I wonder what temp the fluid would have to get to boil in the tranny like mine did?

 

How do you know it was boiling?

 

Was the tranny temp light on??????

 

I cooked an Allison Tranny on one of the fleet trucks once. From red to silver goop rather quickly. I dont know how hot it got but it had to be pretty darn hot. I think it skipped right past boiling and went straight to cooked Funny thing about it is, there was a couple of days worth of mail stacked on the supervisors desk and it turns out there was a letter in the stack from the dealer regarding a recall for that transmission

 

Yes temp light was on it had came on several times. When it came on I called the dealer and they kept asking if there were any codes I sad no. They then told me that I had no problem really. I told them this thing is hot all they could say was bring it over.It finally threw a code and 2 seconds later it blew tranny fluid all over the road. You could here the fluid boiling in the tranny.

 

I just got through with a transmission rebuild class at the local collage. This was in a hand out sheet from the teacher. I though it might be helpfull.

An automatic transmission fluid is made to give 100,000 miles of service before oxidation occurs at such a rate that change will be required at normal temperatures.

Normal fluid temperature in transmission to be 175 deg. F.

Rate of oxidation to double for each temperature increase of 20 deg F above normal (175 deg F). As oxidation rate doubles, useful life of fluid is cut in half.

At 175 deg F life is 100,000 miles
At 195 deg F (20 deg above 175) life is 50k miles
At 215 life is 25k miles
At 235 life is 12k
At 255 life is 6,250
At 275 life is 3,000
At 295 life is 1500
At 315 life is 750

At temperatures much above 300 deg F the metals in the transmission will tend to warp, twist etc. high temperatures causes the formation of varnish deposits which impair or pre vent transmission operation.

At a fluid temperature of 415 deg F fluid life is 30 minutes!

Source: Empire Lubricants Inc.
Los Angeles CA

 

Below is a chart I've had for some time showing temp to trans life for you all to keep handy.

 

Thank you very much. I still wonder what the boiling point was.