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transmission coolers and fitting [message #357326] Wed, 29 July 2020 10:44 Go to previous message
lqqkatjon is currently offline  lqqkatjon   United States
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
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Senior Member
things look to hopefully be coming together to install the turnquist rebuilt transmission into my coach this weekend.

my transmission failure(undetermined why), has a pile of metal in it, so we did not use that one as a core. That also means all my tranny cooler lines and transmission cooler must be full of metal, so I am going to yank that stuff out, and go with 3/8" lines.

I have the straight thread fittings to go into the transmission to go to a 3/8" brake line flared tube. They are striaght and not 45 degree like the OEm, but they should work well.

what i am hoping to do, is to install 3/8" metal lines from the transmission, and go up to the radiator to get as far away from the engine/exhaust as practical. then I have the cooler that uses -6 AN fittings, and I want to utilize -6AN braided hose to go from the metal lines around to the front to wherever I can mount the new transmission cooler.

does anybody have good information or photos of the fittings, or how to convert properly from a flared metal brake line hose, to whatever a -6AN fitting would be?

I have been looking at all the photos I can find. I am hoping to go down saturday morning and drive my coach home, and not find out there are more parts or fittings I need and can't find.


on another note- I am pretty confident in the quality of Steve Turnquist Transmission build. there is some cost involved, but with a custom fully furnace brazed and reinforced torque converter. he also uses some upgraded "forged" rather then cast parts in it, a couple upgraded spags? and does some other things to the transmission to beef it up. I don't have the specific details, but he seems to have a solid track record of building th425 for the gmc motorhome now. I think now 10 that i personally know of are running his transmissions. most of witch are in coaches that run alot of gas through them going all over the USA. he feels pretty confident that I should be able to push this transmission over the same Mt. pass that took out my last one. but I do not plan on trying to prove him wrong! So if anybody is looking for a solid transmission, send me a message and I can put you in touch with him.



Jon Roche 75 palm beach EBL EFI, manny headers, Micro Level, rebuilt most of coach now. St. Cloud, MN http://lqqkatjon.blogspot.com/

[Updated on: Wed, 29 July 2020 10:47]

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