Trans Temp Probe/Run Too Cool?

[RacerDude]

Hi,

Does anyone know where the trans temp probe is on the sealed 5-speed auto? There is an idiot light so I'm assuming there is a probe somewhere. And would it be possible to replace it with an aftermarket sensor to feed signal to an actual gauge.

Also, on another trans subject, if I replace the stock trans cooler with a larger one, is it possible to overcool the fluid in the winter when it's only 10-20 degrees outside. Does anyone know for sure whether the external stock cooler is plumbed before or after the radiator cooler.......if before, I'm assuming the radiator cooler would actually warm the fluid up if the external cooler cooled it too much.

Getting ready for the summer towing season, planning a trip to the Grand Canyon and then over to the California coast via I-40 through the Needles (HOT HOT HOT) area in late July and want to make sure I'm taking care of the trans.

RD

 

[RacerDude]

Just thought I would update this thread with what I've found.

TeryT has a post here
http://www.toyota-4runner.org/showthread.php?s=&threadid=11538&highlight=hayden+526

about a cooler/fan combo that looks really good.

Also, I found this site

http://www.importperformancetrans.com/coolers.shtml#main

that looks like it has good coolers without fans included that have a sort of automatic bypass to avoid over-cooling the fluid. Also what I found interesting was the Autometer sender block for a trans gauge that apparently can be installed inline, eliminating the need to put a hole in your pan or trans.

RD

 

[trd2001]

When you pull the stock cooler, how much fluid will you loose? i want to install a larger cooler, but i am scared of not putting enough fluid back in.

 

[greasefingers]

Search for posts under the user name TeryT. I believe he added a tranny temp sensor.

 

[RacerDude]

TRD2001,

You will lose hardly any fluid at all, mainly just what is actually in the cooler itself.

What I wasn't clear on was whether the engine was supposed to be running to check the fluid with the "check" plug in the transmission pan.

RD

 

[greasefingers]

For those of us with tranny dip-sticks you inspect the AFT level with a hot engine, running, and in Park. But I can see how it is difficult without a dip-stick! You could fill the cooler up, and plug with rubber stoppers, then install. Also catch any AFT that leaks out while disconnecting in the first place and plugs those lines as well.