TR-6060: stock cooler/radiator fitting sizes?

[TheBrightSide]

Hey guys, posting again to inquire about more specific information on the factory Tremec TR-6060 manual trans, as well as the fittings that go into the trans and radiatior, for the trans oil cooler setup to work. I'm looking to get rid of the stock, factory hard line setup, with the "quick-disconnect" setup that GM uses, with it's wire clips.

After removing the trans from my car for the first time in a long time, and looking over things I could "improve" or make more "efficient"; I found that I didn't really like how the factory GM fittings with the hard lines worked. There's no o-rings, and when the hard lines aren't all mounted up, they flex around and are pretty loose.

They haven't leaked on me at all, although I haven't researched if that is a common occurrence or not. I'd just rather maybe get some braided stainless steel trans cooler lines, with some 90-degree fittings (male to male) to go to the trans, and just regular AN (male to male) fittings to the radiator. I figured I could also potentially sheathe the aftermarket, stainless steel trans cooler lines, with the typical fiberglass or titanium heat-resistant material that I've used before, on things like my aftermarket braided clutch line, for example.

I've looked up some sources and kits, and a lot of them say -6 AN for the "size", but I can't tell what the thread pitch/size are, for the actual threads inside of the transmission and radiator themselves. I got an aftermarket trans cooler line kit, and it has a bunch of male to male -6 AN fittings, but most of them are either 1/4" or 3/8" NPT threaded (going either into trans or radiator).

If anyone knows all of the thread pitch sizes for the trans and radiator trans cooler fittings, please let me know. I would highly appreciate it. When I have time, I will go ahead and just take the fittings out again, from the trans and radiator themselves, to check. I originally assumed they were -6 AN ORB to -6 AN male fitting setups, for going aftermarket.

[TheBrightSide]

I also posted on this LS1 forum, a while ago btw:

https://ls1tech.com/forums/manual-tr...r-lines-2.html

Looks like they just used some -6 AN male to -6 AN male fittings. Not sure if -6 AN ORB male to -6 AN male is any different?

[TheBrightSide]

I hope someone can chime in. I’m about to remove the stock quick disconnect fittings from the transmission, and then the radiator’s trans cooler fittings. I’ve seen sources say that -6 AN male alone will fit the transmission’s threads, and some people say 1/4” NSPT (not lie NPT threads).

Also, the aftermarket trans cooler line kit that I got, had 70” inch lines; so, hopefully it fits and is long enough. I’m probably gonna get one of those metal braces to pair two lines together, and keep them from moving. I’m also debating heat wrapping them, since they’ll still kinda be by the cats

[CamaroCracka]

I used 6an male/6an ORB male fittings when I ran cooler lines to the diffs on both my cars. Same fittings for both trans and the radiator, but on the radiator, the internal cooler is sealed by that fitting so make sure you have it in there right and sealing correctly.

[TheBrightSide]

Originally Posted by CamaroCracka

I used 6an male/6an ORB male fittings when I ran cooler lines to the diffs on both my cars. Same fittings for both trans and the radiator, but on the radiator, the internal cooler is sealed by that fitting so make sure you have it in there right and sealing correctly.

So, on the factory trans cooler, which is hooked up to the stock radiator; it has similar looking -6 AN fittings, but they have that big washer that is on the back of them. Is that what you’re referring to or..?

I haven’t removed any of the fittings off of the trans or radiator, but I’ve been wondering since people ran either -6AN to -6AN (male to male) fittings or -6AN to 1/4” NSPT (male to male). You’re saying -6AN ORB to -6AN (male to male) will also work? Is it the same exact thing for the radiator fittings?

Also, I haven’t mocked up the lines and whatnot, but in the trans cooler line kit I got, it came with some -6AN 90-degree fittings (female to female). I will have to use these 90-degree fittings on top of whichever -6AN ones I thread into the trans. The trans cooler at the radiator will be able to just use the plain, straight -6AN fittings. I will have to figure out those washers though…

[CamaroCracka]

Originally Posted by TheBrightSide

So, on the factory trans cooler, which is hooked up to the stock radiator; it has similar looking -6 AN fittings, but they have that big washer that is on the back of them. Is that what you’re referring to or..?

Correct, but I was never able to find a 6an fitting with that large of a flange. I used the Evil Energy one below, even though I am not fan of their stuff, just because it had a slightly larger flange area.

https://www.amazon.com/dp/B07V27X9SB..._title_16&th=1

Originally Posted by TheBrightSide

I haven’t removed any of the fittings off of the trans or radiator, but I’ve been wondering since people ran either -6AN to -6AN (male to male) fittings or -6AN to 1/4” NSPT (male to male). You’re saying -6AN ORB to -6AN (male to male) will also work? Is it the same exact thing for the radiator fittings?

Yes, I ran -6AN ORB to -6AN (male to male) at the trans and radiator when I put diff cooler lines in on both my cars and none of it leaks. Those fittings are definitely not NPT, but I have seen NPT fittings used in AN-ORB fittings before. Many times they don't leak, but sometimes they do.

Originally Posted by TheBrightSide

Also, I haven’t mocked up the lines and whatnot, but in the trans cooler line kit I got, it came with some -6AN 90-degree fittings (female to female). I will have to use these 90-degree fittings on top of whichever -6AN ones I thread into the trans. The trans cooler at the radiator will be able to just use the plain, straight -6AN fittings. I will have to figure out those washers though…

IIRC, I put a 90 degree hose end on the driver's side of the transmission because of the clearance to the tunnel, but the passenger side is lower and a 90 might give you issues against the bell housing. A 135 degree might work better there, but it's been a few years so I don't recall what I used. I do know that I used straight fittings into the trans and radiator and any bends needed I did with fittings on the hose.

[TheBrightSide]

Originally Posted by CamaroCracka

Correct, but I was never able to find a 6an fitting with that large of a flange. I used the Evil Energy one below, even though I am not fan of their stuff, just because it had a slightly larger flange area.

https://www.amazon.com/dp/B07V27X9SB..._title_16&th=1



Yes, I ran -6AN ORB to -6AN (male to male) at the trans and radiator when I put diff cooler lines in on both my cars and none of it leaks. Those fittings are definitely not NPT, but I have seen NPT fittings used in AN-ORB fittings before. Many times they don't leak, but sometimes they do.



IIRC, I put a 90 degree hose end on the driver's side of the transmission because of the clearance to the tunnel, but the passenger side is lower and a 90 might give you issues against the bell housing. A 135 degree might work better there, but it's been a few years so I don't recall what I used. I do know that I used straight fittings into the trans and radiator and any bends needed I did with fittings on the hose.

Okay, yeah, I got 2 pairs of -6AN ORB male to -6AN male fittings. They came with o-rings and teflon tape that I’ll put on both sides of the threads. Looks like the same size hex as the stock GM quick disconnect style fittings (19mm?).

I’ll probably take off the transmission fittings, fit on the new ones, and then go to the trans and take those off, to see if the same fittings will work. You said that using 90-degree angle (-6AN) fittings on the trans ones, will have issues with clearance? Hmm…. Maybe I’ll find out once I install the trans and try to route up the new -6AN stainless steel braided hoses?

Btw, I haven’t checked, but those those huge washers on the radiator, for the trans cooler fittings, even actually do anything (like help the seal when tightened)? I honestly really just wanted an easier way of messing with the trans cooler lines, if I ever mess with the transmission or have to remove and drop it again. They were in the way, but people told me the bushing would allow them to bend. I capped off the inlet/feed hard line, cause it kept leaking when I removed the line from the trans at first.

Also, do you still have the setup or any photos of it installed? This would really help out a lot of folks, since there’s not much info, and so much conflicting and/or incorrect info. People who mod their cars will definitely love to do this. I wanted to upgrade my radiator to an aftermarket aluminum one, but idk how reliable they are. I see Mishimoto and it’s pretty pricey and I could find a similar aftermarket brand for cheaper.

[CamaroCracka]

Originally Posted by TheBrightSide

They came with o-rings and teflon tape that I’ll put on both sides of the threads.

You should not need teflon tape on AN fittings.

Originally Posted by TheBrightSide

You said that using 90-degree angle (-6AN) fittings on the trans ones, will have issues with clearance?

Only potentially on the passenger side. You need a 90 degree on the driver, but I used a 90 degree hose end rather than a fitting.

Originally Posted by TheBrightSide

Btw, I haven’t checked, but those huge washers on the radiator, for the trans cooler fittings, even actually do anything (like help the seal when tightened)?

I don't see how they could be involved in sealing, but they might provide stability for the fitting.

Originally Posted by TheBrightSide

Also, do you still have the setup or any photos of it installed? This would really help out a lot of folks, since there’s not much info, and so much conflicting and/or incorrect info. People who mod their cars will definitely love to do this. I wanted to upgrade my radiator to an aftermarket aluminum one, but idk how reliable they are. I see Mishimoto and it’s pretty pricey and I could find a similar aftermarket brand for cheaper.

I just installed a custom Champion three row that moved the location of the top hose and cleaned up my turbo install. It was $400 and the fittings worked well on it too.

Here is a pic of the fitting in the radiator and in the driver's side of the trans.

[TheBrightSide]

Since it looks like no one ever goes for a custom trans cooler line setup, I figured I’d finish this topic thread lol. But for anyone still wondering, ALL of the GM quick disconnect fittings on both the trans and stock radiator, are all -6AN thread pitch.

I decided to opt for -6 AN ORB to - 6AN, male to male fittings all around, so that the o-rings could help generate a nice seal when tightened down. I wish I would’ve gotten some stainless steel fittings, but there weren’t a whole lot of -6AN ORB to -6AN (male to male) fittings, except for the more common aluminum ones. If I recall correctly though, there were a couple people who ran the same setup,with non-ORB -6AN male to male fittings, and they didn’t leak.

I ended up adding the 90-degree -6AN fittings (female) for the trans cooler line kit, so hopefully I’ll update this upgrade in the next month or so. For anyone who is curious about -6AN sizing in inches, I believe they came with dust covers in my trans cooler line upgrade kit, that said they were equivalent to 9/16” inches.

But more importantly, the inner diameter (ID) of the new trans cooler fittings, is fairly close to the stock Camaro, GM quick disconnect hard lines; although I don’t know the exact size… I might be able to measure the OD (outer diameter).