The reason a 1992 Nissan Maxima is downshifting so much is the transmission is slipping. This may be due to low Transmission Fluid levels, or old and worn out transmission fluid. The transmission itself may need to be rebuilt.
How much does it cost to replace a 2004 nissan maxima transmission and motor mounts
how much is it going to cost me to replace the back struts on my Nissan maxima
According to the official Nissan site http://www.nissanusa.com/maxima/, the MSRP for the 3.5 S is 30,690.
33,000
The 2005 Nissan Maxima's engine produces 255 ft-lbs. @ 4400 rpm.
The 2010 Nissan Maxima's engine produces 261 ft-lbs. @ 4400 rpm.
The 2013 Nissan Maxima's engine produces 261 ft-lbs. @ 4400 rpm.
The 2007 Nissan Maxima's engine produces 252 ft-lbs. @ 4400 rpm.
The 2014 Nissan Maxima's engine produces 261 ft-lbs. @ 4400 rpm.
The 2009 Nissan Maxima's engine produces 261 ft-lbs. @ 4400 rpm.
The 2004 Nissan Maxima's engine produces 255 ft-lbs. @ 4400 rpm.
The 2006 Nissan Maxima's engine produces 255 ft-lbs. @ 4400 rpm.