Since I read so much non-sense on the other thread about shifting, I'm posting a link I found to proper shifting. I also posted it over at the miata site I belong to since it had a lot of good information.
Please keep in mind that this write-up is by an owner of a Z3...that means it's a REAR wheel drive car. Sentras are FRONT wheel, as we all know, and so the sorts of balance upsets mentioned in the article are not achievable in the Sentra.
http://www.waycoolinc.com/z3/essenti...e/shifting.htm
Enjoy.