Here's why it is unneccessary to deal with pinion angle to the degree needed for 2 joint driveshaft when changing to slip-yoke driveshaft.
What all stock trucks come with for 2 joint driveshaft where the slip yoke is in the tcase:
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Look at the blocks on the perch. The smaller one on top is a degree shim. The shim pitches the pinion back down. The angle b/t the driveshaft and pinion must be within 2-3° of the angle between the tcase and driveshaft. Effectively parallel.
Going to a slip yoke driveshaft (only 1 CV at tcase), which also means a slip yoke eliminator on the tcase results in:
The pinion is pointed directly at the tcase output. That's roughly 30° or so.
Yeah, don't install an axle with the pinion pointed backwards...emmm k?
Also forgot to mention that if you really wanted to stay 5 lug, you can do it w/o going adapters. I wouldn't go that route myself. But here's a thread on one way to go 5 lug although it may be outdated and off the shelf products are more readily available.
Here's one disk brake conversion kit.
Get on it Danz51!!!