If you own a NPR, NQR or GM W3500, W4500 or W5500, a problem that you may experience is a popping or grinding in the rear axle which usually indicates a differential gear breakage that can be easily changed in about two hours.

Differential Gears, also called “Center Chunks,” “Pumpkins,” or “Hogheads” can come in a variety of gear ratios ranging from 3.54 to 6.1.

If you call with the VIN number, then we can help determine the proper gear ratio that you have in your truck.  803.564.3228 or go to our home page, type “differential” in the search box on the upper right of the page to see what we currently have offered online.  We generally keep a lot in stock at all times.  Call for pricing and shipping information.

Click on the links below to see our helpful videos.

How to find the VIN on your Isuzu NPR, NQR, and GMC W-Series.

How to find your Rear Axle Ratio and Differential Ratio on a Mitsubishi Fuso.

How to find your model, paint code and rear end ratio on the Isuzu NPR, NQR and GMC W-Series.

How to find the engine model number on Isuzu NPR, NQR and GMC W-Series.