Aux Trans Cooler with Fan OPTIONS

thompsoj22 · Jul 11, 2020

gooffeyguy said:
When doing that lower grill cutout, can you still mount a license plate?

Sent from my SM-G930V using Tapatalk

Yup, I left the plastic bosses intact. I will extend the plate out maybe an inch to allow more airflow. The aux fan is designed to not need ram air at all so you can mount anywhere there is space and unrestricted air. I may mount the license plate using the two lower mount holes and have the full ram air effect at speed and possibly stay below the 180 f fan on/off thermostat switch. In this position the plate is level with the lower air dam/trim piece.

thompsoj22 · Jul 11, 2020

Tim907356 said:
Well we are on parallel paths my friend! I have another thread on the same subject so I won't bore with the details found there: "Transmission Stumble". I am installing a Tru-Cool 30k auxiliary cooler inline with factory unit, behind the lower fascia. It will be passive though; no fans. Here are some pics below. The one question I have for the audience is,
Which factory line is 'send', and which is 'return'?

View attachment 251973 View attachment 251974 View attachment 251975

Top line out of the radiator is return to trans.

Tim907356 · Jul 13, 2020

Yeah, this is uncanny timing. And good to see much of the same thinking on cooler/cooling mods. I had intended a TC 40k cooler, but the 30k barely fit between the chassis beams, so I'm glad I got what I got.
I don't need a front tag in SC, so if more cooling is needed, I'll probably put a scoop in or just under the spoiler to direct air up to the cooler.

"flows from the tranny, to the radiator, to the factory cooler, back to the tranny."

"Top line out of the radiator is return to trans."

...Do we know which one of these is correct?
I cut the line from the top of the radiator, and installed the cooler in line. I intended it to be the first thing the fluid hit, before the radiator and factory cooler. I can change it if needed, but I don't like cutting and coupling lines....

So, results. I took it out for a couple of test spins, and then to Church yesterday; 1/2hr. each way. Temp was ~85F, and the tranny temp got to 145F. Not exactly the result I hoped for, but at least it doesn't leak, and is ~25F cooler than before. I'm going to get it serviced (fluid/filter), and then go camping for the real test.

1BADI5 · Jul 13, 2020

I'm running the Tru Cool 40k in the stock location (I modified the lines and trimmed some stuff)

NO extra fan for me, but I also went with the B&M aluminum deep pan; holds an extra 2 qts of trans fluid. Also replaced all of the trans cooler lines and new filter and fluid while I was in there.

Its been in the upper 90s here the last 2 weeks and my trans temps at their highest has been 138*, normally 118-129* cruising

randeez · Jul 13, 2020

i tried a derale 15840 dual fan one under the cab and it didnt work all the well...went back to a trucool 40k in the lower grill, same mod up a few posts.

@Tim907356 the top should be the return to the trans, i would leave it how you have it though. let fluid hit the stock cooler first (air to water) is efficient but will never lower temp below the coolant temp (195-200). then send fluid to the aux cooler (air to air) that flows ambient temp through the fins - and 145 temp for trans fluid is great, what were you expecting?

Tim907356 · Jul 16, 2020

I was hoping to keep it in the 130's, without towing. I know it'll increase on a heavy haul. It previously ran ~170-175F, but then up to 240 in the hills, with a 5000# trailer behind.

I just got it out of service for a filter & fluid change. From the symptoms, the guy said the torque converter is failing, and that's why it flutters, stumbles, and overheats. He said they all fail, but it could ruin the tranny if I don't replace it...$1700 or so. It only has 130k mi. ???

1BADI5 · Jul 16, 2020

If your going to replace the converter, call Circle D and get one of their built billet units. Would ba bulletproof item on a pretty much stock truck.

thompsoj22 · Jul 16, 2020

Tim907356 said:
Yeah, this is uncanny timing. And good to see much of the same thinking on cooler/cooling mods. I had intended a TC 40k cooler, but the 30k barely fit between the chassis beams, so I'm glad I got what I got.
I don't need a front tag in SC, so if more cooling is needed, I'll probably put a scoop in or just under the spoiler to direct air up to the cooler.

"flows from the tranny, to the radiator, to the factory cooler, back to the tranny."

"Top line out of the radiator is return to trans."

...Do we know which one of these is correct?
I cut the line from the top of the radiator, and installed the cooler in line. I intended it to be the first thing the fluid hit, before the radiator and factory cooler. I can change it if needed, but I don't like cutting and coupling lines....

So, results. I took it out for a couple of test spins, and then to Church yesterday; 1/2hr. each way. Temp was ~85F, and the tranny temp got to 145F. Not exactly the result I hoped for, but at least it doesn't leak, and is ~25F cooler than before. I'm going to get it serviced (fluid/filter), and then go camping for the real test.

Both are correct, the lower line into the radiator is from the trans the top line from the radiator than routes to the aux cooler and back to the trans.

Tim907356 · Jul 16, 2020

I'll look at Circle D, but I'd rather avoid shared liability....no one will own anything if something goes wrong!

thompsoj22 said:
Both are correct, the lower line into the radiator is from the trans the top line from the radiator than routes to the aux cooler and back to the trans.

True, if you consider that, "Top line out of the radiator is return to trans." omits that it flows through the cooler before the trans., which was the gist of my question.

thompsoj22 · Jul 17, 2020

randeez said:
i tried a derale 15840 dual fan one under the cab and it didnt work all the well...went back to a trucool 40k in the lower grill, same mod up a few posts.

@Tim907356 the top should be the return to the trans, i would leave it how you have it though. let fluid hit the stock cooler first (air to water) is efficient but will never lower temp below the coolant temp (195-200). then send fluid to the aux cooler (air to air) that flows ambient temp through the fins - and 145 temp for trans fluid is great, what were you expecting?

Just finished mine, Left the radiator in the circuit and average temps normal driving 145 to 165f. The thermostat on the Derale fan is 180 and im thinking that while im towing and hit the 180 mark the fan on the cooler will have a tough time controlling the trans temp? Add to this the engine coolant increasing simultaneously and it makes sense to go back in and plumb as a stand alone and eliminate the engine coolant influence. What didnt you like about yours? In hindsight im pretty sure that if you ordered a 8an 25 row stacked plate cooler without fan it would litterally attach to the OEM connectios for the standard 9 row cooler, No cutting of the lines at all.

Aux Trans Cooler with Fan OPTIONS

thompsoj22

Full Access Member

thompsoj22

Full Access Member

Tim907356

Member

1BADI5

randeez

Full Access Member

Tim907356

Member

1BADI5

thompsoj22

Full Access Member

Tim907356

Member

thompsoj22

Full Access Member

Similar threads

Forum statistics

Latest posts