1993 Lebaron won't upshift to 3rd gear

We have 107k on the 1993 LeBaron GTC convertible. It was hit in the passenger headlight area recently and we pounded, stretched and pulled to straighten it out, replaced the sheet metal, etc. We had to disconnect the computer module located on passenger side of engine compartment (near the front on the side wall) during the repair job. Now that the car is back together, it won't upshift to the top gear. Is the shifting controlled by that computer module? If so, could the impact have damaged it so that it the car won't shift properly now? Or is there some shift linkage that might have become bent?
Thanks.