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  #1  
Old 07-08-2018, 03:52 PM
Trooper13 Trooper13 is offline
230 Tornado
 
Join Date: Nov 29, 2016
Location: Georgetown, TX
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Transmission fluid cooler needed??

Hi there,

My son rear ended someone in my '88 GW and wrecked the grill, A/C condenser, transmission cooler, and radiator.

A/C didn't work anyway, so was not too worried about that. But since I had to get a new radiator anyway, I went with a heavy duty, 3 row. Takes up more room than the stock one, but fits OK.

Since I now have a larger radiator, do I even still need the extra transmission cooler? Or will running it just through the radiator do the job? I don't know if the extra cooler is stock or an add on/upgrade. I won't be towing anything if that matters.

Thanks!!
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  #2  
Old 07-08-2018, 06:53 PM
440sixpack 440sixpack is offline
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If you're not doing hard towing the add on cooler is a waste of time.
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  #3  
Old 07-09-2018, 08:52 AM
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tgreese tgreese is offline
 
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Yes, factory cooler in the radiator is fine for normal driving.
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  #4  
Old 07-09-2018, 12:15 PM
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letank letank is offline
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my take on this subject is an external cooler is a must, when you see how high the temp can go with an external cooler, and how slow the transmission oil temp decrease on a 3 mile downhill after a 3 mile uphill, I am seriously thinking of bypassing the built in radiator coolant fof the straight external cooler.

http://fsjnetwork.com/forum/viewtopi...=7473&start=40


Remember that vehicules are built to sustain their reliability not further than the covered warranty.
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74 wag, 349Kmiles on original ticker/trany, except for the rust. Will it make it to the next get together without a rebuilt? Status: needs a new body.
85 Gwag, 226 Kmiles. $250 FSJ test lab since 02, that refuses to give up but still leaks.

See Ouray 2013, Engine bits and Fuel and brake lines, and Body work

Last edited by letank : 07-09-2018 at 12:42 PM.
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  #5  
Old 07-10-2018, 07:55 AM
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babywag babywag is offline
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An external cooler is cheap insurance to keep an old tranny happier/longer.
Way cheaper than repairing one after overheating fluid.
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  #6  
Old 07-10-2018, 11:08 AM
ShagWagon ShagWagon is offline
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Aren't they like less than $20 and they even include zip ties to mount in front of your radiator?
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  #7  
Old 07-10-2018, 09:04 PM
Trooper13 Trooper13 is offline
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Quote:
Originally Posted by ShagWagon
Aren't they like less than $20 and they even include zip ties to mount in front of your radiator?
Yeah, they are pretty cheap. It's not the money. I figured it would just be one less thing that can leak if I didn't need to use that cooler.
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  #8  
Old 07-10-2018, 10:58 PM
440sixpack 440sixpack is offline
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Everyone knows more than the manufacturer it's always been that way.


Ditch the cooler if you're not heavy towing it's as necessary as most of the other JC Whitney treasures.
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  #9  
Old 07-10-2018, 11:14 PM
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PlasticBoob PlasticBoob is offline
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It depends on where you live. Down here where it regularly gets over 85*F, and pushing around 32" tires, I would definitely recommend it.

I have an 8-pass tranny cooler (with a 14" pusher fan on top of it) and a tranny temp gauge, and the cooler has made all the difference on warm days.

If you don't believe me, hook up a gauge or get an infrared thermometer and check the lines for yourself after a lot of stop-and-go or uphill freeway driving on a warm day: you'll find uncomfortably high temps, like I did.
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  #10  
Old 07-13-2018, 02:59 PM
Fasts79Chief Fasts79Chief is offline
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Join Date: May 09, 2018
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Always. Regardless of if you tow, or heavy loads, or whtever ... a trans cooler is mandatory on older vehicles in my opinion ... if you want your trans to live.

It's not a 'belt and suspenders' approach ... it's your pants.
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  #11  
Old 07-13-2018, 04:01 PM
Ristow Ristow is offline
 
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i usually bypass the rad cooler and just run an aux. cooler.
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  #12  
Old 07-16-2018, 06:57 AM
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tarriverarms tarriverarms is offline
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I thought the external cooler was stock? Getting ready to replace mine as the fins are loose and flimsy. Well actually going to repair AC and since the radiator has a busted weld on the mounting bracket I am going to replace all three coolers.

Is there one anyone can suggest or recommend over the other?
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  #13  
Old 07-16-2018, 08:59 AM
Ristow Ristow is offline
 
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stock on the tow package,as i recall. any of the hayden aftermarket are good.
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Ristows right.................again,




Quote:
Originally Posted by Fasts79Chief
... like the little 'you know what's' that you are.




Quote:
Originally Posted by Fasts79Chief
I LOVE how Ristow has stolen my comment about him ... "Quoted" it ... and made himself famous for being an ***hole to people. Hahahahahahahahahha!


→ Where the kids hang out...

fsjbuilder.org come for the mindless chat,stay for the hand drawn emoticons.

It's like you're unraveling a big cable-knit sweater that someone keeps knitting...and knitting...and knitting...and knitting...
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  #14  
Old 07-16-2018, 12:45 PM
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mattmopar440 mattmopar440 is offline
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Quote:
Originally Posted by Ristow
i usually bypass the rad cooler and just run an aux. cooler.

Same that way engine temp doesnt effect the transmission temp and if a external breaks u have a small fluid leak and if an internal breaks your normally looking at a transmission
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  #15  
Old 07-19-2018, 04:50 PM
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rang-a-stang rang-a-stang is offline
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Quote:
Originally Posted by PlasticBoob
If you don't believe me, hook up a gauge or get an infrared thermometer and check the lines for yourself after a lot of stop-and-go or uphill freeway driving on a warm day: you'll find uncomfortably high temps, like I did.
Where did you hook up your gauge sensor? Trans pan? Cooler input? cooler output?
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  #16  
Old 07-20-2018, 07:00 PM
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tarriverarms tarriverarms is offline
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Quote:
Originally Posted by rang-a-stang
Where did you hook up your gauge sensor? Trans pan? Cooler input? cooler output?

What do you mean by a gauge sensor?

Do you mean like a temp sensor for your trans? I was wondering if that is possible. Would like to know the specifics of this as well.
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  #17  
Old 07-20-2018, 07:30 PM
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letank letank is offline
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for the tf727, here it is

http://fsjnetwork.com/forum/viewtopic.php?f=7&t=7473

need to find the plug for the th400
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Michel
74 wag, 349Kmiles on original ticker/trany, except for the rust. Will it make it to the next get together without a rebuilt? Status: needs a new body.
85 Gwag, 226 Kmiles. $250 FSJ test lab since 02, that refuses to give up but still leaks.

See Ouray 2013, Engine bits and Fuel and brake lines, and Body work
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  #18  
Old 07-21-2018, 03:01 AM
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PlasticBoob PlasticBoob is offline
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Quote:
Originally Posted by rang-a-stang
Where did you hook up your gauge sensor? Trans pan? Cooler input? cooler output?

I bought a B&M gauge kit, and installed it on the top (return) line close to the transmission.

The kit told me to hack the line and install a T fitting in between it, with the sensor plugging into the T. Been over a decade and it hasn't leaked yet, but it does concern me.

I think guys running oversized tires with high gearing would greatly benefit. For example, I have 32" tires with 3.07 gears.

Before I installed the cooler, I was offroading and my tranny generated so much heat that the cooling system and engine quickly overheated. So I installed a huge cooler and pusher fan to absorb the extreme heat generated from torque multiplication when going over obstacles slowly off-road (or stop-and-go traffic on hot Southern California days). Zero heat issues since.
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1974 Cherokee S, fuel injected 401, Trans-am Red, Aussie locker 'out back'
Click for video

The Southern California FSJ forum

Last edited by PlasticBoob : 07-21-2018 at 03:30 AM.
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  #19  
Old 07-21-2018, 06:55 PM
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tarriverarms tarriverarms is offline
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Does anyone by chance know the cooler line hose size?
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  #20  
Old 07-21-2018, 11:32 PM
wiley-moeracing wiley-moeracing is offline
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3/8"
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