[01bluegrass]

Just installed new pyro, trans. temp, and boost guages on my 95 F-250. Started driving down the road and the trans. temp is pegged out at 250*. It shifts ok and and makes no unusual noises. It gradually rose to 250* after probably 15 min. of normal driving. Does this mean what Im afraid it means or could there be any other reason for the high temps? What is normal trans. temp. supposed to be? Thanks.

 

[Tankota]

That's not normal. I'd get another temp tester (they have wireless ones at harbor freight etc etc) and see what if the guage you just put in is faulty.
Where did you install the sending unit?
Most mount them in that spot already tapped just above the pan but still in the pan fluid.

Also, I've had my tranny heat up that quick but I was towing (GCW 17K) up a steep gravel road going too slow to lock the converter. low range solved my problems with not locking up the torque converter.

PS Temps should be below 200. Mine hasn't been over 180 in a couple years since I figured out that low range trick on steep gravel roads while towing. On the road mine hasn't been over 180 on the pass.

 

[Clete]

250 is high and can be cooled off with a good cooler. I generally run about 80* over ambient temp normal driving. On an 90* day I see temps of about 170*.

Pulling hard 12k 5th wheel camper I see temps of 100* to 110*over ambient temps. On a 90* day I have seen temps set around 200* pulling.

The stock setup runs through the radiator then through the tranny cooler(which if stock is junk). The temps will be cooled down to no less than the radiator temps, example if your transmission fluid temps are 200* running into the radiator and the radiator temps are setting at 180* that is the least temp it will see before going to the cooler, additional cooling is accomplished through the tranny cooler. Which with the stock cooler is not much.

If it were me I would remove the stock cooler get a good stack plate cooler, flush the lines and take a new reading. If temps do not improve your problem may be deeper.

Hope this helps

 

[01bluegrass]

Hope it's just the guage. Thanks for the advice. I'll do a little homework on the problem.

 

[Racer_X]

I agree, the stock cooler was a bad mistake. It's important that you keep the radiator cooler in the circuit. The powerstroke fan clutch uses heat to turn on. You'd be surprised to know how much the converter makes.
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[Joppy]

Mine did the same thing after instaling the trans. temp guage. So I pulled the trans dipstick and it was warm but not hot. So I called the guage company and they had me test the ohms of the sending unit. Turned out the sending unit was bad. They sent me a new sending unit [for free] and all was well in trany temp land.