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Voice/Data Guru
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Finally got the code for my SG to read Trans temp, What is the normal operating temp for a 4R70W:confused: Thanks in advance
 

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Oh, 150° to 200° on the high end. I only saw 200° once when I was running at zMax and the car was just sitting there cooking in the July heat after running. When I drove it home the night that you came down to watch the temp dropped to around 150°.

You should have no problem with high temps with the trans cooler that you have.
 

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Mine runs 175 to 190 in the summer when warmed up. It gets hottest on a road trip. I was hitting 200 pulling my 3500 lb boat/trailer when it was 90+ outside, but it was only near the end of the 10 miles to the lake. Sold the boat last May, so don't need to worry about that any more.
 

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1997 Thunderbird 4.6, 1998 Mark VIII LSC
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Since I put my cooler in I see 165 to 185, depending on speed and ambient temperature. Average is around 170.
 
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