Transmission Temp

[blockhead]

Sorry I posted about this a while back, but can't seem to find that post. Anyway-

I was running up Mosquito pass in CO in early August when the transmission (according to Scangauge) reached 285. This is with the TRD cooler and new Toyota fluid. Shortly thereafter I turned around an it began cooling immediately.

I was a bit loaded with 3 adults, 1 kid an 2 dogs.

I think the issue now was (based on some info. In the Overlanders Handbook) that it may have been overheating as I had the "4WD" button depressed on the transfer stick as opposed to manually shifted into H4.

Does this make a difference? Am I darn lucky my tranny didn't fry?

 

[Mike&Ike]

Are you running it inline with your current trans cooler? It may be inadequate for cooling with just the TRD cooler.

 

[blockhead]

Yes, just the TRD cooler installed in line with the radiator (new).

Tranny-cooler-radiator-tranny I believe.

 

[LittleCaesar]

Count your blessings. I'd drain some of the fluid in there and refill with new.

If you are going to attempt that again in Aug, put a fan on the cooler.

While the TRD cooler may be adequate for the road, I would think that something a little beefier would be better. But since I have never visited CO with my 4runner, I'll let others chime in who have.

 

[nissanh]

The series should be transmission - Radiator cooler - Air cooler - transmission.

 

[tacojeff]

I had a very similar experience while running Engineers pass in May. Mine was up around 270 with a new external cooler and the stock one. I worried the whole trip because it was 220-250 consistently the whole according to the scan gauge. I have since installed a mechanical gauge and it reads from 30 to 50 degrees cooler than the scan gauge, even reading right at the transmission output line. Long story short, I wouldn't trust the scan gauge.

 

[Qyota]

Did you have O/D off?

 

[CXS]

I had a very similar experience while running Engineers pass in May. Mine was up around 270 with a new external cooler and the stock one. I worried the whole trip because it was 220-250 consistently the whole according to the scan gauge. I have since installed a mechanical gauge and it reads from 30 to 50 degrees cooler than the scan gauge, even reading right at the transmission output line. Long story short, I wouldn't trust the scan gauge.

Resurrecting this old thread when it kind of answered my question. My question is regarding the accuracy of the ScanGaugeII and transmission temps. TacoJeff's finding above is one example, does anyone know of another verified descrepency of the SG tranny reading and/or where this reading comes from?

I'm asking because I've seen SG readings of 250° hauling my trailer in the mountains and I have the Limited and tranny cooler and the temp reading just doesn't seem right.

 

[thor999]

I'm in Co as well, and wheeling around in the winter even, I hit temps up to 220 IMMEDIATELY when in 4hi, B&M 70268 bypass, no fan, SCll. I admit though, I can smell trans fluid at that point.

 

[19963.4lsr5]

I don't know specifically where the temp sensor is on the toyota........but usually any temp sensor the PCM uses is in the return line after the cooler. Not pan oil temp.

 

[Robb235]

How "beefy" is the TRD trans cooler? Is it comparable to the B&M 70268 or 70264?