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  1. Hi just joined have a 1988 f350 idi diesel 4x4 crewcab best damn truck I ever owned all of a sudden she started to not shift into drive until about 55 mph 2600 rs and when I back off gas she downshifts to 2nd at 45 mph again around 2600 rs. Also my brakes pedal lock down on second pump and it takes both feet to stop. Haha is this a brake booster issue?
 
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