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How To: 2012 Armada - Long Tru Cool LPD Transmission Cooler (SR4588) Install

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20K views 13 replies 6 participants last post by  bigj6360  
#1 · (Edited)
I looked at this thread on Titan talk, but there were a few glaring omissions. Not to bad mouth anyone as it was super helpful, but there's a few Armada specific things (specifically the bumper).

I'm not sure what year the lower grille became fixed into the bumper, but the biggest snag (not that it's that hard to get past) was that for my Armada, the entire bumper had to come off so that you could put a pair of lower mounts for the cooler.

So, the first step looks something like this.

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7 quarter turn clips on the upper grille, and then a bunch of phillips head clips and screws for the bumper itself. The only 2 "hard" ones are 4 phillips head / 10mm screws that you need to be able to move the splash shield out of the way to access:

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The next glaring omission from that thread was where to mount the bottom of the cooler. The logical place appears to be the main bumper beam.

I went with a pair of RivNuts / Nutserts, as that seemed like the best / most secure option with a blind install on those (ie: you can't get to the back of the hole to install regular nuts).

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After that, I fabbed a pair of brackets using the bars that Long Tru Cool includes in the kit. I have NO idea how you'd get a tool onto the backs of these to tighten nuts or bolts, so I took cheated and broke out the big guns, and welded on a pair of weld-nuts onto them. This way, the brackets can be bolted in place to the bumper bar, the cooler can be lowered in place, and then you just have to worry about tightening the bolts:

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A test fit before painting the brackets, so that I could fab up the upper bracket.

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Because there's not really any load on the upper bracket and it's mostly for positioning the cooler at this point, I decided to only do a solitary bracket there. Did another riv-nut in the plastic (!?) bar below the horns, and welded another nut to the back of the bracket for the cooler mount. There's a bit of steel in the way, but you can get a t-handle under that cross-bar to tighten up that bolt:

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Installed. Note the hose that comes out near the passenger side of the cooler. There wasn't a ton of clearance between the hose and the cooler, so I wrapped it with a piece of 3/8" fuel hose I had sitting around as a buffer between the metal and rubber hose.

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And back on the ground to check everything for leaks after filling it with fluid.

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Presto! And now I don't have to worry about the radiator oil cooler taking a crap and f**king up my transmission. Win!


I'm glad I hit the brackets with a little black paint. You can't even tell anything not-stock is back there if you didn't know any better.

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If you're interested in using rivnuts but are turned off by the cost of the installation tool, you can make your own with a piece of 1/8 or 3/16" flat stock, a Class 10.9 flange-head bolt and a drill. That's what I did to install a few of them on my racecar, and used it again to do this project, and it works great.

I have details on how to make your own HERE, or you can buy one here (no affiliation). But it's basically $10 for a piece of steel bar-stock and a bolt. That's a hell of a mark up...

For something like this, there's no reason to go any bigger than M6, so that's what I used. If you don't happen to have a box full of M6 hardware, here are a few helpful links:
Zinc-Plated Steel Cap Screw, M6x1mm, 16 mm long
Zinc-Plated Steel Rivet Nut, Open End, M6x1.0 Thread

NAPA Fuel Injection Hose Clamps for 5/8" OD / 3/8" ID hose.


Hopefully this'll help someone else.
 
#3 ·
Awesome post. Thanks for your step by step assist
 
#4 ·
No worries, it's a pretty straight forward install, just time consuming. Lots of test fit, tweak, test fit, tweak, weld, test fit, tweak, drill, test fit...

Also, I'm sure there's some detail I left out too, but the bumper and the lower mounting location were the biggest questions I had going in. I looked at a couple YouTube videos that showed how to remove the lower grill from a Titan / Armada. Then I go look at mine and find out that it's 100% molded in as part of the bumper, which is annoying.

The flip-side of that is that annoyance is that I finally had an excuse to install the HIDs I've had sitting on the shelf basically since we bought the truck. Having the bumper off left a couple of SUPER convenient places to mount the ballast and transformer (? I think? Electrons and I don't have a great relationship) securely.
 
#5 · (Edited)
Oh, and if you're interested in using rivnuts but are turned off by the cost of the installation tool, you can make your own with a piece of 1/8 or 3/16" flat stock, a Class 10.9 flange-head bolt and a drill. That's what I did to install a few of them on my racecar, and used it again to do this project, and it works great.

I have details on how to make your own HERE, or you can buy one here (no affiliation). But it's basically $10 for a piece of steel bar-stock and a bolt. That's a hell of a mark up...

For something like this, there's no reason to go any bigger than M6, so that's what I used. If you don't happen to have a box full of M6 hardware, here are a few helpful links:
Zinc-Plated Steel Cap Screw, M6x1mm, 16 mm long
Zinc-Plated Steel Rivet Nut, Open End, M6x1.0 Thread
 
#6 ·
Nice write up for the Armada guys! This mod dropped my tranny temps 15* and I never see over 165* in Louisiana heat towing or not. Best of all is this mods isolates the transmission from the radiator that is prone to cracking and destroying that $4500 tranny. This is a good peace of mind with plastic radiators and heat...
 
#10 ·
Man isn't it. Boy does it stay cooler on the gauge. And not even by a little bit.

Point of note: I'm not super happy with the factory clamps I reused, or the worm clamps from the kit that went in where the factory bits were too far gone. I'd found a link in the Titan Talk thread for a part# from OReiley's Auto for EFI hose clamps, but it was a dead link and I couldn't find them. So, I bought a dozen (more than I need for this job) and I'm going to redo all the hose connections tomorrow.

If anyone's doing this soon, here's the info from NAPA to get the proper parts:

Hose Clamps, Fuel Injection; #16

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Clamp Size Range : 9/16"-5/8"
Hose Size Range : 3/8"


These are SO much better than worm clamps.
 
#13 ·
I reside in NYC, so I live in traffic. I had done this mod on my previous 04 and never an issue with temps rising, even in traffic. But I’m also borderline OCD with DIY maintenance. Since a good amount of my driving is stop and go traffic, I always made it a point to drain and fill with fresh Maxlife ATF just about every year.
 
#14 ·
Just to swing back around on this topic for those looking to bypass the radiator and may be concerned with heat. Here are some things I recently discovered after doing this mod.

1. if you never/rarely tow or tow a small utility trailer, I think this is a great solution that is inexpensive for reducing the Risk of the older OEM radiator membrane failing.

2. if you tow, do something different. One option would be to upgrade the radiator (I am currently looking to do this). I, somewhat regularly (2-3 times a month) drive across the eastern continental divide (Interstate 40 and 7-8% grade) and have never had issues with this trans cooler bypass. It works very well even in summer months while the inside is full of stuff and people or not. I have never had an overheat issue.

This past weekend was my first time towing a camper over the divide. My camper is about 4,500 pounds and I / my cooling system had a difficult time staying under the warning line on the trans temp gauge. I ended up in the Tennessee mountains where sometimes it’s easy to climbs for minutes at a time all while doing 30mph.

there just isn’t enough airflow or BTUs to maintain temps in these situations

if you really want to bypass the radiator and use a transcooler only, get a fan. I looked for one in TN, but you may need an 8” fan. 10” would likely be a tight fit and was the smallest one I could find.

I am very happy with this mod for daily driving in the southeast, but I won’t be towing in the mountains again before I get the radiator replaced.

As a comparison, the OEM radiator has no issues towing in these situations. I have made the trip several times in the armada without temp issues.