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Old 11-29-2016, 01:48 PM   #11
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5.4/4r75 is good for 13,000 combined with the proper gearing (4.10 with 31" tires).

Glider - skip the Tru-Cool cold weather bypass. Mine didn't work, and others have reported the same. I overheated my transmission and had to do an emergency parking lot bypass of my bypass. I just block the grill now in really cold weather when I'm not towing.
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Old 11-29-2016, 01:52 PM   #12
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Glider - skip the Tru-Cool cold weather bypass. Mine didn't work, and others have reported the same. I overheated my transmission and had to do an emergency parking lot bypass of my bypass. I just block the grill now in really cold weather when I'm not towing.
Yikes--thank you, carringb! I'll take your advice.
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Old 11-29-2016, 01:54 PM   #13
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Unless you live in a very very cold environment skip thermostat for a transmission cooler. I don't have one and my temperatures are always good. But I don't have your transmission I have a 4r100...
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Old 11-29-2016, 02:19 PM   #14
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Another piece of low hanging fruit might be your roof rack Hard to tell but it looks like steel? There are much nicer aluminum racks on the market, including those with slats and what not for standing or photography. Could easily save 100lb or more of relatively expensive fruit to pick.
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Old 11-29-2016, 02:39 PM   #15
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Could you give me the specific Tru-Cool model number you used? I have a 4R75E, and I'm currently planning a 4x4 conversion. This might be a perfect time to install a Tru-Cool.

It looks like they have two 45,000 BTU models--the LPD4739, which includes a cold weather bypass, and the LPD47391, which does not. Which one did you choose?

Thanks-
Bianca
I used the one without the cold weather bypass...since I'm in So Cal and rarely in cold weather. The bypass is a separate valve installed in the hoses and can be installed later if I feel I need it. It allows the trans fluid to bypass the cooler when it's cold......you typically want the trans fluid to reach at least 140 deg F so that condensation/moisture doesn't accumulate in the trans.
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Old 11-29-2016, 02:41 PM   #16
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Another piece of low hanging fruit might be your roof rack Hard to tell but it looks like steel? There are much nicer aluminum racks on the market, including those with slats and what not for standing or photography. Could easily save 100lb or more of relatively expensive fruit to pick.
Aluminess racks are what......around $40/lb??
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Old 11-29-2016, 02:55 PM   #17
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Aluminess racks are what......around $40/lb??
Expensive fruit for sure but I was thinking along the lines of Ujoint or the K9 rack from Equipt. Eezi-Awn K9 Expedition Roof Racks | Equipt Expedition Outfitters

More like $20/lb

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I used the one without the cold weather bypass...since I'm in So Cal and rarely in cold weather. The bypass is a separate valve installed in the hoses and can be installed later if I feel I need it. It allows the trans fluid to bypass the cooler when it's cold......you typically want the trans fluid to reach at least 140 deg F so that condensation/moisture doesn't accumulate in the trans.
The Tru-Cool is has been one of the best mods to date on my rig. TFT went from consistently +200F to 165-175F as the new norm. I didn't even get it over 200F towing a trail loaded with rafting equipment over 7% Douglas Pass in CO last Sept.
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Old 11-29-2016, 03:03 PM   #18
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I used the one without the cold weather bypass...since I'm in So Cal and rarely in cold weather. The bypass is a separate valve installed in the hoses and can be installed later if I feel I need it. It allows the trans fluid to bypass the cooler when it's cold......you typically want the trans fluid to reach at least 140 deg F so that condensation/moisture doesn't accumulate in the trans.
Thank you, boywonder! That is really helpful. Sounds like I should go for the cooler without the bypass paired with a trannie temp gauge. :-)
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Old 11-29-2016, 03:12 PM   #19
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Aluminess racks are what......around $40/lb??
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Thank you, boywonder! That is really helpful. Sounds like I should go for the cooler without the bypass paired with a trannie temp gauge. :-)
I bought mine from Oregon Performance Trannsmission but Dieselsite is competitively priced and also has some additional info.
Tru-Cool Max 40,000 GVW Automatic Transmission Fluid Oil Cooler 40K True Long Brand 4739-1 LPD47391: Automatic Transmission Rebuild Parts From Oregon Performance 700R4 4L60E E4OD 4R100 4R70W 4R75E
TRU-COOL 4739-1 TRANSMISSION COOLER
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Old 11-29-2016, 03:17 PM   #20
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Thanks, that's helpful. It would be fun to come up with a bypass system using a simple electric solenoid-controlled mechanical diverter valve. Watch the temp gauge; if it starts running cold, flip the switch and bypass. That's more points of failure than carringb's "cover the grill" approach, but it would be cool.
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