possible tranny problem?
 

i have 3.55 gears in my truck and whenever i get around 45-55mph the tranny tries to downshift and then it'll go right back. i figured out that this really only happens whenever the trans temp is over 170. so my question is, is there anything wrong with my tranny, anything i can do to keep my trans temp lower?
any help will do thanks

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any ideas on what it could be?

well, ill be the first one to answer.. im sure other guys will chime in.. could be a TC lockup switch.. theres also an APPS noise isolator that BD diesel sells. it fixes RF interference from the APPS circuit, which could be causing your issue.. heres a link to what im talking about.. i think they run like 25 bucks or something like that.. may be a good try.. i think ive seen them on ebay. hope this helps

BD Power - Product: APPS Noise Isolator

170 sounds fine. Trans oil goes from the trans to a heat exchanger. Engine coolant warms the trans oil (upwards of 190*), then it is sent to the cooler at the front to cool down a bit.

Almost sounds like a torque converter lock up issue. Any codes?

I have not checked for any codes. What do yall mean by it could be a lockup switch? What exactly does a lockup switch do? Is it better for it to be locked or unlocked?

Have a look at this:
http://www.tstproducts.com/Torque%20...p%20Switch.pdf

so you guys think that noise issolator could help out my problem?

It could. The rewire is a lot cheaper, and may fix the problem. I would start with that. You may also want to do an APPS reset, and relearn. If you search this site for those two procedures, you'll find a write up.