[1project2many]

It may be tough to explain why you're in trouble without pictures.

The front driveshaft angle at the trans can be thought of as two angles. The angle between the chassis centerline and crankshaft centerline, plus the angle between chassis centerline and driveshaft.

Because the rear pinion is parallel to the chassis centerline the angle at the rear u-joint is only one angle, which is the angle between the driveshaft and the rear axle.

In order to make the two angle front joint cancel with the single angle rear joint, you need to move the entire engine and trans assembly so the driveshaft is at a greater angle with the rear pinion.

The picture shows what you would have to do in order to keep the engine and trans angled and still have a cancelling angle at the rear.

The better answer is to do what everyone is telling you: Match the engine and trans centerline to the chassis centerline. This turns the front joint angle into a single angle, the rear joint angle stays a single angle, and they cancel automagically.

And yes, what is shown in the video above is exactly what will happen if you do not make the side-to-side angles cancel.