Has there been a lot of problems with 2013 Nissan Altima transmission
Yep. Some. http://www.carcomplaints.com/Nissan/Altima/2013/transmission/
Yes. I have replaced several. They seem to have worked out the problems on the 2015 models but 2013 was a bad year for transmissions in Nissans. I replaced more that year than the rest of my 16 years at Nissan combined.
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