Transmission is over heating

[rjfguitar]

[ QUOTE ]
Not sure where the sending unit is, but i'll try and locate it, i checked the fluid and it is still a nice clean pink/red color with no odor. I'll post up in a bit with some more info.

[/ QUOTE ] IF the fluid is still cherry red and doesn't smell burnt than you didn't hit 350*

 

[crazy427]

I never worried about my tranny temp until i put a guage in. Always worked great but i wanted to play and put in a guage . ( thought it would look cool ) after it was installed i noticed that the trans temp would run in the 210 to 230 range on the high way. The longer i drove the hotter it would get. Now it still worked fine ,same as before the guage but that temp bothered me. So i looked in to the whole lock up situation and low and behold mine was not working. So what i did is i installed a new lock-up switch in the trans (2 wire design) and ran them 2 the plug inside the pan.I the wired up the ground and ran the power to a swich on the dash board. so now when im on the high way i just flip lock-up on, when im getting off the highway i shut it off. the amazing thing is now my tranny temp doesnt get over 160 deg. and even better my engine is running about 5-10 deg cooler 2. now the only thing that i did was hook up lock-up so i can say that it ia way more than a 20 deg difference...

 

[Blue85]

I had lockup stop working once and my tranny temps went up to 250 in no time. It would have gone higher if I hadn't downshifted to 3rd gear. Normally it stays down by 160. Running O/D on a 700 without lockup is bad. So what if JET says 20* difference? What vehicle setup is that? You have to know weight of the vehicle, engine load, stall speed, etc., to estimate the extra heat produced. Then you have to look at the cooling system(s) in place to figure what temperature rise that translates into.

My guess is that the original poster's gauge is bad or that it is picking up heat from the headers or catalytic converter. The sender is a variable resistor. Any extra resistance in the ground of the sender translates to errors in the meausurement. Where is the sender mounted? How is that part grounded?