right rear of case Series Designation and Plant mission 1962 ALUMINUM POWERGLIDE Stamped on ma 15 21 2400 L A Saginaw 3 Speed chined surface on lower right of case 15 21 2400 ... Muncie 3 Speed 1963 65 POWERGLIDE Stamped on bottom of oil 15 21 2400 L C Toledo 3 Speed pan 15 21 2400 L G Saginaw 3 Speed 1963 MUNCIE 4 SPD Stamped on cover ... side of Hvy Duty case with P designation 15 21 2400 L H Muncie 3 Speed 65 PASSENGER exc CORVAIR 4 SPD On the Hvy Duty top right flat of the Case Assy