into it?

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]

OK so the factory fitting female end that is screwed into the case is 1/4 in. NPSM?

 

[melloelky]

correct,I'm running these in my 200-4r.they're shown with plastic washers but they came with copper.works for me.
https://www.summitracing.com/parts/rus-640520/reviews/?page=2

 

[DROLDS84]

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

 

[fleming442]

OK so the factory fitting female end that is screwed into the case is 1/4 in. NPSM?

Yeah, should be. If you click the link to the TCI site I put up, almost all the newer GM autos are 1/4" NPSM.

 

[techg8]

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.....