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First off do it your self cause otherwise that means your gonna drive to a shop unless you have it towed.
Second there is no brake activated pump in these transmissions!
Its actually quite easy to do flush at home a helper is of great help though.
From what I can find the lower cooler line from the transmission is your Pressurized line going out from the tranny to the cooler.
So remove the top line from the radiator which is the return line to the tranny(make sure the line you remove from the rad is the top line at the transmission). attach a piece of hose onto a spare short piece of line or the appropriate fitting to install in your rad where the return to tranny line goes, and run it into a bucket(preferably white) Remove the transmission pan, install new filter, clean and reinstall the pan with new gasket and torque the transmission bolts to 13ft lbs. refill tranny with 4 qts of fluid.
Get a funnel that will fit nicely into your transmission fill tube and secure it so that it will stay with out having to hold it. I used electrical tape and wrapped it around both so it wouldn't move.
Now with the vehicle in neutral and the wheels chocked. Have another 6 qts of transmission fluid ready, its a lot easier to use 1 qt bottles.
In neutral have your assistant start the vehicle, and watch the bucket to see the transmission fluid coming out of the return line into the bucket. As the fluid is pumped into the bucket simply add the same amount into the fill tube with your 1 qt bottles. Continue to do this until the fluid coming out of the return line is clean red. Then have your helper shut off the vehicle.
Simply reinstall the cooler line and ensure that the transmission is at the correct fluid level in park while idling.
So you have filled the transmission with new fluid and filter this will be sucked up and pushed through the transmission and through the pressure line to the rad and will be pushed through the rad and out through your rigged up line into a bucket. there by pushing new fluid through pretty much the entire system of your transmission.
This is exactly what you will receive at the speedy lube shop. but a whole lot cheaper.
The trick is to keep adding fluid as the transmission is sucking it out of the pan so that it does not run dry as you are exiting the return line into a bucket instead of allowing it to return to the transmission like it normally would.
It is how ever pointless to do this until changing out your rad if your radiator is the source of the problem.
If I needed a new radiator. Wouldnt the truck be overheating? I think the radiator is fine??
Thanks do you have a picture of where to put the new fluid?
Not necessarily. Has the amount of antifreeze in the coolant bottle gone down any?
It could just be leaking from the rad into the transmission cooler area.
I think this might help. When we are talking lower and upper lines this is what we are referring to.
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They are 2 metal lines that come out of the passenger side of the transmission above the pan and run forward beside the engine oil pan and then up and into the passenger side of the radiator. Most folks install another separate cooler inline just like in the picture. You may or may not have this extra cooler.
Any ways when under the transmission and looking up at where the cooler lines enter the transmission. The upper one is the cooled fluid returning to the transmission and the lower one is the hot fluid being pumped out to the cooler.
Also notice that the hot lower line is now the upper line at the rad. well its not really it is actually the stock cooled return line being routed to the extra cooler in front of the rad. This is why it is important to follow the lines up to rad and ensure that the one you remove from the rad is indeed the cooled return line
Yeah you're right! I'll double check underneath like you said! Thanks!OK well I guess youll find out soon enough if it is the rad.
Well I have seen funny things over the years so I don't want to tell you its this one or that and end up being wrong because somebody rednecked it.
It should be the top one at the radiator as well. But! make sure it is by getting down underneath and following the lines up to the front to ensure that the top one at the transmission is the one that you unhook at the rad.