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07-14-2012, 04:48 PM
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Hummer Veteran
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Join Date: Jan 2008
Location: High in the Colorado Rockies
Posts: 210
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Re: Tranny cooler installation
Quote:
Originally Posted by Egan
If you?ve done any research on the forums you know the stock transmission cooling setup is less than ideal. The transmission fluid flows through the inside of the radiator and an external transmission cooler.
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Egan, what year is your H2? My '05 didn't ship from the factory with an external tranny cooler.
Also when I installed my cooler I removed the tranny lines from the radiator (you just remove a retaining clip and they come right out) instead of cutting them. I then plugged the holes in the radiator with brass plugs instead of joining the upper and lower cut connections with a hose. Even neater still.
__________________
'05 H2 Lux, 37" KM2's on 17" Hutchinson Double Beadlocks, Cognito UCA's, Cognito Sway Bar Links, Custom Hydro-Assist Steering Upgrade, Eaton Front Differential Locker, 1" Rear Coil Spacers, Chevy Green Key Torsion Bar "Lift," Bilstein Shocks, Warn 9.5ti Multimount Winch, Dual Optima Yellow Top Battery's, Piaa & Hella Off-road lights, Gobi Rack, Tru-cool External Transmission Oil Cooler, Diablo Predator Hi-Octane Tune.
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07-15-2012, 01:33 AM
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Hummer Veteran
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Join Date: Jun 2012
Location: Granite Bay, Kalifornia
Posts: 156
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Re: Tranny cooler installation
Quote:
Originally Posted by SummitUp
Egan, what year is your H2? My '05 didn't ship from the factory with an external tranny cooler.
Also when I installed my cooler I removed the tranny lines from the radiator (you just remove a retaining clip and they come right out) instead of cutting them. I then plugged the holes in the radiator with brass plugs instead of joining the upper and lower cut connections with a hose. Even neater still.
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2005
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07-15-2012, 08:14 PM
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Hummer Novice
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Join Date: Jun 2012
Posts: 12
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Re: Tranny cooler installation
I got my Flex-O-lite 4120 Trans cooler installed today... Very easy to do but I must stress how important it is to Flare the lines that are going to the trans cooler. it is very easy to do and the Flare tool is only $10 at your local autozone. Also when you run your lines make sure that any line (rubber or metal) that touches anything metal... make sure that you cover it with something. I just cut open some 3/8 rubber line and put it over the line that comes in contact and chaffe against anything.
Trans temps after an hour of driving in city and highway are below what they were since I got the H2. This cooler is rated for 20,000 lbs GVRW the H2 weighs in at 8000 lbs give or take so that means with this cooler you could tow an additional 12k I do not plan on doing that so I think I am set. I will however get the bypass because here in Wisconsin we get some cold temps.
Here are the completed pics of the FAL 4120 that I got for $53 shipped from summit and comes with everything needed for the install. Minus the tube cutter and Flaring tool.

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07-16-2012, 07:43 AM
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Hummer Expert
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Join Date: Sep 2011
Location: Surprise, AZ
Posts: 717
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Re: Tranny cooler installation
looks good, nice work. I was waiting to see someone use the zips that go through the radator/condenser to secure the ext cooler.
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02-01-2013, 07:11 PM
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Hummer Novice
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Join Date: Jun 2010
Location: Mass
Posts: 11
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Re: Tranny cooler installation
I will be installing a tranny cooler soon. I had a couple questions before I placed the order. I live in Massachusetts, would you recommend the bypass? What exactly is the benifit of the bypass? Even if you live in a vey cold climate is there a downside not having the bypass?
I was looking into purchasing the Flex-a-lite 4120, how has this cooler been working out?
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02-01-2013, 08:04 PM
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Hummer Veteran
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Join Date: Jan 2008
Location: High in the Colorado Rockies
Posts: 210
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Re: Tranny cooler installation
Quote:
Originally Posted by chris4851
I will be installing a tranny cooler soon. I had a couple questions before I placed the order. I live in Massachusetts, would you recommend the bypass? What exactly is the benifit of the bypass? Even if you live in a vey cold climate is there a downside not having the bypass?
I was looking into purchasing the Flex-a-lite 4120, how has this cooler been working out?
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I can't speak for the the Flex-a-lite 4120 as I purchased the Tru-Cool Max cooler. I live at 9000ft. elevation in the Colorado Rockies (yeah, it gets real cold here on occasion!), so I ordered my cooler with the bypass option. The bypass is supposed to work in the same way the coolant thermostat in your engine works, i.e. it wont open to allow free flow of tranny fluid until the tranny has reached operating temperature.
However... I had nothing but problems with the bypass on my cooler. Tranny usually ran way too hot, so much so I thought the bypass unit was defective so I ordered a replacement. The replacement bypass unit wasn't any different and the tranny temps were still way too high even in cold weather so I re-plumbed my cooler without the bypass and never looked back.
Yes on really cold days it takes much longer for the tranny to "warm up" but in my case I never take my H2 on short trips so it doesn't really matter to me. What does matter to me is I wheel my "Deuce" hard on trails in Moab often in hot weather conditions so I need maximum flow of tranny fluid through the cooler and that isn't going to happen with the restriction the bypass unit places in the circuit.
Just my $.02
__________________
'05 H2 Lux, 37" KM2's on 17" Hutchinson Double Beadlocks, Cognito UCA's, Cognito Sway Bar Links, Custom Hydro-Assist Steering Upgrade, Eaton Front Differential Locker, 1" Rear Coil Spacers, Chevy Green Key Torsion Bar "Lift," Bilstein Shocks, Warn 9.5ti Multimount Winch, Dual Optima Yellow Top Battery's, Piaa & Hella Off-road lights, Gobi Rack, Tru-cool External Transmission Oil Cooler, Diablo Predator Hi-Octane Tune.
Last edited by SummitUp : 02-01-2013 at 08:18 PM.
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02-11-2013, 01:18 PM
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Hummer Novice
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Join Date: Jun 2010
Location: Mass
Posts: 11
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Re: Tranny cooler installation
I pulled the car in the garage this weekend to have a look at the bypass procedure before I purchased everything. I have a 2005 H2 and noticed that I already have a stock external tranny cooler. Is there any reason not to just bypass the radiator and still use the stock tranny cooler?
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