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I had 2 7.3s the last was a 2002 til 2019. CC with 3:73 gears. Fords trannys back than, that at the time I cannot remember the model were junk. I went through #1 at 40,000 , got a new ford tranny replaced by ford and it lasted til about 80,000. I then spend the money to buy aftermarket the best 5400 I ever spend. I knew several co-workers who towed with those and more people I met all had problems until they went aftermarket. After it never let me down or had problems you describe. Before I always towed without OD on, after it was fine with OD on or off. The tranny coolers are way too small. I think your talking tor. converter in tranny wore out. I am no tranny expert. Mine blew clutch plates apart, next 1 overheated when used towing in hot temps. Talk to a tranny shop. Good ones all about that tranny.
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2013 24RKSWE (27ft TT) Cougar 1/2 ton series SOLD 10-2021
2013 Ford F350 4x4 CC 6.7 engine, 8 ft bed, 3.55 rear end, lariat package
Retired from Oregon State Police in 2011 than worked another 9.5 years as a small town traffic cop:
As of 05-2020, I am all done with 39 years total police work. No more uniforms for me.
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