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I did not have to with the tranny cooler, but I wanted more efficient cooling. One thing that happens with a V shaped motor in an XJ is there is little or no air flow through there. Got it real hot...

Right now they pull, but I am going to change that to push in. More efficient cooling that way on the trail

These are home made, but they need to be pointed like this. As the air flows across the louvres, it creates additional vacuum to draw more air out of the radiator and engine area.
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Not as cheap, but the results are better. Check into Gen Rite. They have some nice vents

Because when the air breaks over the front of the vehicle, it creates an area of vacuum there and with a vent there, it will help draw air through the radiator. At the rear of the hood is actually...

Yes, we have heard of them. We have a thread here somewhere in the Tech section on it. However, we need to make a disclaimer concerning spacing the rear of the hood. If this is just for trail use,...