9 With the transmission in proper position, we can see the rear of the tranny is down to clear the top of the tunnel. In most installs, the driveshaft angle needs to be modified to allow the correct three-degree driveshaft angle. We go back to the differential and install a 31/416-11/44-inch-thick washer between the differential front mount cushion and the front differential mount bracket to lower the front of the differential. Routing the O/D speedo cable in the original position can cause cable bind, so we ran the speedo cable through the firewall where an automatic transmission cable would be. We then followed an automatic transmissions speedo cable routing.