I am getting ready to change the axle ratio in my 57.  I'm thinking Richmond Gear.  They advertise three installation kits with bearings.  They have different kits for different case sizes, 2.891, 3.062 and 3.250.  Is there a standard size that came in 57's? or is there a production variance?  Where do you measure the case to get the dimension?  I have two rear ends, and an extra 9" housing.  The gear in the car now howls terribly accellerating or decellerating and if I thought bearings would solve the problem, I would just change them...but the ring and pinion may be bad too, they look fine.  I also have the 3.10 rear end that came in the car, and I am going to convert it.  Since it is a fair amount of work to do this, I want to replace the bearings too.  Any thoughts and info appreciated.  I'm going to have a pro do the work.  I have experienced that even rear ends set up by a pro whine slowing down where as factory rear ends never seem to do that. 

Paul J. - '57 E Code