Can the trans fluid run to cold?

[volvoman]

I like thinking that over kill on the trans cooler is good. I was looking at the B&M trans cooler that is supose to be for 28,000 GVW. Is it bad to cool off the fluid too much?

Thanks for any info

Chris

 

[Mark E.]

I asked Bruce the same question when I picked up my trans. He said as cool as possible.

 

[HOTTOGO]

Originally posted by WE4
Strengthening a 2004R

*Most failures in a 2004R are directly related to three things or three categories:

1) HOT TEMPERATURE KILLS:
Do all you can to keep fluid as cool as possible. Higher stall converters produce more heat so they need more cooling. Biggest cooler that can be installed , should be installed.

2) PRESSURE AND HYDRAULIC CONTROL:
Keep well serviced and valve body modifications (i.e., shift kit) should be installed in any 2004R. The level of control (pressures and line) depends on engine output and driveabiliy options.

3) MECHANICAL LOAD AND FATIGUE:
OK, Someone is always gonna say "Well, that's not how my buddies broke" or " I've never seen one break". So we'll talk in "Tendencies". As we work on and test more 2004R's than most and get more tech calls or e-mails for 2004R's than most, I can tell you, for sure, what "tends" to fail and as to, why. I don't want this to be an advertisement, but I do want you all to know how and why, what parts work and what things do not.

 

[chris718]

in my test car i stacked an extra cooler in the best possible path of moving air on top of the original and learned two things
;one is when the vehile was at its usual operating temp trans oil temp only went down 5 degrees and two with the same ambient temp the car took 2 minutes longer in park to reach operating temp.i thought it would be alot more of a drop.this got me so mad that i removed the cooler and now put the temp gauge sensor on the "from cooler"line at the case ,instead of the reservoir and found the temp had dropped 20 degrees .then i put the other cooler back on and it dropped another ten degrees.what does mean?that going from the stock radiator integral cooler to a double one can reduce oil temp over 40 degrees.as for too much cooling ithink its safe to say that the only way it would be bad was if we installed a cooler the size of the engine coollant radiator. i honestly dont know how my data would change if i was in a colder climate.but i can speculate ,however that wouldnt be 100 percent guaranteed info like the cooler episode. dont hook your trans gage to the oil pan reservoir or you wont be able to see what the cooler is doing

 

[b231v6]

According to my builder--Canadian police or mounties or what ever their called had problems with coolers. They ordered cars with transmission coolers on their police package. The problem was that when it was extemely cold,an officer would jump into his car with the tranny fluid cold and would damage the tranny. That of course probably when it's 40 below. I can see how it could happen,but not on a car like a GN. Because,I don't think anyone who owns one on GN would just start and go on minus 1 degree day let alone 40 below.
When the temp sending unit is installed in the pan would'nt you get a more true idea of the temp. as the transmission as a whole? What I mean,is if your converter fluid is overly hot it should'nt take to long for it to show up in the pan temp or should it. Thanks!!

 

[HOTTOGO]

Cooler return line is the best point to check trans temp, try a search on here it has been thourghly discussed.

 

[b231v6]

I had a discussion with Eric from Dynotech he basically said on a street car you would get the actual tranny temp from sending unit in the pan. If the cooler gets plugged or whatever, you will see heat increase in the pan fairly quickly.