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rpm on 4.8 gmc

Discussion in 'Chevy Trucks' started by mushplows87, Sep 11, 2010.

  1. mushplows87

    mushplows87 Junior Member
    Messages: 11

    gmc 4.8 shifts out of passing gear just over 5000 rpm, tach has no red line, is this in the safe rpm area? also has the typical chevy clunk in the drive line, yoke? maybe, thanks for any imput
  2. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    If it's not hitting the rev limiter (which I know it isn't because they're set to 5900 RPM) it's fine. The 4.8's do like to and need to rev, 5K is nothing. Guys turn them 6500 RPM all day long with nothing but a camshaft change and a custom tune and never hurt them. You're likely just used to the older engines.

    Your clunking may be a worn yoke or a U-joint so check it all over for any excessive play. Check for any broken leaves in the rear spring packs too if it's had many decent loads in the bed.