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Old June 18th, 2013, 11:34 AM   #1
Ebrown
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Default Trans cooler

I have a 1999 xj, with auto trans, np-242 , axle ratio 3.55 that I will be towing a Jayco pop-up (dry weight 2,100 and wet is about 2,900 lbs) I would like to put a trans cooler for extra protection, So I was thinking a cooler rated at 2,500 lbs, is this a good size ?? What trans line should I put the trans cooler on ie the transmission in or out line ? Top or bottom line on the radiator?

What is the maximum weight I can tow in over drive?
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Old June 18th, 2013, 12:16 PM   #2
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don't tow in overdrive
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Old June 18th, 2013, 01:03 PM   #3
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Get a bigger cooler. Bypass the radiator cooler, plumb the cooler instead. Don't tow in overdrive.
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Old June 18th, 2013, 06:09 PM   #4
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Quote:
Originally Posted by ajmorell View Post
Get a bigger cooler. Bypass the radiator cooler, plumb the cooler instead. Don't tow in overdrive.
why not run both coolers?

from trans go to radiator cooler, then to cooler back to trans.
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Old June 18th, 2013, 07:10 PM   #5
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Quote:
Originally Posted by skife View Post
why not run both coolers?

from trans go to radiator cooler, then to cooler back to trans.
it's not common but if the radiator cooler fails you'll have to deal with cross contamination which may end up costing you a new transmission

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Old June 18th, 2013, 08:17 PM   #6
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Quote:
Originally Posted by skife View Post
why not run both coolers?

from trans go to radiator cooler, then to cooler back to trans.
The tank on the radiator is mostly to help get the trans fluid to operating temp faster in cooler weather. Given most factory thermostats are between 180 - 210 for the cooling system, the temperature of the trans fluid after being run through the radiator will be in the range where transmission life begins to be affected. For heavy usage where trans temps regularly reach 200+ bypassing the radiator tank is preferred.
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Old June 19th, 2013, 12:16 PM   #7
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I just put in a new CSF HD 3 core radiator (2761 HD) ! The stock one was damaged at sometime in it life! The most weight I will ever pull is this pop-up at max.
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Old June 19th, 2013, 12:38 PM   #8
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look at "derale style" inline double pass coolers.
i just put one on my rock buggy. cheap, easy to mount, wont need direct airflow.
i think i payed 40 on escam.
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Old June 19th, 2013, 01:29 PM   #9
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Originally Posted by joe_jeep View Post
look at "derale style" inline double pass coolers.
I just put one on my rock buggy. Cheap, easy to mount, wont need direct airflow.
I think i payed 40 on escam.
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