I currently have the 525 tranny in my 85 Shelby charger and am lookin at getting my 89 555 rebuilt and throwin in the car. My question is what axle combo can I use that would be an upgrade and eliminate the u-joint and extension shaft that is in the car already? also I would prefer that those same replacement axles bolt rite up to the 555 tranny. I don't know if the spline counts on the tranny ends would be the same or not.