i have a 9 bolt rear that is from an 88 iroc convertible. the car had a 5.0 TPI motor and 5 speed trans. i still have some parts of this car left. the rear is complete from rotor/caliper to rotor/caliper. the odometer shows 120,xxx miles. i don't know if its the 3:27 or the 3:45 gears-due to the car being a 5 speed it is probably 3:45. to save some time NO, i won't go pull the cover to check on exactly which gears are in it-if you want to do that bring a gasket and have at it. i'm located in bakersfield and the rear is for pick up only. price is 350.00 for everything email me at ron09517@aol.com