jay104765
stthomas
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I have a 1990 gmc k2500, I am wondering which tranny cooler line at the rad is the return? I want to install a extra tranny cooler. 350ci engine not sure what trans.
thanks
* This post was
edited 10/10/08 08:15am by jay104765 *
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Rolling Condo
South Carolina
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Need to know what your engine and transmission size and type are first. I'd contact a local transmission shop for that information.
'90 GMC R2500 7.4L
'90 Avion 34V
Reese Dual Cam HP
Prodigy
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MAJESTYPOINTERS
MONROE, MI.
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It will not realy mater if you hook to the intake or out take side as long as it is plummed in the cooling system before it gets back to the trans. IE any line is fine. If you realy have to know pull one line off. Disconect power to your engine ignition coil. Place a pan to catch the oil from the line. Crank over motor(it wont start with out power to the coil)and see what way the oil flowes out of the lines....WOLA.....That is the direction of flow.....
Go luck
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smkettner
Southern California
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The return is generally closer to the cool side of the radiator or radiator outlet.
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Rollincool
Always Rollin
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Jay,
You should have the 700R4/4L60 MD8 transmission in that truck. The return line going back to the trans is at the top of the radiator. You want to hook the return line to the trans cooler.
Out of transmission into radiator> out of radiator into cooler> out of cooler back to transmission. Get the BIGGEST cooler you can get. and mount it where it will get good air. DON'T bypass the radiator as it heats up the fluid in the winter months. This one
I suggest you give the transmission a good flush since you overheated the fluid.
It's easy to do on that tranny. Drop the pan, remove the filter. Then cut the neck off the filter, stick one end of the neck you cut off into a hose, the other back into the tranny where the filter goes. Fill up a CLEAN bucket with fluid, stick hose into bucket, start the truck, hold foot on brake and shift from rev to drive while holding foot tightly on brake and push all fluid through til you see good red fluid dropping down into pan.
Oh yeah, make sure you have a BIG catch pan under tranny or you will make a mess! This is usually better when you have someone helping you to keep an eye on things down below.
Install new filter, re-install pan, and add some more fluid after reaching running temp to full mark on stick. After you finish, that trans should shift and run very well. 
Edit: Make sure you change the hoses and flush all lines.
-Joe
* This post was
edited 10/16/08 08:07am by Rollincool *
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tom_kat
way upstate new york/lake george area
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start it up let it run the colder line is the return line the hot one is from the tranny.
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LarryJM
NoVa
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MAJESTYPOINTERS wrote:It will not realy mater if you hook to the intake or out take side as long as it is plummed in the cooling system before it gets back to the trans. IE any line is fine. If you realy have to know pull one line off. Disconect power to your engine ignition coil. Place a pan to catch the oil from the line. Crank over motor(it wont start with out power to the coil)and see what way the oil flowes out of the lines....WOLA.....That is the direction of flow.....
Go luck
I think it matters and you should have the OTW before the OTA. Reason being IMHO is that the OTW has a higher heat transfer rate and the tranny fluid out of the trans can be really hot at times and the bottom of the radiator is fairly consistent in it's temp. Fords with both the OTW and OTA tranny coolers are plumbed this way so my laymans reasons are probably lacking but that's how I see it.
Larry
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Terryallan
NC
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Actually it does matter. It must be after the radiator. The Radiator cools it to a certian temp. It will be that temp going back to the trany IF you put it in front of the radiator
It will be cooler than the radiatior IF you put after the radiator, therefor it will do a better job of cooling the trany. Putting it before the radiator defeats the cooling of the trans cooler, and you simply waste your money, and can burn the trany.
What ever you do. Do not bypass the radiator.
Terry & Shay
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JIMNLIN
Big Cabin, OK
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I have a old '90 chev 2500 2wd with the 5.7 and the 4L60 tranny. I added the biggest cooler (I bought the truck when new) that would fit in front of the radiator, behind the grill. Its plumbed just like Rollincool says. I also use two temp sensors. One in the return line and the other in the pan with both wired to a 3 position switch to one temp gage. Its interesting watching the temp difference in city traffic/etc which can make a big difference in temps.
Jim
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dougsee3
Calgary AB
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It possibly does not make heat sense but the GM trans oil returns from the top of the Rad.
It is possible that this prevents the oil from running back to the trans when you shut the motor off.
* This post was
edited 10/12/08 09:47pm by dougsee3 *
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