1989 Ford LTD

Transmission problem
1989 Ford LTD V8 Two Wheel Drive Automatic 142000 miles

I recently rebuilt the engine in a 1989 ford crown victoria LTD. The owner maintains that the the overdrive was in perfect opperation before I pulled the engine. I replaced the engine and now the overdrive in the transmission wont engage, its like it gets to a certain RPM and then it just freewheels. All other shifting points in the transmission are normal, including reverse. The engine is a 5.0 F.I. The tranny has 1st, D, and OD. Is there anything that I could have done that caused this problem?
October 6, 2010.

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