Originally Posted by Max Freedom
I don't have a transmission gage....
Then I'm surprised your 4R100 is still in one piece if you tow more than a rowboat.
Heat is the tranny killer. When towing with your stock tranny cooler setup, you can easily overheat the tranny under extreme conditions. Such as towing up a slow mountain pass at less than 40 MPH. Backing a trailer up a grade. Even stop-and-go traffic through a big city, especially if you get in a traffic jam where you are more stopped than go.
You need a good tranny temp gauge with the sender installed in the pressure port on the driver's side of the tranny. Then if you ever see over 210°, you need more tranny cooling. Don't allow more than 225° tranny temp if you're not ready to buy a rebuilt tranny yet.
Don't all vehicles with tow packages have oversized transmission coolers factory installed?
Your 2000 X-Car with V-10 engine has a bigger than normal oil-to-air (OTA) tranny cooler, but it's not big enough for towing in extreme conditions. I don't know about the V-10, but for the 2000 diesels Ford added an oil-to-water (OTW) tranny cooler beginning with February 2000 production. If your X has that OTW cooler in addition to the V-10 OTA cooler, then you may never see over 210° tranny temp. But if you don't have the OTW cooler you need to watch the tranny temp closely when towing, especially when when towing at less than highway speeds. If you ever see over 210°, then order a new
OTW tranny cooler for a 6.0L diesel. About $300 from www.Tousleyfordparts.com
. It's a bolt on mod that will solve your tranny cooling problems. DO NOT
buy a used OTA tranny cooler from anybody - it may sound like a bargain compared to $300 for a new one, but it will probably trash your tranny.