Ive been having somewhat of the same problem with my 06 2500 HD, how ever mine goes up to 250*. I've checked it with a heat gun & its only showing 186 max but gauge will be around the 250 range.
Most people said it was the interal harness.. Swapped it out with a OEM from GM & it doing the same thing. Check volts & ohms to & from everything & its still showing trams temp sensor is bad..
Haven't got around to replacing it again.
slowly getting somewhere, 12.75 @ 105 1.77 60', 414rwhp/417rwtq
the trans is brand new not even 100 miles on it and i would say average temp is 210 and thats bi passed the radiator even with the 60 and 3200 it went up to 180-200 no problem
Hand p&p heads, 219-227 .607 .613, pacesetter, tbss intake, 92mm t-body, cai, e-fans, 14 bolt, 4.56, true trac, pi 2800, 33's, 4l80e built by me
In the makin
Boost.
Take a peek..
http://www.performancetrucks.net/for...-275deg-488953
slowly getting somewhere, 12.75 @ 105 1.77 60', 414rwhp/417rwtq
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