1986 Mack DM 237 Truck 1986 Day Cab Diesel DM 237 Mack Add Comment 1986 Mack DM 237 Truck Here's American old classic truck that was made by Mack, as the pictures is a DM 237 model built in 1986 fairly cool as a day cab semi tractor truck. 1986 Mack DM 237 fuel: diesel transmission: manual