3.55 489 center WIW question
A 3.55 open would have come in a truck or van, the car units for 3.55 and lower gears were all part of an axle package that included a Sure-Grip.
Around here, yours would go for 125 to 150 if the pattern and teeth all look good, spins freely, etc.
For 3.55 complete units in good condition with Sure-Grip, I have bought them from 250 to 350 with the clutch type centers.