You can try Intel-based Macs: Resetting the System Management Controller (SMC) and see if that fixes the problem. Unless you made an error in re-assembly the two should be unrelated. On the other hand it could be something in the design of the SSD. Personally, I would replace it with one from either OWC or OCZ.

To test if the two are in any way connected try replacing the old HDD to see if the fan slows down. If it does then reinstall the SSD, being very careful to do it correctly, and re-test. Check how you install the short ribbon cable connecting the disk to the motherboard. It's easy to get the pins on the ribbon cable mis-aligned.

If there isn't a temperature sensor on the replacement SSD, result

may be a cause of the symptom, of the cooling fan running fast...

Or, a wire that may connect an existing sensor could be damaged.

If the SMC does not resolve the problem, install a temperature/fan speed application.

Open Activity Monitor and set it to ALL PROCESSES and CPU to display values from high to low. 

When the MBP gets warmed up (or hot) post images of both for review.

Run an Apple Hardware Test:

https://support.apple.com/en-us/HT201257

Note that an error free AHT is not conclusive.

Ciao.

I had a thought that would be the problem. You will be happier with the Samsung. I've never had good luck with SanDisk flash drives. No reason to push one's luck with their SSDs.

Try not to get pulled over for speeding.

Was there a provision for a temperature sensor from the third-party SSD for the computer to

detect heat? If not, a default for most Mac computers, would be to have the fan run full speed.

Glad to hear you found another product better suited for use in the MacBook Pro.

An OWC macsales SSD would have been shipped with correct connectors to work.

{And if you happened to have certain models of iMac, they are very picky. OWC

sells a sensor kit for those.}

Good luck going forward!