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Old 07-03-2007, 01:12 PM   #1 (permalink)
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th400 cooler line size

I searched and couldn't find anything on this...on pirate or google.

What size hard line should I be running to the tranny cooler for my th400. the fittings on the side of it would seem to sugest that it would be a 5/16 line but it seems like a buddy of mines suburban with a th400 had 3/8 line. I don't weant to do anything to choke it out.

Its not a high stall but it does have a full manual VB and red clutches, if it matters.

thanks
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Old 07-03-2007, 02:54 PM   #2 (permalink)
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get the fittings off a caddy th400.

they are 3/8 inch, versus the standard 5/16 inch sizes for most of the rest of em.

dont tap them for NPT, either.
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Old 07-03-2007, 03:14 PM   #3 (permalink)
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I'm just gonna start PMing you with all questions concerning cooler line fittings on a TH400...


thanks
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Old 07-03-2007, 08:32 PM   #4 (permalink)
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Thanks...

I only work here part time. I'm sure someone has a lot more knowledge out there than myself.
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Old 07-05-2007, 12:47 PM   #5 (permalink)
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Try Here http://www.tciauto.com/Products/TechInfo/cooler_fittings.asp[/URL]
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Old 07-05-2007, 09:47 PM   #6 (permalink)
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just so you know.... and to possibly save you some money down the road...

theres a difference between threads. according to the above posted link to TCIauto, which may well be a reputable establishment, and may sell quality parts, be aware that you dont WANT NPT threads, or National Pipe Taper threads on your fittings.

Why?

THEY DONT FIT THE SAME

Look at the photo below, and you can see for yourself. Included is a photo of two fittings. The fitting on the left is the 5/16 fitting out of a th400 case. note the lack of taper on the fittings theads as seen from the side. If you look at the fitting on the right, which is the actual National Pipe Taper thread, you can see the threads taper down which will create a friction fit as well as a friction seal.

To accomplish the same, the fitting on the left uses a crush washer.



buy the right parts, at the right price, no matter who you get em from. Im not bashing any vendor, by the way. I just dont want to see someone get screwed by inappropriate information.

Edit: for more info on tapered thread vs straight thread, read this: http://www.swagelok.com/fittings/flu...akage&301Red=Y
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Last edited by Grumpy_old_fart; 07-05-2007 at 09:55 PM.
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