G56 Transmission cooling system

[MichaelOverfield]

After seeing some others who have done similar due to known high temp issues with the G56, I finally got around to completing my design and install. Pictures follow, when I get time I'll try to put together a parts list. The orange filter is for the transmission fluid, other 2 are fuel filters. The system connects to the FastCoolers, has isolation valves in case of damage or leaks. There is an oil pump, filter, cooler, electric fan. The system has a thermostat for automatic operation, and will also have a manual switch with indicating light in cab, with a relay to carry the motor loads. #ad


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[JWMiller]

So how hot is to hot? This was taken pulling my 37 ft. 5th wheeler 65 MPH at 75 outside.
I am using Mobile 50wt. in the G56

 

[MichaelOverfield]

So how hot is to hot? This was taken pulling my 37 ft. 5th wheeler 65 MPH at 75 outside.
I am using Mobile 50wt. in the G56

From what I read on oils, below 200F and the oil is fine. That said, the concern with G56 is case expansion at high temperature, this loosens up the shaft clearances. In the latter case, the lower the better. I have not yet tried a long drive under load with the cooler, but I've manually run it for the secondary filtration function.

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[RVTRKN]

My G56 got as hot as 250* just pulling my boat. It also browned the bearings, that Standard Transmission replaced at only 30K miles. If yours run cool, I'm happy for you, but I think that most run hotter than 200*. It was worth every penny spent.

 

[RVTRKN]

After seeing some others who have done similar due to known high temp issues with the G56, I finally got around to completing my design and install. Pictures follow, when I get time I'll try to put together a parts list. The orange filter is for the transmission fluid, other 2 are fuel filters. The system connects to the FastCoolers, has isolation valves in case of damage or leaks. There is an oil pump, filter, cooler, electric fan. The system has a thermostat for automatic operation, and will also have a manual switch with indicating light in cab, with a relay to carry the motor loads. #ad


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[RVTRKN]

Post some average temperatures for us, as well as your cycling temps. I run mine no warmer than 180* and cool it to 160*.

 

[MichaelOverfield]

Post some average temperatures for us, as well as your cycling temps. I run mine no warmer than 180* and cool it to 160*.

Will do, when I get them. I have had limited drive time thus far, and only lower temperatures thus far. The temperature switch I used is on at 200F, off at 185F. Perhaps a bit high, however I can manually turn it on with the dash mounted switch.

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[KATOOM]

VERY interesting write up. I installed Fastcoolers on my 4500 and tow in 1:1, not overdrive. The running temps are typically well below 200* and stable towing our 15k toy hauler, until I have to downshift into 3rd for extended steep grade pulls. Then the temperatures start to climb, but generally never crest 200*. I've looked for a way to run a pump system but nothing was available back then. Can you list the parts and costs for what you did? Thank you...

 

[MichaelOverfield]

VERY interesting write up. I installed Fastcoolers on my 4500 and tow in 1:1, not overdrive. The running temps are typically well below 200* and stable towing our 15k toy hauler, until I have to downshift into 3rd for extended steep grade pulls. Then the temperatures start to climb, but generally never crest 200*. I've looked for a way to run a pump system but nothing was available back then. Can you list the parts and costs for what you did? Thank you...

When I get a chance, I'll put up a list. If I recall correctly, about $200 or so in parts. All found on Amazon.com.

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[RVTRKN]

When I get a chance, I'll put up a list. If I recall correctly, about $200 or so in parts. All found on Amazon.com.

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Here are the parts i used, but it doesn't show the fast coolers in the next picture.

 

[KATOOM]

So everything here looks different. Did you change the install or refine your project? And as much as I could see where a filter would benefit, I could also see where it wouldnt be that necessary either.
Also, did you wire the pump to a thermostat or does it come on with the key?

 

[RVTRKN]

This my install, not the OP.

 

[KATOOM]

Didnt catch that... Thanks. Nice job too.

What about the pump run time? On with key or thermostat?

 

[RVTRKN]

The pump is rated for continous duty, if I chose to always keep it on. The heat exchanger is for the OEM auto equiped truck. The OEM radiator is the same radiator for either auto or standard transmission truck. So I just purchased all the hardware and a heat exchanger for an auto equiped truck. Because it has a thermo bypass built in, I can run it continuos, but I like it to build up the temp first.

 

[KATOOM]

Thank you... But I dont see a thermostat in your pictures.

 

[RVTRKN]

If you look at the heat exchanger, it has a thermo bypass (thermostat) built in, that will recirculate the oil back to the trans bypassing the heat exchanger. It closes the bypass after 135*, or so I’m told, and forces it through the exchanger.

 

[MichaelOverfield]

VERY interesting write up. I installed Fastcoolers on my 4500 and tow in 1:1, not overdrive. The running temps are typically well below 200* and stable towing our 15k toy hauler, until I have to downshift into 3rd for extended steep grade pulls. Then the temperatures start to climb, but generally never crest 200*. I've looked for a way to run a pump system but nothing was available back then. Can you list the parts and costs for what you did? Thank you...

OK, here is my list:

Transmission cooler ($42):

https://smile.amazon.com/gp/product/B000C3DDKO/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

Fan ($20):

https://smile.amazon.com/gp/product/B00W758RMO/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

Oil Pump ($58):

https://smile.amazon.com/gp/product/B01MF9830S/ref=oh_aui_search_detailpage?ie=UTF8&psc=1


Filter base ($30):

https://smile.amazon.com/gp/product/B004XOQ0GM/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1


Filter ($15) :

https://smile.amazon.com/gp/product/B0015RCD66/ref=oh_aui_search_detailpage?ie=UTF8&psc=1


Thermostat ($9)*:

https://smile.amazon.com/gp/product/B01LWL6ZZB/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

* Note, consider lower a temp band such as 170 to 185F:

https://smile.amazon.com/Partsam-El..._rd_t=40701&psc=1&refRID=98PJ8FMFPVYKQFX1Q30R


Relay ($14/for 10ea, only one needed):

https://smile.amazon.com/gp/product/B01KVZ2KEM/ref=oh_aui_search_detailpage?ie=UTF8&psc=1


Hose: ($21)

https://smile.amazon.com/dp/B004XONTCU/ref=psdc_15710771_t2_B004XONNMG


Fittings ($16 + $14):

https://smile.amazon.com/gp/product/B017N4TD4O/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

https://smile.amazon.com/gp/product/B017N4TIMG/ref=oh_aui_search_detailpage?ie=UTF8&psc=1


Adapters ($11):

https://smile.amazon.com/gp/product/B0195TQJR4/ref=oh_aui_search_detailpage?ie=UTF8&psc=1


Various Pipe fittings and adapters depending on how you choose to route your cooler lines..

Various steel to fabricate the cooler mount, you'll want some bolts, (self tapping for the frame mount helps, if possible).

Wire

Switch if you want a manual run option.

I would add a Transmission Temp guage as part of your install as well.

FastCoolers (used for threaded fittings for cooler lines, can adapt direct to OEM PTO desired, or use the Fast cooler thick Al cover with adapter plate) FastCoolers provide an additional 2 quarts of oil, but make the clearance to the exhaust downpipe pretty tight): (Geno’s Garage)

https://www.genosgarage.com/product/fc-sg-cover-kit-fast-coolers/transmission-coolers

https://www.genosgarage.com/product/fc-g56-adapter/transmission-coolers

https://www.genosgarage.com/product/fc-6-spd-dg/transmission-coolers


Optional:

Cut off valves (I added as a way to cut of the cooler loop in case of damage/leak while on the road) ($22):

https://smile.amazon.com/gp/product/B0714DT8QN/ref=oh_aui_search_detailpage?ie=UTF8&psc=1


Elbow (depending on where you mount the filter base, may or may not need this) ($7):

https://smile.amazon.com/gp/product/B003GSKX82/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

 

[Randomrunner12]

How did you get your 1 wire Temp sensor to ground out to the PTO cover?

I have a TDS billet aluminum cover on mine with a temp sensor location and I'm getting voltage and resistance but dont seem to get betting a temp reading from the trans pan. once I figure out this issue i can work on the rest.

 

[Randomrunner12]

also, not sure why but i updated my sig and it wont display under my name anymore so i think i have to be a paid subscriber.

 

[MichaelOverfield]

How did you get your 1 wire Temp sensor to ground out to the PTO cover?

I have a TDS billet aluminum cover on mine with a temp sensor location and I'm getting voltage and resistance but dont seem to get betting a temp reading from the trans pan. once I figure out this issue i can work on the rest.

Well, I have the aluminum cover also, it had a solid ground via the bolts. They have a pretty high torque spec. It should be sufficiently grounded.

Having said that, I have not seen mine come on in auto based on Temperatures, I did see temperature over 200F so I manually turned on the pump.

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