Transmission Line Question

[broc944]

I have a leak in my rubber line between the radiator and aftermarket transmission cooler. I want to use braided stainless steel lines, but need to figure out the size of fittings I need to order.

The questions I have are:

1. What is the size of the fitting that screws into the radiator?

2. Would -AN6 be the correct size braided line to use for a replacement?

 

[dremu]

I have a leak in my rubber line between the radiator and aftermarket transmission cooler. I want to use braided stainless steel lines, but need to figure out the size of fittings I need to order.

The questions I have are:

1. What is the size of the fitting that screws into the radiator?

2. Would -AN6 be the correct size braided line to use for a replacement?

I *think* the fitting in the radiator is 1/4" NPT... just pulled mine, and it looked like that.

I donno 'bout the line size.

-- A

 

[Slapperbar]

Line size is -6 (3/8"). The fitting is not pipe thread, is is a double flair like brake fittings.

 

[dremu]

Line size is -6 (3/8"). The fitting is not pipe thread, is is a double flair like brake fittings.

I stand corrected. I will be careful with my brass fittings then and not try and put NPT's on there. (Come to think, it looked finer threaded than pipe.)

-- A

 

[Slapperbar]

I think you'd need a 5/16" flair to -6 adapter from Earls. Or... you could call Summit and they'll tell you what you need.

 

[ntsqd]

Can also get such an adapter from an industrial hydrualics supplier.

 

[diesel4me]

line size..

MOST tranny lines are 5/16",with fittings that have 1/2"x20 threads...some heavy duty TH400's I've seen used 3/8" lines with 5/8x18 threads..

I hate using plain galvanized steel lines on my tranny lines,they only last a year or two here thanks to road salt eating them..
I'm tempted to have custom hoses made to fit,but I've read that the steel lines themselves act as a cooler,and eliminating them might increase tranny fluid temparature..but leaky steel lines could let the tranny run dry!--dammed if you do,dammed if you dont!..

 

[ntsqd]

Were you thinking of stainless tube vs. rubber?
Stainless is a poor thermal conductor.

While it's true that GM uses steel tube for a PS cooler on later models, I suspect that a small aux cooler would more than offset the difference btwn steel tubes & rubber hoses.

 

[broc944]

Were you thinking of stainless tube vs. rubber?
Stainless is a poor thermal conductor.

While it's true that GM uses steel tube for a PS cooler on later models, I suspect that a small aux cooler would more than offset the difference btwn steel tubes & rubber hoses.

The reason I want braided lines is for protection from vibration. Second time the rubber hoses have started leaking due to vibration.

I hate the hose clamps, and I also do not really care for rubber hoses that attach the cooler to the existing lines and radiator.

Vibration is what causes 90 percent of all the needed repairs I make on my truck. If a hose starts leaking, it is going to be replaced the -AN way from this point on.

 

[70GMC]

yeah you're going to need a 5/16 to -6 adapter like slapperbar said. i have my tranny cooler hooked up with an fittings and braided line. i used a b&m supercooler set up for an fittings, and i used a permacool thermostat