decide to take a pic of what the transaxle code looks like for 02-03 maxima 6 speeds with HLSD. This is the best/most accurate way to tell if your car is equiped with it......http://www.cardomain.com/ride/691702/4
you can see the RS5F50H meaning hlsd
hope its clear enough pics

 

It says RS6F51H.... I believe the 6F is for 6 forward gears and the H is for Helical.

 

^ You are correct. If its an open diff, the code ends in 'A'.

 

This feature should be standard on all 6 speeds. I can't understand why nissan made this an option......Just like traction control should be standard on all auto. With all that tq going thru the front wheels its a must

 

Is this code found on the vin plate under the hood?

 

Yup...it sure is!