1978 GMC 3500 with a 6BT Inline-Six

1978 GMC 3500 crew cab with a Cummins 6BT inline-six

This 1978 GMC 3500 Sierra Grande is powered by a turbocharged 5.9 L Cummins 6BT diesel inline-six. A 47RE four-speed automatic transmission sends power to the rear wheels. The truck also features power steering, front disc brakes, and rides on a set of Alcoa 22-inch wheels with 265/40 tires. The crew cab holds a custom interior with Vintage AC and Dakota Digital gauges.

1978 GMC 3500 crew cab with a Cummins 6BT inline-six

1978 GMC 3500 crew cab with a Cummins 6BT inline-six

1978 GMC 3500 crew cab with a Cummins 6BT inline-six

1978 GMC 3500 crew cab with a Cummins 6BT inline-six

1978 GMC 3500 crew cab with a Cummins 6BT inline-six

1978 GMC 3500 crew cab with a Cummins 6BT inline-six

1978 GMC 3500 crew cab with a Cummins 6BT inline-six

1978 GMC 3500 crew cab with a Cummins 6BT inline-six

1978 GMC 3500 crew cab with a Cummins 6BT inline-six

1978 GMC 3500 crew cab with a Cummins 6BT inline-six

Source: Classic Cars via GM Authority

2 thoughts on “1978 GMC 3500 with a 6BT Inline-Six”

  1. I have mixed feelings on this one. Super cool conversion and I love the interior, but for a 1-ton diesel, the bed is disappointingly unusable.

    1. I suspect that half of the drivers with pickups seldom use the beds for much other than the very odd light load. I think his biggest issue is finding a place to park it.

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