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Old 08-16-2019, 12:52 PM
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Transmission coolers

I tow a small utility trailer (5 X 8) for vacation. I have never had a problem but I keep looking at transmission coolers. Should I install one? Is it necessary?

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Old 08-16-2019, 02:18 PM   #2
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Highly recommended if you have an auto. I recently installed a reman 32rh and one of the warranty requirements was to add a trans cooler that bypasses the OE which flows through a lower radiator chamber.

I purchased an Imperial from Carquest and like it. I got a model with heavy-gauge fins so that I could mount it externally. Under $100.

Trans Cooler by GhostCreekMine, on Flickr

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Old 08-16-2019, 02:23 PM   #3
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I installed a cooler on my LJ, but had no evidence that my transmission was running hot. I installed a B&M Super Cooler #70264. Cost was about $100. I only had to remove the right side headlight to slide behind the grill.

I don't know what year your Jeep is, but if you have the 42RLE transmission, a better option would be to regear your axles to match your tire size, if you're running larger tires.
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Old 08-16-2019, 02:24 PM   #4
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I installed a B&M 70264 on my '06 Unlimited automatic. It seems to be a lot less temperamental than it use to be and from everything I have read, it can definitely prolong the life of the 42RLE.
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Old 08-16-2019, 06:06 PM
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I have an 06 Jeep wrangler. 30 In tires
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Old 08-17-2019, 09:50 AM   #6
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OP, what trans do you have. if its an auto 06 that means its a 42RLE and should have a trans cooler on it. if nothing else it will greatly increase the life of the ATF.

I run the PSC model that has two cooler, one for trans and one for PS. a standard B&M model runs ~$50 and can be installed behind the grill with minimal frustration.

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one of the warranty requirements was to add a trans cooler that bypasses the OE which flows through a lower radiator chamber.
did they really state to bypass the radiator? that seems a bit counterproductive as the radiator helps warm up the trans in the cooler months.

although I have seen plenty of goofy recommendations from parts manufacturers.
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Old 08-17-2019, 10:22 AM   #7
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did they really state to bypass the radiator? that seems a bit counterproductive as the radiator helps warm up the trans in the cooler months.
Actually, they give the option of installing a bypass cooler OR replacing the OE radiator.
My existing radiator is relatively new (2yrs) so I wasn't interested in replacing it again. I've never felt that it did an exceptional job of cooling the tranny fluid anyway, adequate at best. I opted to keep my radiator and add the cooler. I've always wanted to do it, this was finally the incentive that pushed me over the edge.

2019-08-17_08-21-43 by GhostCreekMine, on Flickr
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Old 08-18-2019, 10:42 AM   #8
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Even if you don't tow, you should have a transmission cooler on any 42RLE equipped Wrangler. They have a tendency to run hot, especially when wheeling or driving at slow speeds. As others have said, the B&M 70264 is one of the best choices for the Wrangler TJ/LJ. It's a stacked plate design cooler and is very efficient at cooling the 42RLE. Frankly, they should have put a cooler on these from the factory. The 42RLE gets a lot of bad press, but if you keep them cool they will perform better and last a long time. I've run this same setup on multiple Jeeps and it has worked extremely well. The only thing I would do differently is to install a new transmission pan with a drain plug and install a transmission temperature gauge. This is next on my list.

As far as the install, it's a pretty easy job. The B&M cooler easily fits through the driver side headlight opening. You will need to remove the entire headlight assembly to get it to fit though. Some argue about whether to bypass the radiator, but I called B&M when I did mine and they said to run it through the radiator cooler. That said, it goes from the transmission, to the radiator, from the radiator to the cooler, then back to the transmission.
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Old 08-18-2019, 11:08 AM   #9
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Any need to install an inline thermostat valve?
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Old 08-18-2019, 01:24 PM   #10
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Not sure what an inline thermostat valve is, or what it would do. There is a check valve integrated into the OE line system that must be maintained.
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Old 08-18-2019, 01:46 PM   #11
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Not sure what an inline thermostat valve is, or what it would do.
A thermostat would prevent flow through the cooler when cooling was not required. Some coolers are already equipped with a low temperature bypass.

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There is a check valve integrated into the OE line system that must be maintained.
Evidently, said maintenance was overlooked when the schedule of recommended maintenance was created. So, please share details about the check valve maintenance requirements.
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Old 08-18-2019, 01:51 PM   #12
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And this (prevention of flow) would not cause excessive trans oil pressure? My knowledge is limited when it comes to torqueflite transmissions... which is what the 32rh is, I believe... so forgive me if I'm wrong. Still learning. Maybe different for his '06 transmission.
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Old 08-18-2019, 02:13 PM   #13
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Evidently, said maintenance was overlooked when the schedule of recommended maintenance was created. So, please share details about the check valve maintenance requirements.

By "maintained" I mean KEPT IN THE LINE SYSTEM when adding a cooler..,. or... "maintain" its integral role in the system, get it? I guess I left a dangling participle for you to chew on, glad you enjoyed it.

If you want to "perform maintenance" on the check valve there is no officially documented procedure for cleaning or unclogging it that I'm aware of. It's a spring and a ball set into a line fitting. Just replace the little bugger if it's not functioning well.


Please post a link to the "transmission thermostat valve" you speak of, I'm really curious about that. Maybe I should get one, maybe we all should?
Thanks!
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Old 08-18-2019, 03:01 PM   #14
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Basically just a fluid bypass valve that returns fluid to the transmission (bypassing the cooler) when temps are below 180 degrees.

https://www.amazon.com/Derale-13011-.../dp/B004XONNRQ
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Old 08-18-2019, 03:10 PM   #15
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Interesting, I like the idea... bypassing the bypass cooler when warmer op temps are beneficial. Extremely cold winters where I live and it might work well for me. I'm about halfway sold on this idea now. hmmm
The one you pictured indicates 180 degrees as its threshold. Not sure what the optimal op temp is on my 32rh, more research required (on my part).
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Old 08-18-2019, 03:42 PM   #16
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Earls makes one that I believe is set at 160 degrees and has three sensor ports so you could read trans fluid temp from it
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Old 08-18-2019, 05:12 PM   #17
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I was curious, so I looked up Earls. I think Earls is out of Australia? They want over $100 for their version of the product and the amazon reviews indicate thread issues/problems with their fittings and poor customer service. I'd probably go with the $50 USA made one that you first pictured if I was so inclined. Maybe add an aftermarket temp sensor/gauge independently. I still don't know what the ideal op temp is however.
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Old 08-18-2019, 05:16 PM   #18
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Please post a link to the "transmission thermostat valve" you speak of, I'm really curious about that. Maybe I should get one, maybe we all should?
Thanks!
After taking a look at your cooler installation job, I would recommend that you refrain from any additional modifications to your vehicle.
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Old 08-18-2019, 05:21 PM   #19
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Talking

LMAO

Puhleeeze.... go back to pirate, you belong there.

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