The Rodding Roundtable
Motorhead Message Central => Rodder's Roundtable => Topic started by: flt-blk on January 05, 2005, 12:08:25 PM
I have a bare TH350 and an aftermarket transmission cooler. The
transmission doesn't even have fittings on the in and out lines.
Question:
What type of pressure comes out of the transmission? Do I need to use hard line or can I use soft line in and out of the cooler?
Big Olds has a 400TH and has a soft line.
Quote from: "flt-blk"I have a bare TH350 and an aftermarket transmission cooler. The
transmission doesn't even have fittings on the in and out lines.
Question:
What type of pressure comes out of the transmission? Do I need to use hard line or can I use soft line in and out of the cooler?
Depends on your comfort level. Also what does the cooler take? When I first put my cpe together it was hardlined from tranny to radiator. Now I've got a cooler back near the rear-end and it has barb fittings so it's hardlined to the cooler then a short piece of rubber hose connecting them. The more hardline the less trouble your apt too have down the road. My .02
The pressure isn't the only thing to be concerned about. That fluid can be very hot. There are rubber lines up to the task and gas line isn't one of them. A good parts store can point you towards a product that is up to the application but it's more than what you have laying around. GPster
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There isnt much pressure in the trans cooler lines (at least on the chevy stuff Ive messed with) it flows through the cooler then dumps back in to the pan. Unless your return line is restricted its pretty low pressure.
BUT , like mentioned its hot stuff and it is flamable too. Id do it in as much hard line as you could. if it was me.
Doug
depending on a variety of things...
if the tranny has a shift improvement kit , engine vacuum , easy throttle or hard throttle....
Coooler line pressure runs from 20 to 60 psi
It's a stock transmission, and hopefully only in the car for a year until I
get the big motor built with a 5sp.
It looks like I should hard line it to the cooler with a short length of soft line to prevent vibration damage to the cooler. I will be careful on my selection of hi-temp hose too.
Thanks for all the input.
TZ
Quote from: "flt-blk"It's a stock transmission, and hopefully only in the car for a year until I
get the big motor built with a 5sp.
It looks like I should hard line it to the cooler with a short length of soft line to prevent vibration damage to the cooler. I will be careful on my selection of hi-temp hose too.
Thanks for all the input.
TZ
I did my 32 with braided stainless lines but the cooler is close to the tranny. I did a lot of planning on a mount and stuff before i did it and it seems to work fine. I do have exhaust running parallel with the cooler so I made a heat shield out of 1/8 aluminum plate to go behind the cooler..
Dave
Quote from: "flt-blk"It's a stock transmission, and hopefully only in the car for a year until I
get the big motor built with a 5sp.
It looks like I should hard line it to the cooler with a short length of soft line to prevent vibration damage to the cooler. I will be careful on my selection of hi-temp hose too.
Thanks for all the input.
TZ
======== most parts stores like Car Quest, NAPA or similar will have a 5/16 inch hydraulic hose.
This hose will take the chemicals in the tranny fluid and the pressure
Quote from: "flt-blk"I have a bare TH350 and an aftermarket transmission cooler. The
transmission doesn't even have fittings on the in and out lines.
Question:
What type of pressure comes out of the transmission? Do I need to use hard line or can I use soft line in and out of the cooler?
A mate of mine just lost a rubber hose on his TH350. Apart from the obvious mess, it damaged the trans, and caused a small fire; a real mess.
If you use rubber hydraulic hose make sure it is the right type, and carefully routed and secured.
BTW the threads on the transmission case are special, parallel type, not tapered.
Personnally, I prefer to run as much of the solid line as possible, with just flexible connection between the vibrating bits and the chassis mounted bits. It is a little more work.
there is a company called "Gotta Show" they make a bunch of products, but I have been using their trans cooler line kits, they have steel braided lines with AN fittings (not red or blue) and a short hard line at the trans.
They work great and you can cut to fit.
One thing to remember, rubber is an excellent insulator, so using it will hold heat in until it gets to the cooler. Steel line will disapate a certain amount of heat going and coming .
I have a TH400 in my coupe and used soft Hyd. line to connect my cooler and have had NO problems. Just make sure it's Hyd. line not Fule line.
I am using a GM 4L60E (or whatever it is) tranny from my '95 Z28 donor car. The wrecking yard owner tells me that it can sometimes be bad to run a tranny coooler because the fluid can get TOO cool, which is bad for the tranny.
I was thinking about using a radiator with no internal cooler, and the use a seperate tranny cooler, but do I run the risk of the fluid being too cool? I never heard this before.
Is there a guideline for sizing a tranny cooler?
Thanks,
Walt
Hey Tyler e-mail me your address and I will send you a pair of fittings for the tranny for hard lines. Eddie_Bell@msn.com.
Quote from: "48builder"I am using a GM 4L60E (or whatever it is) tranny from my '95 Z28 donor car. The wrecking yard owner tells me that it can sometimes be bad to run a tranny coooler because the fluid can get TOO cool, which is bad for the tranny.
I was thinking about using a radiator with no internal cooler, and the use a seperate tranny cooler, but do I run the risk of the fluid being too cool? I never heard this before.
Is there a guideline for sizing a tranny cooler?
Thanks,
Walt
I put a trans cooler from the shop that my boy works at and I have no cooler in the Griffin rad. this one has a bypass that does not let the fluid go through the cooler till it reaches a temp set point then it will flow into the cooler it is rated for 40,000 gvw
it's a Long Tru-Cool Max model number LPD 4739 13 plates 8.5x22.750x1.250 and good for 40,000 gvw.
The web site selling this same cooler is http://www.bulkpart.com/cgi-bin/miva?
and they are a good company to do business with I bought the detent cable from them at less then half the going price and fast service. Good luck Ed ke6bnl