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Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by rg79, Mar 11, 2013.

  1. rg79

    rg79 New Member

    Here's one to chomp on. 2005 ccsb Z-71 5.3, 4l60E, G80....Wondering about the difficulty level and/or possibility of a bolting in a newer 6L60E in place of the 4L? Thinking it would have to have the '11+tune for shift points, but will that work with the engine? What kind of wiring issues, t-case issues?
  2. redvett

    redvett Member

    Its been done but its not easy. You would need wiring PCM for the 6L60E since the PCM is faster. I think the 6L80E is a more durable trans for the truck. GM has never used the 6L60E in a truck only the 6L80E or 6L90E.
  3. Conlan Rose

    Conlan Rose Active Member 2 Years 1000 Posts

    Also the tranny is longer so you will need a new drive shaft for the front and back.

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