Tru-Cool Max Transmission Cooler 40,000 GVW Fluid Oil 40K True Long Brand 4739-1 LPD47391 Automatic

OPT Product Code: LNG-47391
UPC Code: 621859473915

(4.9) 39 Reviews

$139.99
Tru-Cool Max Transmission Cooler 40,000 GVW Fluid Oil 40K True Long Brand 4739-1 LPD47391 Automatic

Product Details


Tru-Cool Max transmission cooler by Long Manufacturing

Part numbers: LPD47391, 750-47391P5, OC-47391, OC-4739-1, LPD-47391

GVW Rating: 40,000 GVW

BTU Rating: 45,000

Cooler size: 8.5" x 22.75" x 1.25"

The fittings on this cooler are 3/8" inverted flare.

Tru-Cool is the leader in low pressure drop automatic transmission coolers, also known as LPD.

This is the ultimate cooler for heavy towing and is a must for heavy duty applications, including racing. Heat is what kills an automatic transmission. If you want to extend the life of your transmission and avoid a premature, costly rebuild, this is very cheap insurance.

All parts and instructions are included to mount and plumb this cooler. If you want to install this cooler with upgraded hose and fittings, the 5/8”-18 threads in the cooler would allow you to convert over to AN style to use with braided or Socketless hose.  Upgraded line and fittings would need to be purchased separately.  

Retail price is $200+.

All True-Cool coolers come with a manufacturer's limited lifetime warranty. 

UPC: 621859047390

(Purchase Part number LNG-4739 for this same cooler with the thermal-bypass.)

Frequently Asked Questions

1. Can this cooler be used to by-pass the radiator?

Yes, this cooler is large enough to allow the by-pass of your radiator. If you live in a climate where it is routinely below freezing in the winter, you may want to consider the cooler with the thermal by-pass, under part number LNG-4739.

Tru-Cool Max Transmission Cooler 40,000 GVW Fluid Oil 40K True Long Brand 4739-1 LPD47391 Automatic

OPT Product Code: LNG-47391
UPC Code: 621859473915

(4.9) 39 Reviews

$139.99

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5
Works like a charm on a 2001 F250
Andrew Kruse
07/16/2021
Verified Buyer
Before installing, we towed a 12,000 lb fifth wheel in 90-degree heat, we would hit 220 going up steep hills and have to pull over to cool down. Once we installed this on it, we never went over 180 degrees in similar conditions, except with much steeper hills. Regular driving without a camper it never exceeds 140 degrees. This thing is exceptional.
1 of 1 customers found this helpful.
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5
very happy Silverado owner
Carl N Archuleta
07/04/2021
Verified Buyer
shipped fast and very easy install. My Silverado Z-71 was getting transmission temperatures up over 200 degrees on the highway after installing my lift and 35's, but after installing the Tru-Cool 40k we went on the highway with outside temps in the 90's and giving my truck hell the highest the transmission temperature got was 180. So I'm am very pleased with this product, price, and ease of installation. Thanks guys and God bless. 👊💯😎
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5
Tru-Cool 40k for Pontiac Grand Prix GXP
Brandon
06/24/2021
Verified Buyer
First of all, I am extremely happy with OPT. They repackaged the 40k cooler in a larger box and took the hose and mounting equipment out of the original box to prevent the mounting equipment from damaging the cooler. 10/10 Secondly, this cooler has worked great in standalone configuration on my 2006 Pontiac Grand Prix GXP. I created a website with a guide on how to install one of these coolers. https://sites.google.com/view/grand-prix-gxp-trans-cooler/how-to-install-a-transmission-cooler-on-a-2004-2008-pontiac-grand-prix-gxp I live in Texas and our outside temperature range is typically 30 to 110 degrees, more or less. It's currently June, and the highest temperature I have seen my transmission fluid be is 163 degrees on a 98 degree day. Any temperature under 200 degrees is ideal. These GXPs tend to run very hot without modification, reaching up to 220 degrees on a 30 minute drive on a very hot day. Even on a cold day, it'll get much hotter than 180 degrees on a long drive. This cooler in standalone configuration certainly solves that problem for me. The only downside to the 40k is that due to its huge size, the way I mounted it required me to modify some plastic on my car I wish I didn't have to modify. It was entirely due to the inlet and outlet being on the bottom. I would suggest to any other LS4 vehicle owners, that if you don't live in a place that often gets over 100 degrees outside, that you save yourself some trouble and get a Tru-Cool 30k instead. That one has the inlet and outlet on the side instead of bottom, so plumbing it to your transmission will be a lot simpler.
1 of 1 customers found this helpful.
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5
Clean ,not damage, came with fittings
Louis G
06/07/2021
Verified Buyer
This is second time I've ordered from them ,quality and no issues with shipping
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5
2003 Silverado SS
Michael Frank
06/01/2021
Verified Buyer
Amazing product! Normally. I’d reach 200° on a 75° day and I’m unable to even break 110 after this install. Transmission seems much happier and now has the ability to stay cooler.
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5
40k try cool
Gabriel
05/06/2021
Verified Buyer
Great!!!
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5
Awesome ATF cooler
08 silverado
04/18/2021
Verified Buyer
After installing, & observing fluid temperature range.. Tru-Cool Max, works excellent, on keeping the ATF temperature down when towing & just normal driving. Thank You.. Oregon Performance Transmission.
3 of 3 customers found this helpful.
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5
Great product
Daniel Mejia
03/12/2021
Verified Buyer
Great product dropped my trans temp after installing 3600 stall only down side was extremely slow shipping
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5
Very nicely packaged
Michael Hernandez
12/15/2020
Verified Buyer
My cooler came very nicely packaged. Also this cooler works way better than my stock trans cooler. Easy install and a good price. I recommend Oregon Performance. I wish I could leave pictures of my install lol
2 of 2 customers found this helpful.
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5
2019 Tundra
Ricardo Vale
12/04/2020
Verified Buyer
Since the 2019 and 2020 Tundra now come without a transmission cooler,, this was an excellent choice.. Cooler looks very well built. I used the brackets that came with the kit. Fit perfectly. I have pictures if needed.
1 of 1 customers found this helpful.
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5
40k trans cooler
Pompeyo
11/16/2020
Verified Buyer
Super awesome cooler with a built trans and cammed truck keeps temps roughly around 130ish
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5
Bigger and cooler
C.J. HERRERA
09/16/2020
Verified Buyer
Was a fairly easy install and worth it, I did the install myself and was easy.
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5
Amazing Tranny Cooler
Matt Kuhar
08/23/2020
Verified Buyer
Absolutely incredible results on my 2007.5 Silverado 1500. Cruising around id get to about 210 on the gauge, if i was romping it i could see 230 or more. Now, I struggle to see 130 on a cool night, never above 150 or so during heat of the day. Loving it!!!
2 of 2 customers found this helpful.
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4
01 2500HD
Paul
07/10/2020
Verified Buyer
Arrived promptly. Lowered my trans temp while towing 6000 lbs up hills on 80 degree Fahrenheit days at 3300 feet above sea level. Previously 230 degrees Fahrenheit down to 169. Averages about 140 degrees Fahrenheit with no load, on 75 degree days at 3300 feet. Prior to install have pulled about 14,000 lbs and believe I could better do so now and not exceed 210-220 degrees Fahrenheit. I haven't tried winter driving at -20 degree Fahrenheit yet, but hope the thermostat bypass works. Mileage at install 246,000 miles. Transmission 4L80E. Only drawback is installation is not plug and play for 2001 Chevy 2500 HD. Needed a tubing cutter to cleanly cut existing steel transmission cooler lines for attaching rubber hoses to have sweeping curves. Had to flip existing transmission cooler bracket upside down and notch ends. Drill it to match lower holes on this new cooler and then use the supplied self tapping bolts. You then have to find a way to attach your outside air temperature sensor. I fabricated two of the supplied metal tabs into a crude bracket. Also, you will need to cut off the welded tab holding the power steering cooler to the frame that holds the hood latch and tranny cooler. I used a cutting wheel on my grinder. Then use a strong zip-tie to reattach the power steering cooler to the said frame. There are aftermarket brackets. they may save these fabrication steps? Hoses are rubber and use hose clamps to secure to barbed fittings that are NPT and thread into cooler. Check these connections every so often as tranny fluid will decay these hoses and if they ever leak you could loose all your fluid with no indication until your transmission is ruined. Overall a good value for the money. Quality aluminum plate cooler made in Canada. Remedies General Motors original shortcomings in transmission cooling. Oregon Performance was prompt and sent a follow up survey. Good job guys.
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5
One bad transmission cooler
Mr. Ware
06/01/2020
Verified Buyer
Id like to say that when i heard about this transmission cooler i was all onboard. I own a 2001 chevy suburban 4x4 and i actually use it the way it was designed. Im an outdoorsman so it sees mud, snow, heat, dirt/dust, and towing. Original transmission with 200k+ miles so i wanted extra insurance while towing 7k lbs. I do not have a trans cooler temp gauge as of yet so i cant give specific numbers but she runs like a champ and shifts are smooth and on time. No dragging at all under heavy load. The customer service from Brian was nothing but the very best. It was very late at night (morning) and i needed the part shipped to the east coast faster than pronto and he made sure that i got it right on time and was able to install it and make my trip. Install was straight forward and little fabrication was required. The product works and works well and customer service is 2nd to none. Thanks again for your hard work proving to this 1st time customer that your company is one worthy of my business for the long haul!
7 of 7 customers found this helpful.
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5
2005 Chevy Silverado crew cab
John F
05/22/2020
Verified Buyer
Im very happy with this cooler. Easy installation and great shipping.
3 of 3 customers found this helpful.
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5
2011 GMC SIERRA
Charles
05/14/2020
Verified Buyer
Couldn’t be more happier, not only did the job/ still doing. But My temp dropped by around 25 degrees while pulling our camper, and simplify adding a longer life to my transmission. I wish I’d done this A LONG TIME AGO
5 of 9 customers found this helpful.
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5
Just buy it.
spencer
04/23/2020
Verified Buyer
Easy fit on my 2001 Silverado 1500. Minor drilling required and all the fittings needed included. Fast shipping.
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5
Amazing product for the best price.
Noah S
04/03/2020
Verified Buyer
I had previously ordered one from another retailer on eBay, and it came damaged from the brackets being on top of the cooler fins. I was delighted to see that your company had already foreseen the likes of this issue and took it out. Wrote a note explaining why and even some pointers on installation. I cannot thank yall enough and will link your page and this product Everytime somebody asks about a transcooler in the LS4 community. Thanks again 😁👍
8 of 9 customers found this helpful.
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5
89 GMC C7000 366 v8 Allison at540
Jason T.
03/26/2020
Verified Buyer
Purchased a 40k trans cooler for my work truck because no one makes a radiator for these trucks anymore with a built-in trans cooler. The cooler setup came with everything needed to install and the cooler is very well built. Shipping was fast great company to work with THANKS OREGON. Look for to doing future business.
3 of 3 customers found this helpful.
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5
Hi
Fran
03/24/2020
Verified Buyer
The delivery of my trans cooler was on time. The cooler itself was well packaged and in good condition when I opened it up. It was the exact sized cooler to replace my old one. Thank you for your service.
5 of 5 customers found this helpful.
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5
Question
Thatoneguy
02/20/2020
Will this fit a 2016 5.3 silverado?
1 of 1 customers found this helpful.
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5
2001 Chevy G3500 Van with 5.7 Vortec & 4L80E
Jake
01/27/2020
Verified Buyer
This van comes stock with a small oil cooler for the 4L80E trans and it used to heat up and shift hard in the mountains. On one particular pass the gauge would read about 185F. Now in similar conditions it reads 130F. This is a high quality unit and the mounting kit is really nice.
8 of 8 customers found this helpful.
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4
2007 2500 Dodge Ram 5.9 diesel
Blake Brovont
11/09/2019
Verified Buyer
I installed a 40k transmission cooler in my 2007 Dodge Ram 2500 5.9 diesel. It has been run at least 30 degrees cooler. So far I’m impressed.
13 of 16 customers found this helpful.
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5
Transmission cooler
Chris
10/29/2019
Easy install on a 2008 Yukon Denali. Fit great and had a 30 degree drop in transmission temp. I did buy a separate kit with custom brackets for GMC trucks, made install a snap.
13 of 13 customers found this helpful.
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5
Mission accomplished!
Sharon Tatum
10/08/2019
Verified Buyer
This trans cooler did exactly what I needed it to do! Lowered overall temp by 30-40 degrees.
8 of 9 customers found this helpful.
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5
Transmission oil cooler
Tom Langston
09/30/2019
Verified Buyer
Put Transmission oil cooler in 2010 Sierra 1500 to tow dump trailer. Install was a snap since heavy 1/2 ton had small one in place. About 3 times the surface area of OEM cooler and dropped operating transmission temp 20 % ( or about 35 degrees under load). Happy with purchase.
10 of 10 customers found this helpful.
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5
It just works
Lance
07/21/2019
Verified Buyer
I have a built Allison transmission in my 2011 Duramax; factor that in with the west Texas heat and the factory transmission cooler just couldn’t keep up. After installing the Tru Cool Max I’m seeing 30 to 40 degree lower transmission temperatures now! Great, effective, quality product. Highly recommended!
8 of 9 customers found this helpful.
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5
40k trans cooler
Isaac M Ramos
07/13/2019
Verified Buyer
I recently purchased a 40k transcooler for my 08 Chevy 2500 and man did it do exactly what I needed. My gauges changes 35-50 degrees cooler and I couldn't be any happier. Shipping was 5 days like planned. Thanks Oregon performance
5 of 5 customers found this helpful.
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5
OPT
TD
06/26/2019
Verified Buyer
Great cooler. Great Price. Well packaged arrived quickly. No damage THxs
4 of 4 customers found this helpful.
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5
Tru Cool 4739-1
David Farrell
05/02/2019
Verified Buyer
The cooler came quick and with no damage. Installation was easy. Trans is running so cool now I can't believe it. Great product. I should have done this years ago.
8 of 9 customers found this helpful.
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3
Large well made cooler - Hard to find AN fittings
Dejay
02/01/2018
Verified Buyer
The cooler is large and appears to be very well made. No doubt it is going to help keep everything cool. Only problem I had was the fittings on it are 3/8 inverted flare. I was not able to find fittings to convert this to 6-AN so installed it with the bard fittings that were supplied.
Very sorry for any issue you may have had. There are a few options on the inverted flare to -6 AN fittings. Russell brand, part number 640380 is a 5/8"-18 to -6 AN adapter that will work.
9 of 9 customers found this helpful.
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5
Fast shipping
G
12/21/2017
Verified Buyer
Shipped cooler right away. Nice product. Keeps my F250 cool.
2 of 3 customers found this helpful.
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5
Tru-Cool Max 40,000 GVW 4739-1 LPD47391
Dave N.
09/20/2017
Verified Buyer
Great Service, Great price, Fast Shipping, Cooler Arrived in perfect shape installed on my 2013 Silverado with some fabrication Huge difference in lowering the temperature Death Valley tested, I'm extremely Pleased Thanks OPT.
10 of 11 customers found this helpful.
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5
40.000 gvw Tru cool trans cooler
Bryan
06/03/2017
Verified Buyer
This 40k cooler fit with some fab work in in my 2008 sierra1500 very easy,Dropped trans temp from 195* to 160* works very good ran it inline with radiator cooler
6 of 8 customers found this helpful.
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5
Awesome Cooler
Ruben
05/14/2017
Verified Buyer
Awesome Cooler & Great service from Oregon Performance Transmission.
2 of 2 customers found this helpful.
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5
Best cooler ever
Ahmed Al-Abri
04/05/2017
Verified Buyer
the strongest cooler in the market unti now, amazing for hot desert climate and extreme sand driving. thanks oregon for the fast service.
4 of 4 customers found this helpful.
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5
NICE COOLER
CODY
02/10/2017
Verified Buyer
THE COOLER IS GREAT. JUST WHAT I NEEDED. SHIPPED RIGHT AWAY.
4 of 4 customers found this helpful.
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5
Top quality!
G.D.
02/03/2017
Verified Buyer
The Tru-Cool Max cooler fixed my customer's transmission overheat where the prior installed 10,000 pound RV cooler could not. The Tru-Cool Max design improved air flow through the radiator and dropped his engine temperature as well. The thermal bypass appears to be aircraft quality and allows quick warm up. Good mounting hardware too. In a separate class from common parts store coolers.
7 of 8 customers found this helpful.
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