Trans coolers

[caryt]

I'm looking at 2 different ones, the CSF, #8344 34% Larger Core Volume and 68% more Fluid Volume and the Mishimoto, MMTC-JL-18SL 93% increase in external tube area and 32% overall fin area .

The info they provide doesn't allow comparison so who knows witch one will provide the most cooling.

Anyone install one and has temp drops?

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[Bandit’s Lair]

Not that particular item, but I’ve run Mishimoto products in the past on different vehicles. They’ve always been really good quality on the construction side and function side.

 

[CrazyCooter]

I haven't felt the need for an upgraded trans cooler? Temps seem to be pretty consistent and only climb a couple of degrees on hard climbs, towing heavy, and in temps over 100°?

I feel like if I was given a trans cooler for free, I would never install it?

 

[Vtur]

Highest i’ve seen mine is 220 degree while climbing switchbacks up to 10k feet elevation.

 

[CrazyCooter]

Highest i’ve seen mine is 220 degree while climbing switchbacks up to 10k feet elevation.

I cant say I've even seen mine that high.......seems like 205-208 sustained while towing heavy at 100°ish ambient, climbing to maybe 217° on some hard pulls, but drops right back down to 205° afterwards.

Now if a trans cooler could reduce heat load from the coolant or transfer heat out.......I'd be in! New low temp thermostats or thermostat deletes are pretty common for the Rams and Grand Cherokees, but I haven't seen anything offered for a JL/JT? May be interchangeable, but wouldn't they be marketed as such if it was?

 

[Bandit’s Lair]

Now if a trans cooler could reduce heat load from the coolant or transfer heat out.......I'd be in!

Ok……. If this isn’t what an aftermarket transmission cooler does then I’ve been duped for the last 25-30 years of my life. Did I miss a memo again?

 

[CrazyCooter]

Ok……. If this isn’t what an aftermarket transmission cooler does then I’ve been duped for the last 25-30 years of my life. Did I miss a memo again?

What good is a larger cooler when there is a "Warmer" inline that will regulate the temp anyway? Have you not noticed the trans temp is pretty much the same at 10° as it is at 100°? Jeep designed the system to run about 200°?

A more efficient cooler may actually do nothing if installed by itself?

 

[Bandit’s Lair]

The warmer only warms to nominal operating temp. 140-190(?) to my understanding. Then it becomes a heat exchanger/extractor. If a transmission cooler can keep it closer to that range than the 200+ I’d think it is worth it. Most of em add a bit more fluid as well so that’s a bonus to longevity. This is all going to be user subjective though.

 

[CrazyCooter]

The warmer only warms to nominal operating temp. 140-190(?) to my understanding. Then it becomes a heat exchanger/extractor. If a transmission cooler can keep it closer to that range than the 200+ I’d think it is worth it. Most of em add a bit more fluid as well so that’s a bonus to longevity. This is all going to be user subjective though.

Try it and let us know!

I haven't replaced the radiator or trans cooler because I'm not convinced it will result in anything more than a lighter wallet?

I've also pretty much quit traveling with a load when it's over 100° these days.

 

[CrazyCooter]

Another thing that makes me think that a more efficient cooler alone would be a waste is that trans temps don't track with coolant temps? When coolant has hit 248° in the past, trans is still under 220°?

 

[kb5zcr]

Here you go.

 

[caryt]

Every single trans in every truck car etc has a system, usually rad fluid to heat the trans fluid to normal operating temps. Then the trans fluid goes to a air to fluid cooler. As shown 220*+ isn't normal or recommended. I want the largest best cooler I can fit to maintain 200* or lower under any conditions where I travel.

 

[willys 41]

I'm looking at 2 different ones, the CSF, #8344 34% Larger Core Volume and 68% more Fluid Volume and the Mishimoto, MMTC-JL-18SL 93% increase in external tube area and 32% overall fin area .

The info they provide doesn't allow comparison so who knows witch one will provide the most cooling.

Anyone install one and has temp drops?

If you want to keep all temps down, coolant, oil and trans install a RPM Extreme JL fan controller.
You will be amazed at how well it works keeping all temps down.
I have been running one for 3 years now and my coolant and oil temps are down by 25 to 30 degrees.
Your jeep has a transmission heater so you will always see temps about the same as the coolant.


A Mopar transmission heater (also known as a transmission warmer or heat exchanger) works as an oil-to-water thermal regulator. It circulates hot engine coolant through a series of passages directly adjacent to the transmission fluid to maintain optimal fluid temperature and viscosity. [1, 2, 3, 4, 5]

How It Operates

• Cold Starts & Warm-Up: When the engine is started in cold weather, the transmission fluid is thick, which causes sluggish shifting and increased wear. The heater uses the rapidly heating engine coolant to quickly warm the transmission fluid to its ideal operating temperature. [1, 2, 3, 4, 5]
• Thermal Bypass Valve (TBV): A built-in thermostat controls the flow. It directs transmission fluid through the heater until it reaches roughly 180°F (82°C). Once the fluid reaches this threshold, the TBV routes the fluid to the external transmission cooler to prevent overheating. [1, 2]
• Cooling Mode: If the transmission works hard and exceeds engine coolant temperatures, the heat exchanger works in reverse, allowing the cooler engine coolant to absorb excess heat from the transmission fluid to prevent it from overheating. [1, 2]

If you are experiencing issues with your transmission heater—such as a coolant leak, a check engine light, or harsh shifting in the cold—provide the model and year of your vehicle to help determine if the thermostat or heat exchanger needs to be

https://store.mopar.com/oem-parts/m...0PdLuwF91hQpZ3xquKYmrhPzDGXe8hj4aAgm5EALw_wcB

http://www.rpmextreme.com/Product/311/Jeep-JL-JT-PWM-FAN-CONTROLLER-⭐.aspx

 

[Old Dogger]

I reside in hot as hell Phoenix. The factory installed coolers on my Jeeps, seem to do an excellent job of cooling. Just keep the bugs externally flushed out of them, and the factory trans cooler will cool just fine.

 

[Stan H]

If you want to keep all temps down, coolant, oil and trans install a RPM Extreme JL fan controller.
You will be amazed at how well it works keeping all temps down.
I have been running one for 3 years now and my coolant and oil temps are down by 25 to 30 degrees.
Your jeep has a transmission heater so you will always see temps about the same as the coolant.


A Mopar transmission heater (also known as a transmission warmer or heat exchanger) works as an oil-to-water thermal regulator. It circulates hot engine coolant through a series of passages directly adjacent to the transmission fluid to maintain optimal fluid temperature and viscosity. [1, 2, 3, 4, 5]

How It Operates

• Cold Starts & Warm-Up: When the engine is started in cold weather, the transmission fluid is thick, which causes sluggish shifting and increased wear. The heater uses the rapidly heating engine coolant to quickly warm the transmission fluid to its ideal operating temperature. [1, 2, 3, 4, 5]
• Thermal Bypass Valve (TBV): A built-in thermostat controls the flow. It directs transmission fluid through the heater until it reaches roughly 180°F (82°C). Once the fluid reaches this threshold, the TBV routes the fluid to the external transmission cooler to prevent overheating. [1, 2]
• Cooling Mode: If the transmission works hard and exceeds engine coolant temperatures, the heat exchanger works in reverse, allowing the cooler engine coolant to absorb excess heat from the transmission fluid to prevent it from overheating. [1, 2]

If you are experiencing issues with your transmission heater—such as a coolant leak, a check engine light, or harsh shifting in the cold—provide the model and year of your vehicle to help determine if the thermostat or heat exchanger needs to be

https://store.mopar.com/oem-parts/m...0PdLuwF91hQpZ3xquKYmrhPzDGXe8hj4aAgm5EALw_wcB

http://www.rpmextreme.com/Product/311/Jeep-JL-JT-PWM-FAN-CONTROLLER-.aspx

How difficult is that to install, I am a busy wiring guy

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