Identify your GMC or Chevrolet rear end gear ratio by the RPO Codes, usually located on the placard labeled “Service Parts Identification” inside the drivers door panel or glove box. Note that using the RPO code for parts identification assumes that the rear end has not been previously ...
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Introduced in January of 2004, the RPO code LLY Duramax 6600 incorporates a number of significant technology changes. Two forces control diesel engine evolution for all engine manufacturers -Emissions compliance and market share. The technology changes introduced with the LLY address both of these forc...
Toggle BB code Post Reply Related Threads C Transmission - Rearend Crow44 May 31, 2009 Trans choices...72 Monte Carlo I'm putting a GM crate ZZ383 in my '72 Monte (about 3500 lbs) It is advertised as putting out 400-450 lb/ft from 2000 rpm upto 5500. 15" rims, cam ...