1997 Chrysler Concorde

Transmission problem
1997 Chrysler Concorde 6 cyl Automatic

I just had my engine replaced. The new engine has 52,000 miles on it. The old engine had 120,000 miles. The mechanic cleared out the computers' memories but the check engine light still came on. He said it was the speed sensor. He replaced those and the engine light still came on. When I drove it, it shifted smoothly from 1st to 2nd, and 2nd to 3rd. But it will not shift up from 3rd. It shifts back down perfectly fine. What could be the problem?
June 25, 2010.

Most Chrysler product have two speed sensors input and output
need to have the codes
if check engine light coming on you have a trouble codes stored in the computer and should scan and get them

try and get the codes also don't over look the wiring
sensor maybe good but if the wire that connect it to the PCM failed still going to read no signal
let us know what you have for codes

Jun 26, 2010.