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In 2006, the Chevy Impala uses an axle nut with an M27-2.0 Thread Spindle designation and a 34mm hex size as specified by the manufacturer. The price of an axle nut can vary depending on the quality of the metal used, usually ranging from $10 to $20 for a full set. If you're uncertain about the size, you can measure it by placing a measuring tape on one of the flat sides of the nut's outer perimeter, then stretching the tape across to the opposite flat side. Count the number of lines on the tape measure for the metric measurement.
I found that the 33 mm size was a better fit for me.
The 2004 Chevy Impala's axle nut on the thread is M27-2.0, with a hex size measuring 34mm.