Im pulling my trans next weekend for a rebuild since its toasted right now. My question is how do I go about trying to remove the junk if any out of the transmission coolers? I would hate to ruin my rebuild.
You'll need a fluid pump of some sort, and pump a cleaning/flushing solvent through the one in the radiator and lines. I would replace the oil-to-air cooler.
I appreciate the help sir. Do you think if I filled the lines and coolers snd blew them out with air a few times that it would do ok? I have zero experience with this.
It really depends on how the original trans failed.
If it failed hard parts, like there was metal in the oil or the pan flushing is critical. If it was a clutch failure or seal failure it's not AS critical but still important.
A reman transmission comes with a new oil to air cooler for what it's worth.
I would use brake cleaner and pressurized air to clean it, then maybe pump a couple quarts of ATF through your cooler circuit.
If it's a hard part failure there's pieces of it through the entire cooling circuit. Stacked plate coolers are incredibly hard to clean and you really have no assurance that you got all the junk out of it.
New cooler is CHEAP, vs rebuilding the transmission again, is the way FoMoCo looks at it.
For metal contamination failures, I used to completely delete the radiator cooler, or recommend replacement of the radiator.
Ford used to tell you to put a filter in line with the cooler circuit, if I recall rightly the idea was to run it for awhile then get rid of it. Problem was nobody ever remembered to take the goddamn things off so they'd plug up and cause more issues.