all i know is if you tow in o/d your trannys done espacially in hilly terrain. It a ll depends on what your towing i towed 3 tons of power-line cable with my old 2001 e-350 sd over 1,000 miles with no problem but mine was the 7.3 diesel but for most loads the stock tranny cooler would be sufficent for loads under 4 tons i imagine e-150s have a lower GVWR compared to a 250 or 350
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1995 Bronco XLT 4x4 5.8L 225,000 mi orignial trans re-biult 5.8 V8
1996 2WD Ranger XLT 3.0L 170,000 mi
1995 F-250 XLT HD 4x4 5.8 V8 186,000 mi
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