3rd gen Transmission Cooler Upgrade

I forget the exact size but I use a small hitch pin I picked up from a local Ace hardware store. Bring the drill bit with you and see what's about the same size.

 

does the 2nd gen 750 series of transmissions have the thermostat?? I have seen mention of it in regard to the tundra so i woudl think it does..

And reposting this here since its a great article about added filtration. I have a magnefine but believe the WIX is just a relabled magnefine)

http://www.fourwheeler.com/how-to/t...atic-transmission-and-power-steering-filters/

and take a look at this posting (note , the title refers to the factory transmission pan filter, not inline filters)

 

Someone can correct me, but I don't believe the 750s have thermostats. I'm running really close to the temps the OP was running with his thermostat pinned (~150F) and I have a larger air to oil cooler added to my 4R.

 

i know the Tundra's have it so thought it may be on tacoma as well

http://parts.lakelandtoyota.com/p/T...L-TOWING-PACKAGE-WITH/3919750/3297134030.html

 

Easily could be. Ill be doing an oil change on the 4R today so i'll look, but they don't come with air to oil coolers like the Tacos and I assume Tundras do, so it may just not have it.

Does the stock cooler for them run transmission->Radiator cooler (water to oil)->air to oil cooler-> transmission?

 

Yes that's exactly how it flows.

Thanks for the reads @babylon5 BTW nice handle. Not the same show but thought you'd appreciate my plate

 

Dopey question... maybe...

Can anyone who has done this mod tell me if their V6 runs the transmission lines through the radiator before coming out to the tow package aux cooler?

I was fussing under the hood of my 4 banger yesterday and I noticed that I have a water-cooled transmission cooler already!
The trans lines flow up into the engine bay and through the cold side of the motor's radiator. Pretty good stuff, IMO. So while I should still probably monitor transmission temps, I can kill two birds with one stone on the cooling front by working on ways to keep the radiator cooler.

 

AWESOME!!!!!!!!

But, aren't you missing a 'C'?

 

Yes but only 7 characters on an AZ plate so close enough....

 

Looking for feedback in the trans temps with an extra cooler added to the 3rd gen V6 auto. I bought all the stuff now but am second guessing the outcome . From what I see , the towing package setup that comes with the truck seems to have a thermostat that opens at about 195 degrees . I have watched my trans temps with a scangage II now that the weather is hot here (90degree plus)and it seems to open up at about 195 .
Anyone else see this ?
What I am questioning is Even with an added cooler in line after the stock cooler , unless the thermostat is pinned open , will it not still run at 195 degrees because of the thermostat ?
I can see the need for a cooler and fan setup for low speed offroad use . But open road towing I see it running at 195 without pinning the thermostat. With the extra cooler I expect less spikes over 195 . I have seen 210 and more without towing and the stock setup when the outside temp was 70 .
Anyone ? @gearcruncher @Lord Humongous

 

If you add it inline w/ the existing cooler, you are correct in that it will not open until the thermostat kicks at in the 195 or so that you have seen. I would also agree that you probably would not see the spikes w/ the added cooler like you noted (210) w/ an added cooler, but that is just an educated guess at this point.

Personally, I'm pinning mine open as I do not see low temperatures much (I live in central Mississippi) and would rather have the peace of mind knowing I'm keeping the moving parts a bit cooler. I may remove it during the winter, but I will see what my ScanGaugeII reads at that point and decide.

I still think 195 is too hot considering the degradation in oil life at temps just above that, but that's just me.

 

that is what I am thinking also. I am in northern Arkansas and for most of the year I can see running it pinned . I wish I could buy a 175 degree thermostat.
Are you just pinning the stock setup and what temps are you seeing now in hot weather with it pinned ?

 

I do not have any data on the temperatures mine is running as I just got my ScanGaugeII ordered and it will arrive Monday. I'm just going off what other folks have seen (you included) and I'm concerned that even w/o towing, I'm guessing I'm running over 200 at times, so pinning the thermostat open is a no-brainer in my situation. Since we rarely see freezing temps down this far, I do not think it will hurt at all and I only see benefits at this point in time. I just haven't had the chance to crawl up under my truck and was going to work on it tomorrow. That and it's been raining here off and on for the last couple weeks makes working on my truck in the driveway a bit... unappealing.

 

Bueller... Bueller...

Seriously this is important for the V6 discussion as well, if you have your transmission lines run through the radiator I don't see why a tstat is even necessary. Running through the radiator should heat the transmission fluid to operating temps (over 150) as long as your motor is up to temp.

I don't even see a tstat on my 4 banger:

Cooler lines come out...

Mosey their way on forwards in a manner similar to a power steering cooler (I wonder if you could put fins on these for extra cooling??)...

And then bam, right into the cold side radiator tank.

I'm still just a little on the fence because I live in Phoenix and do offroading. I know there is a Toyota proving grounds out here past the west valley so it should have been tested in 110+ outside temps but uhhhhh, I still think it's an extreme scenario.

I'll have to get a scangauge and monitor temps I guess, but right now my OBD2 port is being hogged by that stupid insurance smartride shit. I guess I can't be too ass-blasted about it because so far it says I'm getting 40% off (the max) on my policy.

 

Post 1


Post 106

 

Gah I missed that, I was scrolling through pics to see if I could spot it.

Hmmm, interesting. Now I have no idea why they use a thermostat at all!

Also according to the parts catalog I'm looking at there IS a part number for an OE transmission cooler on the 4 banger. However this catalog has had confirmed errors before.

 

yes, babylon5 was one of my favorite Sci Fi series, have all five seasons on complete DVD set?
So i will venture a wild guess that you are a Trekkie

 

back to topic

On my 2004 odyssey i installed 13 row earls cooler which despite its small size is rated at 24,000 GVW. when i ran it as it the ATF after a long drive in 90F+ stop and go traffic was only luke warm to the touch so i knew in the fall, winter and spring the ATF would never get up to proper operating temperature. so i ran a thermostat that bypassed that cooler if temps where less than 180F..
Worked like a charm after that and despite the issues with 3rd gear clutch burnout on the odyssey 5 speed it still going strong. And also have magnefine filter in their as well.

Had my one minute of fame when i wrote to Road and Tracking asking about ATf temperature and my decision to use the termostat and they actually published my email in their technical questions sections

 

They used a thermostat because Tacoma,s are sold all over USA as well as Canada . It,s needed so the engine can warm the transmission in the morning .If the external transmission cooler was open to flow , there is a good chance in colder climates the transmission would never get to operating temps

 

Yeah I started to type a reply but "thinking out loud" I realized where my flawed assumption was.

I originally was thinking that running through the radiator would "normalize" the temps, that is if the coolant is up to 180 it would be heating the ATF as opposed to cooling it. But since the engine coolant has a tstat too, your cold side tank might be ambient for a while. That's the piece I was forgetting.

So it looks like if I decide to add a cooler, an aftermarket thermostat would be necessary because we do get near-freezing overnight temps during desert winters.

Strange that the 2.7 appears to have no thermostat on its loop, though.

The 3.5 has a thermostat, and that circular piece labeled 33490F at the very bottom is labeled as a cooler as well which has engine coolant lines coming to it:


But then the same diagram for the 2.7:


It all gets replaced with straight up hard lines!