I purchased 2 hayden coolers one for the tranny and the other one for the motor. I wanted to know from those that are running tranny coolers did you replace it or add to the stock cooler? Not sure on how I want to set it up.

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Outlaw KJ '04 4X4 v6 Sport
Frankenlifted front, custom springs 4" rear, 23.25" F/R - 265/75 Duratracs 16x7 D windows- JBA 4.5 UCAs, Y-link - AEM Brute Intake - Rockcrusher diff cover, Mopar Front Skid, All J belly skid, Skink Sliders - EBC Green Stuff F/R - DTT Front, 4.10s

Your KJ only has a stand alone trans cooler.The best way for the trans is to install a radiator for a '02 KJ with the built in trans cooler then route the trans fluid through it 1st then to the stock stand alone cooler,then back to the trans.Just stacking stand alone trans coolers can be bad since it will run to cold and then when really pushed hard still will not handle the temp spikes like a in-radiator trans cooler by itself.

Thanks TJKJ. Got a few days off to PMCS the KJ and install parts that are collecting dust in the garage. Hopefully get to tackle the oil coolers while I'm at it.

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Outlaw KJ '04 4X4 v6 Sport
Frankenlifted front, custom springs 4" rear, 23.25" F/R - 265/75 Duratracs 16x7 D windows- JBA 4.5 UCAs, Y-link - AEM Brute Intake - Rockcrusher diff cover, Mopar Front Skid, All J belly skid, Skink Sliders - EBC Green Stuff F/R - DTT Front, 4.10s

I installed the 02 radiator in my old kj for the transmission cooler. The transmission light never came on again. Even while climbing over13,000 feet in four low.

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2003 KJ Renegade, 5 speed, frankenlifted,Al's a Arms 4.5,Moabs 245/75/16 BFG KM2's, custom rock rails, full Mopar skids, Hella ff220 lights,Hd cooling,Front DTT,Riddler diff cover,Rola safari rack,Cobra 29 peaked & tuned.

Pastafari Alum, Pink shovel recipient