i noticed the same problem in my 98 SE, but have noticed after a lot of elbow grease and replacing some parts, transmission computer, Vehicle Speed Sensor which was a pita i unplugged my Throttle position sensor yesturday just for sh*ts and giggles and drove it around the block drove like crap but after i plugged the wires back in i noticed a great deal of change my 1-2 gears did not shift near as hard, 3-4 smooth, I have also been told by a few nissan mechanic's on some other boards that when the tps goes bad it can cause admormal shifting, mine before yesturday drove at high rpms it seemed like the rpm gauge would match the mph gauge at location, but i do use lucas in everything, front differential, rear, transcase transmission, and it hasn't seemed to help if you do replace the tps the cheapest place i have found it has been auto zone for under 80 bucks, the vss sensor is suppose to be easy unless u break it off at the transfer case like i did then its a couple more hours worth of work just my 2 cents o
oh yea one more thing if u have the stock transmission cooler be careful thats what destroyed my first transmission, one of the lines got clogged and burnt it up, and i guess theres not temp gauge for the transmission or if there is mines not plugged in
heres the post from one of the mechanic's
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could it really be the tps?
Definitely, that was the first thing we used to check for shifting problems. (After all the obvious tests).
if u need any of the manuals i found an online version free, and legal, but you can only get one section a day unless u donate to the site its nissanhelp.com if its against rules to posts other sites i appoligse