i have a 99 grand prix gt with 158k on it i just picked up for free.
i am very nechanical and could swap one if need be, but just wondering if this is a known problem.
the car will take off in 2nd and shift to 3rd but will not shift into OD or shify back down into 1st, any tips on what to look for or do?

also for worse case scenario, being a 99 gt, what other year/model trans will bolt in, fit and work with the ECU?

thanks in advance