95% of the vehicles I've owned have been manuals, so I've never had to worry about temps. My 92 is an auto and I need to know what temp is considered the safe mark.

 

check your owners manual.

i don't have a trans temp gauge. but i remember seeing the temps in the manual.

 

It's ideal to keep your fluid temps below 175. This will give you the longest life from your ATF. For every 20 degrees above that, the life expectancy of the fluid decreases by 50%. At around 212, varishes can start to form. At 235, seals start to harden, 255 plates slip, above 300 you can get component distortion. (These figures and results were provided by GM, but should be translatable to all makes)
So...keeping it under 200 should be a goal. A good ATF can help the situation by reducing operatiing temps anywhere from 15 to 30 degrees
Heath

 

Just don't get AMSoil. I hear that their fluid catches fire at 156 degrees and explodes at 211...

 

Actually those figures arent so for the Allison. 190-200 is normal daily driving and 220 can be easily seen. The new fluid and clutch technology have made these trannies a lot tougher.

 

Now thats funny right there I dont care who you are!!!

 

Mine only lit up once and it's easily extinguishable

 

Alot can play into where the sender is located. IE: in the pan vs. in the hot line. 220* in the pan can be quite a bit more in the hot line.

 

I'll second that one. I prefer hot line temps....I don't really want to know how hot the oil in the pan is. What i care about is the heat generated by the transmission, right at the hot line start. And those numbers Heath gave are pretty much what Bill, my builder, told me as well, and ones that i live by. At 180 I take measures to stop the climb and at 220 I'm shuttin it down if it goes that far. Driving in lock-up cools the trans a lot faster than running it at idle or out of lock-up if it's been heated out of lock-up. Yours being a 92 won't have lock-up unless you've converted it, so shutting it down is the quickest way to cool it.

 

ok now what line is the hot line the one to the back of the motor or the tail shaft and were can you find a sending unit for it i have a 91 d350 with a 727 trans