01 Ex tranny help please

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Aug 19, 2009 | 09:50 AM

maddog9m

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01 Ex tranny help please

I have an 01 Ex that had a plugged bypass filter. Was just driving and tranny started to flash on column and then overheated. I quickly drained TRANNY FLUID AND FLUSHED torque converter. I replaced cooler and blew all lines out to check for plugs. I also did bypass test to make sure I had good flow. The tranny now gets hot I remember seeing temps of 174 degrees when on highway but now on short 30 mile trips my temps climb into the 250- 260 range. I will tell you that the tranny shifts fine no slipping or anything on short trips but temps climb. I am at a loss as to what else could be wrong and why the overheating. Please any help would be greatly apreciated as I'm up here in upstate NY and my other vehicals are all in Florida. Please any suggestions would be great. Thanks.

Aug 19, 2009 | 09:55 AM

krewat

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Do you have the small bypass valve between the inlet and outlet lines for the tranny cooler lines? If the bypass is stuck open, it won't run the fluid through the cooler.

Aug 19, 2009 | 10:34 AM

maddog9m

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Yes I replaced it with a new OEM from Ford. The old one had a diamond shape piece of aluminium stuck just right in the valve where the normal wearing metal of the tranny got plugged. This was the intial cause of overheating I believe. I was driving and the tranny just made a bump noise and the shifter lever started flashing. It then proceded to overheat temps around 303 degrees and spit out tranny fluid from the seal. I trained it within 1hr of this and replaced bypass,fluid,and cooler with new. It shifts normal but runs way too hot I haven't let it get over 260 degrees before I shut her down and let her cool,I can then resume driving until it happens again. I could understand if my tranny was slipping but I'm watching output shaft spped and torque slippage and everything seems fine.

Aug 19, 2009 | 02:23 PM

krewat

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Any chance the cooler is clogged?

Aug 20, 2009 | 10:12 AM

maddog9m

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No chance I replaced the old one which wasn't blocked and installed a new one which I just flow tested and is not blocked. I was wondering if that control pack inside tranny could cause overheating? Thanks for at least answering me

Aug 20, 2009 | 01:21 PM

krewat

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Since the X is the same tranny (and basically everything else) as the Superduty, you might get more traction asking this in the Superduty forum.

If you do, post a new thread, and put in a link to this thread.

If it's performing normally, the solenoids inside the tranny are probably not the problem. It could be, but I don't think so.

The only things I can think of are slipping clutches, and cooling problems.

Aug 20, 2009 | 02:07 PM

Mark Kovalsky

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From: SE Florida

One thing I recommend is to run a cooler flow test.

Disconnect the cooler line where it attaches to the rear of the trans. Aim the line into a bucket. Have a second bucket ready. Have someone else start the truck. Let it idle in park. When the stream coming out of the line is steady move the line to the second bucket for exactly 15 seconds then move it back to the first bucket and then shut the engine off. If there is at least a quart in the second bucket it passes. If fluid comes spewing out of the transmission where you removed the line it fails.

Spewing fluid or less than a quart indicates low or no flow to the coolers. It could be a pinched line, a plugged cooler, or a stuck bypass valve.