PART NO. A-70232498. Gear, Reverse Idler. Replaces 70225425 Dim A (1)21 Teeth. MODELS: Allis-Chalmers TRACTOR: CA Allis-Chalmers TRACTOR: D10 (SN 3501 > ) Allis-Chalmers TRACTOR: D12 (SN 3001 > ) Allis-Chalmers TRACTOR: D14 (SN 19001 > ) Allis-Chalmers TRACTOR: D15 . Pk size: 1.