Penntex PX-4G Alternator

These are remanufactured Penntex replacements for the PX-4G, PX-420G, or PX-422G, model alternators using mostly Penntex parts. These units have a core deposit (Core must be rebuildable) or can be purchased outright. If you choose the core deposit, we will include a return shipping label (Only in the Contiguous U.S.). Our units are designed and built to provide the highest possible amperage output at idle. Damaged Rotor, Stator or Housings will be given partial refund. 

These Penntex replacement model PX4G alternators are a great high output upgrade for your GM truck, van, or shuttle bus. Below are pictures of the Penntex replacements for Model PX4 versions. Feel free to call or email if you have any questions.

PX-4G w/External Fan

NOTE: All Penntex alternators are externally regulated. The regulator is usually located inside the passenger compartment of the vehicle. If you are unsure which component is bad, please use our testing checksheet to determine whether the alternator or regulator is bad. CLICK HERE to get printable test procedures.

Our high output alternators are a direct replacement for Lestex and Hehr Powerline alternators and will fit the following applications:

• 5.3L  2002 - 2009 Escalade, GM Trucks, Suburbans
• 5.7L  1996 - 2002 Express & Savanna Vans
• 6.0L  2003 - 2009 Escalade, Humvee, Suburban, Vans, Tahoe, Yukon
• 6.5L  1996 - 2002 G, Express, and Savanna Vans
• 6.6L  2006 - 2009 Shuttle busses
• 7.4L  1996 - 2000 G, Express, and Savanna Vans
• 8.1L  2003 - 2008 Suburban, Tahoe, Escalade, Shuttle Bus

(The style of the rear case may differ slightly from your unit)