...and radiator cooler fitting? When I do a search for the transmission quick disconnect I get the EFI tube results. The bulge is more square topped than the transmission lines, which seem triangular topped, if you know what I mean...I'm referring to 3/8" steel tubing...

ALSO:
On 4l60e 2007:

Does anybody know the exact thread in the case and when did it change? I see 9/16-18, 1/4NPT, and 1/4NPS... or 1/4BPSS... or was it 9/16-24?

Thanks.

 

No, the quick connect tool does not work for transmission lines.
The easiest way to remove the lines is to first pull the little W clip out of the fitting. A 90 degree tipp'd pick works great.
Once that clip is out only the O-Ring is holding the line in place. If they've never been removed, they will be a bit stiff so just wiggle and pull and it'll come out

 

Not sure what your question is. Are you asking about converting the trans and radiator cooler line fittings to GM fuel quick disconnect fittings?

 

Maroon and bbond105,

Sorry if I wasn't more clear. I know they sell THIS stub fitting that has the transmission quick disconnect swage like this, a Hayden item::




It snaps into this fitting:


2007+ case fitting...

https://www.ebay.com/itm/223188251920

When I did a search for the tube, I somehow got THIS:


Its name is "-6AN AN6 EFI Fuel Adapter Fitting to 3/8" Male GM Quick Connect LS"
https://www.ebay.com/itm/113858221558

Disregard the lengths, it can be shortened if necessary.

Monster, I have the round metal tool that looks gold anodized aluminum and round like a Packman that opens and goes over the line & gets pushed into the fitting with the e-ring, you twist it and it opens up the clip and you don't even need to remove the clip, you just pull the tube out. This is better than trying to get your hand up in there to fiddle around with the clip!

I got vehicle-less because of a line that was rusty and let go on the interstate and took out 3-4 gears. I have been seriously considering going to SS PTFE hose, I have experience using it and have ordered some cheap stuff, I hope the fittings don't bite me in the *** though.

So I wondered if that last tube could be used in the case & radiator fittings that use the e-clip. I got out of the industry before the EFI fittings came out.

PART 2, I'd like to know the correct thread for the case; this AC-Delco fitting above was advertised as 2007+. My core trans is a 7KCD. That's from the OLD-style Silverado/Sierra 1500, so not sure if it got the new fitting or they used up what they already had.

IF, IF I go SS hose (by the way, the PTFE is rated to 450*F or so) I'd like to extend the hard lines with AN6 male on the end and attach 45- or 90-degree fittings, or even bend up a short piece myself using a 37-degree JIC flare seat and nut. (JIC 37* = AN Fittings, like Earl's & Russell's.) I have a great JIC flare tool somewhere. Maybe lots of fittings too. Not to mention I'll be adding a big cooler too... I'm wondering if there's a pretty clear shot from the fittings to the radiator bottom tank...

 

It already has the quick connect fittings in that year, I was wondering if the quick connect EFI fittings could be use on the trans/radiator.

Post above should be more clear. Thanks.

 

if you want to go to an AN type fitting...why not just skip the middle man of the quick connect, and thread an AN fitting into the case

 

Should be STRAIGHT 1/4" pipe thread; NOT the same thing as 1/4" National Pipe Thread, which has a taper. You can crack the housing if you try to force it in.

Question: Is it feasible to tap the 1/4" Straight pipe threads for conventional NPT? It would really open up a lot more choices on fittings.

 

I want to get the fitting out of that tight area, I can't get my big hands in there, and there's even more shiite with 4WD. I suppose I can go with a female inverted flare fitting too and just bend a line 45 or 90 degrees or whatever angle. They have AN ends that are male or female AN6 and they attach to solid lines instead of hose but one I saw said 250PSI MAX...They literally are a compression fitting on the end that woulda been hose, and AN6 M or F the other end...


I was gonna start a thread if anybody used nickel-copper 3/8" line, likewise if anyone used 90* and 180* Chinese AN fittings. I bought some 45-90-180* hose ends and to cover the bases, maybe put the 180's on the cooler inlet/outlets. I'm not an engineer and don't know what a viscous fluid circulation at 250PSI is like thru hose ends vs forged fittings w/sharp 90* turns.

 

So is that NPS or ??? Are the threads 9/16" diameter?
And what years does it cover? Looking at the AN fittings, I think there are 3 different sets:

• 4L80
• TH350/400/2004R/700/'60/'60E
• LATE 4L60E/65E/70E

I have not removed the stock ones but are they just tightened, or crush washer or ORB (O-Ring Boss?)

Did they change it to metric or something on the later 60 family and others (6-speed, etc?)
Thanks.

 

I used a Aeroquipe swivel fitting on the hose and bought two of the retrofit fittings that are the O-ring pipe style on the trans side and the Aircraft/hydro fitting towards the hose.
I also used -6 hydraulic line. Since Mine was a swap and running metal was going to be a major pain.. I have the same issue tight gap, but the swivel fitting let me move the hose so an end wrench can grab the fitting.

 

Thanks pdx! Do you know what year the trans was from? Was the hose end straight or 90* or something else?

What did you use for a cooler and what fittings?

 

I'm pretty sure 9/16"-18 is the straight thread equivalent of 1/4" pipe straight thread... anybody confirm this?

S3654-6 would be AN6; S3654-86 would be 8AN... (both 9/16-18 O-ring....)

https://www.fairviewfittings.com/pro...c-elbow-83390/

Anybody?

 

2007 ish case, 4l65E I used -6 for all the transmission plumbing, I'm currently running through the radiator cooler tube becaus the cooler I want is back ordered..
I used straight fittings in the trans, they stick out about 1", I used a 90 degree swivel on both fittings I ran the lines level along the engine to the front. UI used -6 adapters in the holes in the radiator as well, got them at a local fluid fitting supplier. all the hose fittings are Stainless and self assembled Aeroquipe style.

But hang on to your wallet, the hose and fittings were $235 for the type I bought, (I used exterior rated hose for tractor and similar hydraulics as its on a well used jeep and I wanted it tough. ) Whatever you do the hose and fittings need to pretty much be the same brand if you are not having a shop crimp assemble them.

BTW a 5 dollar garden hose is perfect for mocking it up so your lengths will work.

Also remember your fitting may be hard to get on, due to clearance, but they get shorter as they thread on. In my case I loosened the transmission cross member with 2 extra long bolts, installed the hoses and replaced the correct bolts. It let the transmission settle lower about 1 inch. by taking 1 bolt out at a time and leaving 1 on each side out it was easy to lower and raise the back of the transmission.

 

Thanks for the tips! I bought Stainless Steel braided hose rated to about 450F, it has a PTFE/Teflon inner core. I used it 25+ years ago with steel fittings, but bought a 7ft section today with these fittings:



There are:

• (1) straight
• (1) 90-degree
• (2) 45-degree
• (2) 180-degree

All 6AN size. It was a broken set, the seller used (1) straight and (1) 90-degree and I assume 3 feet of hose and I got what was left over for $21.87 I think. ($12 + $9.87 Shipping) Actually I forgot the tax, grand total was $23.78. I think it was a steal if nothing's wrong with everything... I didn't figure out which cooler yet, but if the cooler has fittings, and they mount at the top, then I'd use the 180's there and the 45's, or a 45 & a 90, at the trans.

These pics show a similar body style with the trans removed and the angles... of course, heat shield and exhaust aren't shown...



Thanks again pdx!

 

1/4" npt is not the same as 9/16-18. yes they are both 18 tpi, but the diameters are 0.023" difference. if it's calling for straight pipe thread (or NPS) then you need to get the proper NPS tap.

 

I never said it's NPT, I said I think 9/16"-18 is the same as 1/4 STRAIGHT / NPS! Are you saying 9/16-18 = 1/4" NPS?

 

1/4 NPT and NPS are they same thread pitch/diameter, one is tapered the later is not. So no, they are not the same.

 

1/4 NPS and 9/16-18 are both 18 TPI but that's about where the similarities end
pilot hole sizes are different, major diameters are different, etc

you may be able to jam one inside the other but it won't be pretty

 

So Maroon, what is the thread are the TWO different case threads for coolant lines and what year did they change? please let me know. Thanks Monster.

EDIT: I am seeing the 9/16-18 mostly on the radiator end and multiple case fittings, one 1/4 x 18 NPS and another w/o a size mentioned but aluminum at the case. I've also seen at least 2 different clips...

 

I know the 4l80e changed over from 1/4 NPS to 9/16-18 on "11-29-07"
I'm not sure if/when the 4l60e made that change

I don't mean to be rude here but...why not just measure/check your case and go from there to get what you need?