Transmission Temp

[jarydM]

saving this post for future reference when I start pulling the camper in ~6 months.

 

[rzabel]

I tow a lot, and in hot weather and occasional mountains. I have the stock transmission cooler for my 2500 with the 4L85E. It seems to work fine. My temperatures are always in the normal range (180F to 200F). Why would I want to get the temperatures to 135F to 165F? Shouldn't the transmission perform best when operating in the normal design range?

 

[cycho]

if you are going to be hauling something bigger out there in the desert and are concerned about heat you can add a external trans cooler in addition to anything that is factory, several of the members here run the tru-cool 40k, they run about $130 online and is easy to install. I added one on mine and a B&M deep transmission pan (70392) that gives it an extra 2qt capacity. I was getting 200+ temps all the time just driving (I have a heavy foot), now my temps run about 136 +/- a few degrees it might hit 165 if i'm pushing it kinda hard and it's hot out. winter time it runs about 10 deg's lower.

This one? https://www.amazon.com/dp/B00803CTD...olid=1K7PHQ7IUO7LV&psc=0&ref_=lv_ov_lig_dp_it

 

[Doubeleive]

This one? https://www.amazon.com/dp/B00803CTD...olid=1K7PHQ7IUO7LV&psc=0&ref_=lv_ov_lig_dp_it

yes this one, about $30 cheaper on ebay
https://www.ebay.com/itm/Tru-Cool-M...ppingMethodExpress!95219!US!-1&frcectupt=true

 

[jamoody]

I believe an after factory transmission cooler is needed for regular towing in extreme conditions (desert heat and mountain climbs). I installed https://www.etrailer.com/Transmission-Coolers/Derale/D13502.html before my cross country trip from the east coast through the Rockies and southwest desert last summer pulling a 4000lb trailer. The transmission temperature sat at 195F most of the time at 65 mph, climbing occasionally to 201F max on a 10,000 ft assent. For occasional towing on the flat you could probably get by without a cooler. I'm told the coolant line valve opens at 195F.

 

[BG1988]

I tow a lot, and in hot weather and occasional mountains. I have the stock transmission cooler for my 2500 with the 4L85E. It seems to work fine. My temperatures are always in the normal range (180F to 200F). Why would I want to get the temperatures to 135F to 165F? Shouldn't the transmission perform best when operating in the normal design range?

depends how long you want it to last service life drops as the temperature rises

 

[Mickey_7106]

Personally i don't like going over 190° And I'll be worried past 220°

Reference:2013 LTZ that I have owned for a few months.

Drove home from our cabin Sunday pulling a small enclosed trailer and noticed that my transmission reached 203° by the time I pulled into the driveway. Never saw it this hot. But it makes sense being that it's cooled through the radiator...right? Outside temp was in the 90's.

Just wondering if it's normal because I'll soon be pulling a much larger trailer in the Arizona

 

[Tractoman]

Here is a link to a post from when I installed mine. Well worth the effort.
https://www.tahoeyukonforum.com/threads/trans-cooler-installed.92794/

 

[avalonandl]

Over 260 is NOT GOOD. The new fluids are ok up to 260.

 

[cycho]

Today we installed an 8" drop hitch, brake controller and ordered a trans cooler. Then pulled a 20 foot enclosed trailer about 40 miles. Probably around 3400 lbs with today's load. The trans temp got to a high of 208° once we were on city streets. On the freeway it stayed just below 200° as long as we were moving. Air temps were in the 80's.

I was looking for a 10" drop but 8" was all I could find and I was in a hurry. It worked better than I thought, the Tahoe does drop about an inch so the trailer is only a slight bit high in the front. Perhaps a front level kit will help bring the back down and inch?
Also I have always towed this trailer with a weight distribution hitch and sway bar. Today was without all of that. It did sway a bit but it was real windy. Friday I'll be making a 2.5 hour trip to the North so I'll see how the Tahoe/ bare hitch works out and I'll be keeping a close eye on the trans temp. We'll be traveling late at night with closer to 4000 lbs, then home during the day but empty. Fingers crossed