Join Date: Aug 2006
Location: Mayberry, NC
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Yeah, 230 is to hot and damage was being done. If you are lucky the only damage will be to the fluid which I would be changing or at least send a sample to Blackstone. But now you have to ask why did it spike this high? My guess is your bypass line is stuck part of the way, or all the way open. Look on the pass side of the trans, you will see two metallic lines coming out of the trans. The front line is going to the trans cooler and the rear is coming back from the cooler. You will also see a line at the trans that coneects the front and rear lines. This is your bypass line, if enough pressure is sensed on the front line the valve will open and the fluid will flow back into the trans without going through the cooler. These pressure valves can fail and your temps spike because the fluid isn't being cooled through the cooler. Easy way to tell if this is your issue is get the trans up to normal temp, grab the bypass line with your bare hand. If it is to hot to grab you have a bad bypass valve. The valve and line are easy to replace for around $60. Dieselsite also sells a kit to eliminate this line, but I don't recommend using it.
If you are wanting to have increased trans cooling most will say to use the 6.0 cooler. This is a great recommendation, my temps have dropped a solid 40 degrees after installing my 6.0 cooler many years ago before it was the " mod to do" . But before the 6.0 cooler the thing to do is use the cooler out of the V10. It is between the 7.3 cooler and the 6.0 and it provides enough cooling to work for 98% of the users. I use to get stacks of the 6.0 coolers new in the box for $60 each back in 04 when the recalss were going on and every Ford dealer had stacks of these coolers laying around. But not any more, they now fetch a tidy sum now.
If I were you I would first figure out what caused your temps to spike. My bet is bypass line, but could be a bad gauge, bad ground or other issue. Then do a complete trans fluid flush. I have posted the " how to" on here multiple times. If you can't find it any where PM me and I will send it to you. Bottom line is you should be happy you had the proper gauges to monitor these temps.
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