I have a 2002 lwb 2500 that has had someone else paws on it before I bought it an I can’t figure out what’s going on the trans was rebuilt an had the upgrade where you have the button on the shifter to choose you gear. However I just got done with a complete motor job an the trans will bang into reverse goes into drive smooth sometimes it will flash the little block around the D an not move till put into reverse. But when it does it will shift all gears but harsh into 4-5 an the 2-1 harsh no codes.
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