[briann]

Ive been told you have to use the "special" brass fitting with the seal washer on it or the fitting will leak. I would think a 1/4 pipe AN fitting should be leak proof or am I missing something here? My tranny im putting in doesn't have the fittings there so I was just gonna screw the 1/4 pipe AN right into the case to run my braided hose off of or do I need to use the standard brass 1/4 pipe inverted flare fitting with seal washer with a flare to AN adapter off it?

[Rugratman]

I went to NAPA and got 5/16 brake line, it has a fitting on each end, I cut it in half, using a tube bender, bent them the way I wanted them, out of the way of the headers, aiming up a bit. I flared the ends, very slightly, then slid the 6AN line over the ends and clamped them. Works like a charm.

[TTS]

I use pipe dope on 400 case fittings. It's been so long since I started doing it, I don't remember why . I'll take a look today and see.

[75TA]

briann,

You do not need the special fittings unless you plan to use the stock lines - yes use tape dope. I have done exactly what you plan to do. Note that you need to move the AN fittings out some or you may not be able to tighten the fittings with the trans in the car. I have CSR super trans shield also.

[briann]

The pipe "dope" ive used in the past is APR teflon paste so im assuming this stuff is what most people use. It leaked once on me on some fuel line fittings but I just cranked em down another 1/2 turn into the fuel pump and it was fine.

[75TA]

briann,

I used teflon tape (white in color) - when I get home I will try to take a picture.

[BILTIT]

Paste is better than tape, tape can jam into small spaces which you dont want it to go, paste will usually work its way through.

[RAIV55]

Make sure your TH-400 case has pipe thread. Many of them came with straight thread and required sealing washers on the case fittings.

[blown 68]

pretty sure my th400 has flare fittings, not npt. anyone else have that???? i made braided lines last year, and i don't recall any npt anywhere...............

davey

[BILTIT]

The flare fittings should thread out, i cannot see them casting/machining flares into the casing.

[briann]

All turbo 400 cases should have 1/4 pipe thread according to info ive seen (whether that is NPT 1/4 or straight thread I don't know if there is a difference). The original factory fittings that screw into those 1/4 pipe threads are the ones that have the straight threads with the flare on the inside of them that the stock formed cooler lines attach to.

[RAIV55]

Originally Posted by briann

All turbo 400 cases should have 1/4 pipe thread according to info ive seen (whether that is NPT 1/4 or straight thread I don't know if there is a difference). The original factory fittings that screw into those 1/4 pipe threads are the ones that have the straight threads with the flare on the inside of them that the stock formed cooler lines attach to.

I assume you can tell the difference between 1/4 pipe thread and 1/2x20. Not all TH-400 cases had 1/4 pipe thread, in fact most of them don't.

[briann]

Originally Posted by RAIV55

I assume you can tell the difference between 1/4 pipe thread and 1/2x20. Not all TH-400 cases had 1/4 pipe thread, in fact most of them don't.

Well I can usually tell exact thread sizes just by looking at them, but I never just start hitting a bolt/fitting with an impact gun blindly before finger turning it first. Tranny will be here Monday so Ill just wait before getting any fittings for it till its here.

[RAIV55]

Originally Posted by briann

Well I can usually tell exact thread sizes just by looking at them, but I never just start hitting a bolt/fitting with an impact gun blindly before finger turning it first. Tranny will be here Monday so Ill just wait before getting any fittings for it till its here.

Probably a good idea. Wasn't trying to be a jerk, my intention was to give you a heads up and maybe save a possable headache.

[briann]

Originally Posted by RAIV55

Probably a good idea. Wasn't trying to be a jerk, my intention was to give you a heads up and maybe save a possible headache.

Ive had this car 33 years and still amazes me sometimes I cant remember whats going on with it and other times I run across a bolt in my huge spare parts box and remember what it went to 20 years later. I always had a rule never sell anything you take off a car which in this case I should have never sold all the auto tranny components 5 years ago.

[b-man]

If the original fittings that you removed were each sealed with a copper washer, the trans case has straight threads and not tapered pipe threads.

All the trans cases I have here have straight threads on the trans cooler fittings, I haven't come across one with pipe threads yet.

[briann]

Thanks for the pics. I took the fittings off 6 years ago and pretty sure they had washers on them and they were not pipe thread. When I asked the builder what size the case threads were and was told 1/4 pipe so im just not sure. In a day or so I will see whats going on here size wise.

[75TA]

Well, I must have been lucky as my original fittings off my T400 do not look like those at all - I do not know what the T400 came out of as the trans shop provided the case. They were short with pipe threads on the case side with no copper washers. However, if you have those long fittings, use them and get an AN adapter fitting such as Earl's 991946ERL which is a -6 AN to 1/2 - 20 Fuel Pump fitting. It has the inverted flare.

[b-man]

The fittings pictured came off of a '64 ST300 2-speed. They will interchange directly onto a TH400 if you want to run a bigger 3/8" steel line instead of the 5/16" line that comes on most of them.

I ran 3/8" steel line all the way to and from my cooler. Cheap, clean and reliable just like the way they came from the factory.

[briann]

Well... tranny arrived this morning and they are indeed 1/4 NPT threads.