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I agree with Durango on the strength issue, thinking they might have had a larger input shaft on the diesel tranny, not sure. You'll need a Dodge/Cummins adapter plate from an automatic equipped truck, and I suggest a Dodge Cummins torque converter, or even a beefier aftermarket piece. Diesel's make their power in a different rpm range, so a gasser converter may not come on soon enough. You want a lower stall speed to match the off-idle torque curve. Also get the biggest tranny cooler on the planet.

That should be one killer swap! My Dodge weighs about 5200-5,500 lbs, so very similar, and I couldn't be happier with the Cummins 4BT installation, even bone stock! You can tweak it up, but for a daily driver you might not ever need to.
 
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