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Unread 01-19-2009, 07:43 PM   #1
the88thpianoman
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Need to put in a transmission cooler

I occasionally tow, up to 5000 pounds, so I figure I should stop abusing my transmission as I do not have the factory tow package. Does anyone have any recommendations as to where I should purchase one, or how to select one? Am I correct in thinking that you can't really go overkill on it? Approximately how large of a cooler can I fit, and does anyone have a link to an install write up?

I pretty much just need some basic schooling on this one. Thanks for any input.

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Unread 01-19-2009, 07:47 PM   #2
shdybrady19
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Being you live in florida you can not go over overkill really. Just buy one from b&m. Get something about 24000- 36000 gvw. also why you are down it wouldnt hurt, if you have the money that is, to put a deeper transmission pan. The add fluid capacity with that and the cooler will save your tranny for along time. But if you do go far up north to visit family and stay for a good bit. let the fluid warm up before in use. And if you make the trip often or decide to move you can actually install a thermostat in the line and it would prevent being too cold
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Unread 01-19-2009, 07:49 PM   #3
JrMechanic
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You CAN go overkill on a transmission cooler. Some people say the bigger you go, the better, however, thats NOT true. Your transmission needs to achieve operating temperature just like your engine does. Running too cool can be just as bad as running too hot. A good rule of thumb is to take your total combined vehicle and trailer weight, then find a cooler that is around 2 times that capacity.

EDIT: Oh yeah, one more thing: You don't really need anything fancy, a $30 dollar cooler from your local parts store works fine.
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Unread 01-19-2009, 08:02 PM   #4
the88thpianoman
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Well, the coldest weather my transmission sees is about 40 degrees. On the other hand, towing 4-5000 pounds in 90 degree weather is not an incredibly uncommon occurrence. The furthest north I'll go even occasionally is north carolina, and not during the winter. Would I be better served by the $40 tube and fin cooler (specifies for SUVs towing up to 5k pounds), or the $70 radiator style cooler (specifies for up to motorhomes towing 10k pounds).

The $30 cooler at my local parts store only claims to help for cars towing up to 2.5k pounds.

Edit: I can't really justify the cost of adding a deeper transmission pan (even though I'd like to), but I would like to track down one of the drain plug kits to install in my stock transmission pan.
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Unread 01-19-2009, 09:36 PM   #5
robertg
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i've got a b&m 70268 in my astro van. i think it's rated to 19k gvw?

i paid $35 for my 70268 kit last year on ebay.

here's a writeup i found by googling "b&m 70268" on jeepin.com it uses a cherokee, but installation should be similar

http://www.jeepin.com/features/trannycooler/

trying to remember, but i think the highest temp i saw after the cooler install was 200 degrees, while pulling my camaro on a uhaul trailer (about 5500 lbs) up a steep incline in city traffic. highest i saw on the highway was 180-ish.
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Last edited by robertg; 01-19-2009 at 09:48 PM..
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Unread 01-19-2009, 10:03 PM   #6
xJoshxx
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Pianoman do this to your Wj and Make a Up to Date write up cause i do tow a decent about with the boat. and dont wanna go cutting into lines just yet
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Unread 01-19-2009, 10:50 PM   #7
robertg
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how do the factory jeep lines install into the cooler? i know on my astro van, the lines install into quick disconnect fittings that thread right into the radiator.

the b&m 70268 kit gives you a 3/8" npt hose barb fitting that threaded right into my van's radiator. i put that barb fitting in the radiator, then ran the supplied hose around the front of the core support into the cooler. from the output side of the cooler, i ran more hose over to a 3/8" npt tee. i used one of the ports for the fitting for my trans temp gauge. i'll have to take a picture or two of the finished install of my setup in my van, at least to give an idea for routing.

i intend to get the same cooler for our jeep at some point.
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robert's van- 2000 Astro 4.3 V6 - 4L60E - 3.42 10bolt
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Unread 01-19-2009, 11:15 PM   #8
xJoshxx
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there not quick disconnect i believe ive seen coolers with people spliceing the OEM tranny lines and T barbed fitting and others idk.
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Unread 01-20-2009, 05:09 AM   #9
JrMechanic
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I dunno about WJ's, but on ZJ's they use the quick connect fittings.
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Unread 01-20-2009, 11:58 PM   #10
the88thpianoman
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For anyone who is interested, I took the suggestion of the B&M model #70268 as a starting point for doing some research on tranny coolers. After looking at a lot of options, I went ahead and bought the 70268 from summit racing for just under $60 shipped.

Now, does anyone know how to make it really easy to disconnect/reconnect the hoses so that I can use the cooler as the hookup point to flush the transmission?

I probably will do a write up of the install since it was so hard to find one to begin with.
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Unread 01-23-2009, 09:42 PM   #11
robertg
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that b&m 70268 cooler has barb style fittings for connection. all you'd have to do is unhook a hose, then put your flush machine (or other device) in series. then remove the flushing device, and reinstall the hose in the proper position.


i'll have my van back this next week, and i'll try to remember to pop my grille out and show the semifinished install. i still have to hook up my temperature gauge, and i want to order another temp sender to put at the output of the transmission before it hits the cooler. i want to put the two senders on a switch so i can look at either temp without installing another gauge.

i also picked a blown transmission line out of the dumpster at work (rubber section blew out) that had the same style quick disconnects on the steel line ends as what my van has. i intend to do away with the majority of the rubber hose at some point because i think the steel line would look more neat, professional.
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robert's van- 2000 Astro 4.3 V6 - 4L60E - 3.42 10bolt
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Unread 08-12-2009, 08:40 PM   #12
MACHJGC
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any write ups on this yet OP?
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Unread 08-13-2009, 08:39 AM   #13
HighLonesome
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I have that B&M 70268 in my 94 ZJ. It's rated at 18,000 GVW. My trans went up to 230 degrees climbing a mountain offroad last weekend. It was a hot day. The hill ended or I think the temps would have went higher. My temp sensor is located in the pan.

I have an aluminum finned trans pan and the 5.9 efan, which stays on low all the time under about 30mph. I'd go a little bigger if you go offroad in hot climates. I'm thinking of the 20 or 22 thousand GVW one of these:

http://www.transmissioncoolers.us/Me...=tru-cool-thin
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Unread 08-18-2009, 02:04 PM   #14
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I just put on a 18,000 lb Tekonsha SR (self-regulating) cooler. It has 3/8 fittings on it and includes hose and clamps and mounting hardware. There is a section of rubber hose (approx 12") in the factory line leading from the radiator back the tranny. I removed that hose. I connected on side of the tranny cooler to one end of that now open steel tranny line and the other side of the cooler to the other end of that steel tranny line. Essentially the cooler just splices in line between the radiator and the tranny. No lines to cut and no special fittings to thread in.
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