If the pinion is angled up at the same angle as the rear of the transmission, then they will be parallel (and on the same plane.) Both the engine and pinion shaft also need to be parallel to the centerline of the truck (and thus parallel to each other.) The driveshaft would need to have the same angle on both ends and should work OK as long as the total angle (considering both horizontal and vertical angles). Here's a pic stolen from DrivelinesNW. The driveshaft would look like the picture both from the top and the side.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.