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Old 03-08-2008, 06:04 PM   #1
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How To Install Auto Tranny Cooler ?

Hello.

Today I ordered this auto tranny cooler: click me



I only know that I need such an additional tranny cooler because my ATF becomes too hot on some hot days in the summer.
But I dont know how to install it.

Do I install it instead of the stock tranny cooler? Or together with the stock tranny cooler in a row? Which one should come first in the row? The new or the stock cooler?

Where do i mount this new cooler? In front of the stock water/AC cooler?
Is the stock big cooler still strong enough with the new cooler in front of it?

How do I install a tranny oil temperature sensor? With a T-piece in the hose from the tranny to the cooler?

Is anybody here at WF who already installed such an additional ATF cooler in his TJ? Could you please post some pics of that or better make a little write-up?

Iīd appreciate all other suggestions and advices.

Thanks in advance.
nicolas-eric

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Old 03-08-2008, 06:16 PM   #2
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Connect it to the output of the factory cooler as it comes out of the radiator. The output of the OE cooler is on the right side of the radiator as you are sitting inside looking forward towards the radiator. Run the output of the tranny cooler leaving the radiator directly into the input of your aux cooler, and the output of the aux cooler back to the hard line that goes back to the tranny and secure it with a clamp.

How do you know it is getting too hot?

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Old 03-08-2008, 06:29 PM   #3
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in stop-and-go traffic with temperatures above 90F i have the problem that the tranny shifts very rough after turning the engine of and on again after 5-10 minutes after shopping. it needs about 2-3 minutes then with running engine at idle speed (the belt-driven fan is very loud and is full engaged) until the tranny shifts normal and soft again.
on the highway with higher speds i donīt have this problem.

different jeep garages said that itīs a temperature problem. but they wonīt fix that on warranty and say thatīs normal...
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Old 03-08-2008, 06:57 PM   #4
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For the sender put it a tee fitting on the hot side of the cooling loop.Then put the sender in the tee. Or like I said put a bung in the tranny pan for it.
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flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 03-08-2008, 06:59 PM   #5
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99 sahara
4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 03-08-2008, 07:18 PM   #6
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ok. then i have to install it in the hose from the tranny to the stock ATF cooler.
i donīt want to install the sensor in the tranny pan. iīm too lazy to uninstall my warn oil pan skid for that. btzw. what temp rage should a ATF temp gauge have?
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Old 03-08-2008, 07:29 PM   #7
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Yes the line from the tranny to the rad. They make gauges in all different ranges I like the ones that go from 100F to 250F. Thats a good range.
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99 sahara
4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 03-08-2008, 07:32 PM   #8
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100F to 250F = 40C to 120C
i want a gauge with a european scale.

is that enough for ATF? what temperature is normal for ATF and from where on is it too hot?
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Old 03-08-2008, 09:51 PM   #9
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During normal driving it will be under 200F Like 180F.
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99 sahara
4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 03-09-2008, 01:08 PM   #10
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i would recomend not putting it inline with radiator cooler. because... the stock temp of your radiator is 190f to 210f which is above the optimal temp of a stock auto trans. 160 to 180f is about the range you want.

i would run it stand alone if possible. I ran one for a while and i never had over heating issues again. the problem with putting a sender in a T fitting is it will not be grounded. the sending unit needs to be grounded to work properly.
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Old 03-09-2008, 01:20 PM   #11
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Just run a ground wire.
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99 sahara
4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 03-09-2008, 01:31 PM   #12
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Quote:
Originally Posted by 4.0l sahara View Post
Just run a ground wire.
does it help to run a wire from the t-fiting to ground?
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Old 03-09-2008, 02:32 PM   #13
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yes run a ground from the t fitting to the frame,block,battery or any good ground.
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99 sahara
4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 03-09-2008, 07:04 PM   #14
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Quote:
Originally Posted by Rawkon View Post
i would recomend not putting it inline with radiator cooler. because... the stock temp of your radiator is 190f to 210f which is above the optimal temp of a stock auto trans. 160 to 180f is about the range you want.

i would run it stand alone if possible.
is the cooler that i bought big enough to cool down the tranny oil alone?
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Old 03-09-2008, 07:49 PM   #15
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Yes should be okay but you could of done better with a cooler like this.
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99 sahara
4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 03-09-2008, 07:55 PM   #16
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Yours should be fine but if you want the best this is it.
http://store.summitracing.com/partde...5&autoview=sku
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99 sahara
4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 03-09-2008, 08:58 PM   #17
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Quote:
Originally Posted by Rawkon View Post
i would recomend not putting it inline with radiator cooler. because... the stock temp of your radiator is 190f to 210f which is above the optimal temp of a stock auto trans. 160 to 180f is about the range you want.
The factory auto tranny cooler is physically located inside the radiator assembly. The auto tranny's coolant in/out lines connect to the two tranny ports located at the bottom of the radiator.

I have two tranny temp senders that I have connected to the tranny temp gauge via a SPDT switch. One is in the ATF pan and the other is in connected in series with the output of the tranny cooler and it seldom gets over 180 even when the engine is 210. It typically runs 150 or so on the output side of the tranny cooler, 180 in heavy traffic. The ATF is fine even when the temp peaks into the low to mid 200's. It averaged 125-150 degrees while offroading this past weekend with a few peak temps of 180 degrees. On the street, it doesn't usually even see 180 except on a warm day in traffic. I expect it'll get a little hotter somewhere like Johnson Valley but I just got the auto tranny conversion done a few weeks ago and it only has one break-in offroad trip under its belt so with tougher trail conditions, it'll likely get a little warmer.
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Old 11-19-2008, 12:03 PM   #18
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Is an additional tranny cooler needed?
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Old 11-19-2008, 12:12 PM   #19
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Is an additional tranny cooler needed?
The only way to know for sure is if you install a tranny temp gauge. Since installing mine earlier this year, I have determined mine runs hot enough (it peaks at 240 degrees) at times to need an aux cooler.

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