will not shift into first on its own

I took my motor and transmission out of my truck and put into my other truck. Both are same year models. Everything is working fine except when I put my truck into drive it will not shift into first gear on its own. I can drop it into first gear and it will go then i put it back in drive. Its all shifts fine until I stop and have to take off again. What do you think this could be.

Thanks Hunter

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Deck the Halls
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@muddog ,Hunter, Always check the fluid level as a first step and top up if needed. If the transmission will not downshift, one of the shift solenoids may have become stuck open / closed, preventing fluid from entering the transmission valve body to pressurize the correct gear, faulty PCM, check for faulty wiring loose/pinched/damaged, sensors such as VSS/TPS faulty,etc.etc.. May be should have scanned for error codes as this could lead directly to the fault. Some of the auto parts suppliers offer free code reading like Pepboys, Nappa, Advanced auto parts,etc and some of the guys are very knowledgeable and may have seen the issue often and put you on the right track. May have to visit a good local tranny shop and have them take a look,diagnose and estimate repair. A couple informative links below. Good luck. I hope this helped you out, if so let me know by pressing the helpful button.

https://www.transmissionrepaircostguide....

http://www.twincharlotte.com/transmissio...

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