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[SmokeyWren]

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Question: What is the max SAFE Trans temp and also the max SAFE pre turbo EGT?

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Ford says the max safe tranny temp for your E40D tranny is 221º, but it's okay to let it go a bit higher for a short time so you can top out the pass. That assumes your sender is in the pressure port on the side of the tranny, or in the sump.

So my rule is anything below 200º is hunky dory, 200º to 220º is the PAY ATTENTION zone, and don't let it go over about 225º to 230º.

For normal crusing, even mountain climbing with a heavy trailer at over 40 MPH, you should never see over about 200º to 210º. But slow down to less than 40 MPH while dragging a heavy trailer and the tranny temps can soar.

International engineers told us that you can cruise all day at 1,200º pre-turbo EGT, but don't let it go over 1,250º.

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I'm considering Isspro gauges... any comments?

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I have ISPRO EV gauges. They're great. Regardless of brand, you want clear marking around the tranny temp red line area of 220º to 230º. The ISSPRO EV is the best I've seen for that.

ISSPRO makes three different pyrometers in the EV line. One is not color coded, and two are. If you get a color coded pyrometer, be sure you get the one that's for pre-turbo install. It will have the red line at 1,250º. Apparently, ISSPRO was listening to the International engineers. [img]/ubbthreads/images/graemlins/warmsmile.gif[/img]