T-350C Torque Converter Overheat - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-23-2014, 08:58 AM
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T-350C Torque Converter Overheat

This is a strange one.

I have a Th350C coupled to a 350 small block. I rebuilt the gearbox myself.

I added a Torque Converter Clutch switch on the dash.

I have driven 2000 odd km's without any problems and the TCC works well engaging at around 70km/h when switched on. The internal pressure switch disengages it automatically at low speeds.

The other day, I was cruising at around 120-140km/h for the longest period yet when suddenly the trans fluid boiled over and squirted out of the filler pipe all over the motor.

Lots of smoke and a bit of fire resulted.

From the paint discolouration it looks like the heat was localised in the Torque Converter.

I have a trans temp gauge and while I was cruising with the TCC on the trans temp was lower than normal (when cruising with it off). This is what I would logically expect as the fliud coupling would not have been generating heat.

I also have a trans cooler in front of the radiator and the ambient air temp was around 10 deg C.

After the boil over I replaced the oil and continued to drive 400km's home... without engaging the TCC!

I was wondering if someone can figure out a possible cause for this. The only logical explanation I can figure out is that the TCC was slipping a bit while I was driving causing excessive heat buildup. But then again, it felt very much like direct drive to me and I am pretty astute with these feels.

Please Help,

T.

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