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2000 Chevy Silverado one ton truck. This truck has an automatic transmission 4L-80 E My son was using it to back and forth to school then one day no reverse

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    Welcome to Motor Vehicle Maintenance & Repair! How many miles on the truck? – Pᴀᴜʟsᴛᴇʀ2 Feb 6 '18 at 19:00
  • Linkage out of adjustment? Checked the fluid level? – Solar Mike Feb 6 '18 at 19:20
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Maybe a bad vehicle speed sensor on the transmission. If the control module senses a speed reference greater than 8 mph during the shift into reverse, it has the ability to prevent the shift from happening. Try disconnecting and see if you have reverse.

Otherwise probably will require a pressure test by a transmission shop to diagnose.

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