[Kenth]

1969 GRAND PRIX TYPES OF AXLES:

1. Type axle: Regular Duty. Type Diff: Standard. Diff Carrier: Gray Iron. Axle Shafts: Cold extruded. Diff Asm. 2 Pinion Non-lock.

2. Type axle: Medium Duty. Type Diff: Standard. Diff Carrier: Gray Iron. Axle Shafts: Cold extruded. Diff Asm. 4 Pinion Non-lock.

3. Type axle: Medium Duty. Type Diff: Safe-T-Track. Diff Carrier: Gray Iron. Axle Shafts: Cold extruded. Diff Asm. 4 Pinion Lock.

4. Type axle: Heavy Duty. Type Diff: Safe-T-Track. Diff Carrier: Nodular Iron. Axle Shafts: Hot Forged. Diff Asm. 4-Pinion Lock.

The Grand Prix has two types of Safe-T-Track differentials - medium duty and heavy duty - -the usage dependning upon the engine - transmission combination and the axle ratio. The medium duty Safe-T-Track differential has four pinion gears and a gray iron carrier. Cold extruded axle shafts are used with the medium duty Safe-T-Track.
The heavy duty Safe-T-Track also has four pinion gears but the carrier is nodular iron. The heavy duty axle shafts are hot forged.

Important: Due to the material or manufacturing differences in the medium duty and heavy duty axle parts, they should NEVER be interchanged.