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Thread: adding a tranny cooler to a 1500
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02-17-2014, 12:11 PM #1
adding a tranny cooler to a 1500
My buddy has a 1500 z71. He's borrowing another of our buddy's camper and going on vacation with me this year to VA Beach. I'm trying to get his truck all set up for him. I told him getting an aftermarket tranny cooler probably isn't a bad idea since we'll be hauling in August up and down hills. I haven't had a chance to look under his hood yet but I'm guessing he just has the tranny lines running through the radiator. Anyone know which is the return line to the tranny right off hand? I'm gonna guess the output line from the tranny has high pressure fittings and the return might not but if anyone knows which line is which it might save me some time.
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02-17-2014, 05:15 PM #2
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- Apr 2008
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- Madison, WI
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- 7,006
1999 Formula WS6 M6-sold- 2001 Silverado Z71
All the fittings are the same (supply and return). I'm 99% sure the bottom line at the rad is the return back to the trans
-------------------------------------Kooks 1 7/8" race headers, Kooks ORY, Borla catback, Nitto 555R, LS6 intake manifold, Shaner S3 ported stock throttle body, SLP lid, smooth bellows, JAAM Ram Air kit, Elite Engineering catch can, LS6 valley cover, EGR and AIR deleted, Frost tune, and Simpson Racing child car seat in the back. 13.2 @ 108MPH
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02-22-2014, 09:10 PM #3
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Black / Stryker Blue- 2K WS.6/ 2K9 G8GT
Drive it a bit, then feel the trans lines, one should be noticeably cooler than the other, the cooler of the two is the return.
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02-23-2014, 07:45 PM #4
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Silver & Blue- 02 Camaro SS, 04 GTO
I'm not too sure that it matters when adding a trans cooler because more are a straight through type system without any restrictions so the fluid should just go in one end, go through the cooler and come out the other end. If it is any different I would like to know.
My ride is a 2002 Camaro SS SLP #3296 with 30k, LTH, 3" Y, CME, Frost tune, K&N, ported TB, Blackwing lid, Bellows, MSD, Denso Iridium, and 85mm MAF, Bilsteins, Eibach springs, SLP strut brace, Adj. Panhard, TA Girdle, UMI, Pro 5.0, Nitto NT555
My wife has a 2004 GTO with the rare SAP, 18" wheels, K&N Cold Air System, MSD, Ported TB, Frost tune, Denso Iridium, Flowmaster cat-back, 3200 Yank, 75k
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02-23-2014, 08:22 PM #5
I would rather cool it on the return because the radiator has already dropped the fluid temp some and then the cooler drops it more. Going the other way the best case scenario you're looking at are stock tranny temps. Not that stock temps are a bad thing but the cooler you can keep the tranny the better it is for it to a point.
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02-24-2014, 02:26 AM #6
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Black- 2000 WS6 6spd Hooker LT
Yes put the aftermarket cooler on the return line. This way if the aftermarket is more efficient, you won't warm the fluid back up going thru the radiator.
I found out that if you are in the driveway, and powerbrake the car without spinning the wheels for 15 seconds or so (or smoke 'em if you want!) then quickly feel the lines, you will find which one is cooler. Just don't burn your hand by grabbing the line too tightly, ask me how I know that lol.
All trans lines that I've encountered have the same type connection on the inlet side of the cooler and the outlet, unlike a power steering system connection at the pump.
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02-24-2014, 06:36 AM #7
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02-24-2014, 06:39 AM #8
We have an aftermarket cooler in front of the radiator and it works great. Our Suburban has a factory trans temp gauge and even towing our car hauler up hills on a hot day, we rarely see temps above 200 degrees. For the most part, it runs in the 150 to 180 degree range.
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02-24-2014, 06:50 AM #9
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Silver & Blue- 02 Camaro SS, 04 GTO
Why do manufacturers run the transmission fluid through a hot radiator and not through a radiator mounted cooler.
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02-24-2014, 09:58 AM #10
because getting heat into the tranny is just as important as keeping it from being too hot....that's why I added the "to a point" in my other post. The radiator helps bring that tranny temp up faster and maintain it once it's there in a stock setting but when you start towing that's when it can get out of hand. Have you ever noticed how hard a tranny will shift in cold weather? The pcm's also will keep the converter unlocked when it's cold to help heat the tranny up quicker. On my durmax it's more than obvious when the tranny isn't up to temp. Ideally that 180 area is where you want to keep the fluid....personally I'd like that to be the landing spot for temps while towing. My d-max maintains 180-190 towing during the summer. I'm not sure on the gas burners because I've never messed with a 1500. I will still put that cooler on the return side though.
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