Transmission Temps

V8nuts · August 15, 2009

Well yesterday was the first time towing my 5100lb trailer with my 07 Silverado that is only rated for 4600lbs. My tranny temps got to 208 at 65mph and 205@70 do I need a cooler ? My rear gear is a 3.27

grayghost7 · August 15, 2009

Well yesterday was the first time towing my 5100lb trailer with my 07 Silverado that is only rated for 4600lbs. My tranny temps got to 208 at 65mph and 205@70 do I need a cooler ? My rear gear is a 3.27

I would add one for sure. this is one thing I do know about these new trucks. Mine has a small cooler on the front, but I want to double it's size. A cool tranny is a happy tranny and it will reduce wear and tear.

txab · August 15, 2009

Well yesterday was the first time towing my 5100lb trailer with my 07 Silverado that is only rated for 4600lbs. My tranny temps got to 208 at 65mph and 205@70 do I need a cooler ? My rear gear is a 3.27

I would add one for sure. this is one thing I do know about these new trucks. Mine has a small cooler on the front, but I want to double it's size. A cool tranny is a happy tranny and it will reduce wear and tear.

A big +1.

A Hayden 679 model will be plenty.

96chevy7.4L · August 15, 2009

looks at teh 18K or 20K super cooler from B&M that should be all you need. I use the 24K cooler in my 1 ton. just my opinion.

WaterGuy · August 15, 2009

This is what I installed.

Cooler w/fan

dlewis1111 · August 16, 2009

This is what I installed.

Cooler w/fan

What trans temps are you seeing now?

V8nuts · August 16, 2009

This is what I installed.

Cooler w/fan

is the fan on all the time?

rzauner · August 16, 2009

It comes with a thermostat. You would have to call Summit to see what the specs are.

WaterGuy · August 16, 2009

What trans temps are you seeing now?

Is the fan on all the time?

I picked up an ignition "run" signal and that triggers a relay which sends power to the fan. The fan came with a t'stat. It is NOT plumbed with the radiator.

According to my ScanGauge the fan comes on at about 165* and off at about 145*.

Before:

As temps go, it would be equal to or up to 15* greater than the water temp. If water was 200* then trans could be high as 215*. I've hit 220* on the trans. But, generally it was 195-200. This in various conditions. 95* days and local stop-n-go traffic or open interstate or interstate stop-n-go.

After:

Generally hovers around 165*. Some conditions I've seen 185* and 190* but not stay there.

The 4L60E reads the temp right after the converter which is the hottest part of the fluid flow.

BuckFeverZ · August 16, 2009

In addition to a tranny cooler, you may want to regear if you plan on towing a lot.

cujo8 · August 16, 2009

What do you folks use to measure your transmission temperature? Have any recommendations for a particular gauge setup and where did you mount the gauge? Thanks.

V8nuts · August 16, 2009

What do you folks use to measure your transmission temperature? Have any recommendations for a particular gauge setup and where did you mount the gauge? Thanks.

mine came with the truck stock I just hit the display buttons till it displays on the instrument panel and watch it as I tow.

Pilot12 · August 23, 2009

According to my ScanGauge the fan comes on at about 165* and off at about 145*.

Before:

As temps go, it would be equal to or up to 15* greater than the water temp. If water was 200* then trans could be high as 215*. I've hit 220* on the trans. But, generally it was 195-200. This in various conditions. 95* days and local stop-n-go traffic or open interstate or interstate stop-n-go.

After:

Generally hovers around 165*. Some conditions I've seen 185* and 190* but not stay there.

The 4L60E reads the temp right after the converter which is the hottest part of the fluid flow.

What about this; I have HD trailer package and factory tranny cooler. (5.3L 4sp W/T STD bed 4x4). Only plan on occasional towing of light trailer or boat. I'm getting tranny temps upwards of 190* without a trailer. Phoenix has been hot, but that's just tooling down the freeway at 65mph. Does that seem too hot?