New 12V OSGR Starter Motor Compatible with 2011-2016 GMC W4500 W5500 W3500 Isuzu NQR NRR Reach 4JJ1 3.0L Diesel Cabover Replaces 4280006952 428080-6951 8981225031 428000-6950 4280006950

GMC W-SERIES — Isuzu 4JJ1 3.0L Diesel:
• W3500 / W4500 / W5500 Cabover (2011-2016)

ISUZU N-SERIES — 4JJ1 3.0L Diesel:
• NQR / NRR / Reach Walk-In Van (2011-2016)

4JJ1 ENGINE:
• 3.0L (2999cc/183ci) Inline-4 DOHC 16V Turbodiesel
• 95.4mm x 104.9mm / 17.5:1 / CRDI / VGT
• Cast Iron Block / Aluminum Head

OEM PART NUMBERS:
• Denso: 428000-6950 / 4280006950 / 428000-6951 / 4280006951
• Denso: 428000-6952 / 4280006952 / 428000-6953 / 4280006953
• Denso: 428080-6950 / 428080-6951 / 428080-6952 / 428080-6953
• Isuzu: 8-98122503-0 / 8981225030 / 8-98122503-1 / 8981225031
• Isuzu: 8-98122503-2 / 8981225032 / 8-98122503-3 / 8981225033

SPECIFICATIONS:
• Type: OSGR / 12V / 2.5kW / CW / 10 Teeth
• Gear OD: 37.5mm / Mount: 15.3mm Unthreaded / 12 lbs

12V 2.5kW OSGR Starter — GMC W3500 W4500 W5500 Isuzu NQR NRR 4JJ1 3.0L Diesel:
Direct-fit 12-volt 2.5kW Denso OSGR starter for GMC W-Series and Isuzu N-Series medium-duty cabover trucks powered by the Isuzu 4JJ1 3.0-liter inline-4 DOHC 16-valve turbocharged diesel engine (2011-2016). Covers GMC W3500, W4500, and W5500 plus Isuzu NQR, NRR, and Reach walk-in van — all badge-engineered twins sharing the same Isuzu powertrain. The 4JJ1 features 2999cc displacement with 95.4mm bore, 104.9mm stroke, 17.5:1 compression, common rail direct injection, and variable geometry turbocharger. 10-tooth CW pinion with 37.5mm gear OD. 15.3mm unthreaded mounting ears. These commercial cabover trucks serve urban delivery, box truck, flatbed, utility, and municipal fleet applications across North America. Lightweight at just 12 lbs for easy installation and service.
⚠️ IMPORTANT: Verify OEM part number before ordering to ensure proper fitment.