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Trany has 356k on it. 1993 C2500 6.5 TD.
Had it rebuilt @353K after losing reverse and was taking off in 2nd. Took it back twice due to losing reverse again and once because of hard shift. Line came off spilling 75% fluid and ceased movement. Took to different shop, fresh rebuild, 100 miles+- now shifts to OD @ 56mph but goes to passing gear very often without appling additional pressure to accelerator. Also downshifts same when towing EMPTY 16ft. trailer. Shop drove 104 miles says can't duplicate. They gave 24000-2year warranty. No codes shown. appreciate assistance. San Antonio,Tex.