I have no experience with a turf saver differential, but I have some experience rebuilding a motor. Maybe to test their theory on the differential you could disconnect the driveshaft to the rear to eliminate the differential, put on jackstands (guess with the driveshaft off you don't even need to worry about this as long as you are out of 4wd), and drive it that way. If the engine and transmission are fine it will still spin the rear output shaft of the motor (just tape up your yoke if you have a u-joint so it doesn't bang around). And if you do have a problem in the motor you should still notice an issue. Just a thought.
-2011 Polaris RZR-4 800 (SOLD)
-1999 Polaris Sportsman 500 ATV
-2006 AC Prowler 650XT (SOLD)-- updated bevel gears, updated oil pump driven gear, 4 wheel disc brakes, line lock E-brake, Papa Slap clutch, Xentec HID's, Dynatek CDI, Warn skid plates, Intellitronix gauges, 2010 intake/cvt duct work and dust shield, RZR seats, Bestop folding windshield, full cab kit, rear cage and rear seats (4 seater)
Last edited by out west; 09-13-2012 at 11:15 AM.