<P> For 2001, the 6.0 L V8 in 2500 - series Suburbans gained 20 hp (15 kW) from a number of changes including aluminum cylinder heads . The new Vortec 8100 8.1 L (496 cu in) V8 was added as an option for the 2500 as well . OnStar became standard on LT models and LS models with the new Z71 package . Quadrasteer four - wheel steering was added as an option on 1500 series trucks . </P> <P> 2002 saw several optional features made standard equipment on the LS model, including front and rear air conditioning, alloy wheels, power windows, power front seats, side steps, fog lamps, and heated outside rear view mirrors . Base models were discontinued, leaving LS and LT . </P> <P> The Vortec 5300 L59 variant in the 1500 series added flex - fuel capability . The 6.0 engine was not available in the 1500 series . </P> <P> For 2003, all GM full - size trucks received an upgraded interior, with better - quality materials and other enhancements . New radios offered Radio Data System compatibility, XM satellite radio, Bose sound and improved ergonomics . Adjustable pedals were added as an option, and the instrument cluster - mounted Driver Information Center was improved and monitored up to 34 vehicle functions . A Panasonic DVD system was added as an option . GM's Stabilitrak system was added, and Quadrasteer became available on 2500 series Suburbans . Towing capacity for Quadrasteer - equipped vehicles was reduced by 300 lbs (the weight of the system). </P>

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