1995 Ford Explorer transmission 4.0/It will not change out of 1st gear unless you get it going and leave off the gas and give it a little time to shift, but I think it is going into 3rd gear. Otherwise it works fine, but the OD off light is flashing and the code says rpm too high for 2nd gear. If I put it manually in 2nd gear while moving it acts like you are in neutral. Can you give me an idea where to go from here?

Clutch packs are likely shot. You may want to check out the outfit below, who are well-regarded:

http://www.jasperengines.com/transmissions.php

I have the same car and Nationwide Remanufactured Trasmissions www.nationwidereman.com helped me out for $999

If you need a rebuild, check out Fred Jones Enterprises, LLC, which is a Ford Authorized Distributor of Motorcraft and Ford Remanufactured powertrain assemblies:

http://www.fred-jones.com/catalog/connector/