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Message: <blockquote data-quote="AuroraGirl" data-source="post: 28393" data-attributes="member: 9417"><p>found this on the service data 2003:</p><p></p><p></p><p><a href="https://gm.saturn.team/Chevrolet/Tahoe___4WD/2003/17/1/2227/44122#ss7-823848" target="_blank">[H3]A Component Comparison from the Previous Year[/H3]</a></p><p></p><table style='width: 100%'><tr><td>    •</td><td>Exhaust gas recirculation (EGR) system has been deleted on all applications.</td></tr></table> <table style='width: 100%'><tr><td>    •</td><td>A spacer plate between the crankshaft and flywheel is required for applications using the 4L80-E transmission.</td></tr></table> <table style='width: 100%'><tr><td><br /> b <br /> <br /> •</td><td>All 2003 applications use a piston with a graphite coated skirt. <br /> <br /> \<br /> <p style="text-align: left"></p> <table style='width: 100%'><tr><td>    •</td><td>The 6.0L LQ9 engine, VIN N, is available as an optional engine package.</td></tr></table><br /> </td></tr></table><p></p><p>THEN</p><p>in 2004:</p><p></p><table style='width: 100%'><tr><td><br /> Exhaust gas recirculation (EGR) system has been deleted on all applications.</td></tr></table><p></p><p></p><table style='width: 100%'><tr><td>    •</td><td>A spacer plate between the crankshaft and flywheel is required for applications using the 4L80-E transmission.</td></tr></table><p></p><p></p><table style='width: 100%'><tr><td>    •</td><td>All 2004 applications use a piston with a graphite coated skirt.</td></tr></table><p></p><p></p><table style='width: 100%'><tr><td>    •</td><td>The 6.0L RPO LQ9 engine, VIN N, is available as an optional engine package.</td></tr></table><p></p><p></p><table style='width: 100%'><tr><td>    •</td><td>RPO HP2 adds a stator, rotor, flexplate, thermal bypass fitting and thermal bypass hose.</td></tr></table><p></p><p></p><table style='width: 100%'><tr><td>    •</td><td>The positive crankcase ventilation valve is a non-serviceable fitting on the left rocker arm cover.</td></tr></table><p></p><p></p><table style='width: 100%'><tr><td>    •</td><td>The fuel rails for all engines, except the RPO L59, are returnless fuel systems. The fuel pressure regulator for those engines is now a part of the fuel pump module.</td></tr></table><p></p><p></p><table style='width: 100%'><tr><td>    •</td><td>First design applications use a piston pin that is floating fit to the piston and press fit to the connecting rod. Second design applications use a piston pin that is full-floating to both the piston and connecting rod.</td></tr></table><p></p><p></p><table style='width: 100%'><tr><td>    •</td><td>The first design piston, press-fit pin, and connecting rod are to be serviced as an assembly.</td></tr></table><p></p><p>2005:</p><p></p><p></p><p></p><table style='width: 100%'><tr><td>   •</td><td>All M11 cylinder head bolts are the same length.</td></tr></table><p></p><p></p><table style='width: 100%'><tr><td>    •</td><td>All applications use full-floating design piston pins.</td></tr></table><p></p><p></p><table style='width: 100%'><tr><td>    •</td><td>5.3 liter RPO L33 applications have an aluminum engine block.</td></tr></table><p></p><p></p><table style='width: 100%'><tr><td>    •</td><td>Some applications may use a second design camshaft retainer plate and bolts. Refer to <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2005/50/1/4210/43977" target="_blank">Camshaft Installation</a> .<br /> </td></tr></table><p></p><p></p><p></p><p>2007:</p><p><a href="https://gm.saturn.team/Chevrolet/Silverado_Classic___4WD/2007/87/1/6308/44122#ss6-1791147" target="_blank">[H3]A Component Comparison from the Previous Year[/H3]</a></p><p></p><p></p><table style='width: 100%'><tr><td>    •</td><td>The oil filter bypass valve is now internal to the oil filter.</td></tr></table><p></p><p></p><table style='width: 100%'><tr><td>    •</td><td>A new design inverted-lip crankshaft rear oil seal is now used.</td></tr></table><p></p><p></p><p>note: nothing for 2006 was listed different from 2005 , and this was 2002 and earlier I could find:</p><p></p><p>2002:</p><p></p><table style='width: 100%'><tr><td>    •</td><td>A new 5.3L engine has been developed and is identified as RPO L59 VIN Z.</td></tr></table><p></p><p></p><table style='width: 100%'><tr><td>    •</td><td>A new 6.0L engine has been developed and is identified as RPO LQ9 VIN N.</td></tr></table><p></p><p></p><table style='width: 100%'><tr><td>    •</td><td>All applications will use a two-point engine coolant air bleed pipe design.</td></tr></table><p></p><p></p><table style='width: 100%'><tr><td>    •</td><td>The Air Injection Reaction (AIR) system had been deleted from all applications.</td></tr></table><p></p><p></p><table style='width: 100%'><tr><td>    •</td><td>A second design valve stem oil seal and shim assembly will be used on all engines.</td></tr></table><p></p><p></p><table style='width: 100%'><tr><td>    •</td><td>Certain applications use a multi-layer steel design cylinder head gasket.</td></tr></table><p></p><p></p><table style='width: 100%'><tr><td>    •</td><td>6.0L LQ9 engines will use a full-floating piston and pin design. In those applications, the pin is retained in the piston by retaining clips.</td></tr></table><p></p><p></p><p>2001:</p><p></p><table style='width: 100%'><tr><td>    •</td><td>In manual transmission applications, a new design transmission pilot bearing is used.</td></tr></table><p></p><p></p><table style='width: 100%'><tr><td>    •</td><td>All cylinder heads are of a cast aluminum design.</td></tr></table><p></p><p></p><table style='width: 100%'><tr><td>    •</td><td>All crankshafts will have a short rear flange (at the crankshaft rear oil seal area). Certain applications (4.8L manual transmission and all 6.0L) require a spacer between the rear of the crankshaft and the flywheel for proper flywheel positioning. Longer bolts are required in applications using the spacer.</td></tr></table><p></p><p></p><table style='width: 100%'><tr><td>    •</td><td>The oil fill tube has increased in length.</td></tr></table><p></p><p></p><table style='width: 100%'><tr><td>    •</td><td>The current design four point engine coolant air bleed pipe will be used on early engines. A second design two point pipe (mounted to the front of each cylinder head), will be used on later engines.</td></tr></table><p></p><p></p><table style='width: 100%'><tr><td>    •</td><td>All 6.0L applications have a new design camshaft.</td></tr></table><p></p><p></p><table style='width: 100%'><tr><td>    •</td><td>Engine sight shield design has changed. The 4.8L and 5.3L applications will use a new one piece design. The 6.0L applications will use a new three piece shield.</td></tr></table><p></p><p></p><table style='width: 100%'><tr><td>    •</td><td>A second design valve stem oil seal and shim assembly may be used on later engines.</td></tr></table></blockquote><p></p>