I have a 51 Willy's pickup with a 4.3 Chevy motor, SM-465 trans and unfortunately, a NP-208 t-case presently. Wanting to change out Timken rear W/5.38s and Dana 25 front. Where I reside not much junkyard stuff to choose from. In your opinion, what would be the most reliable, reasonably strong, and ease of install that I should chase. Vehicle will be used predominately on back roads America. Some steep Jeep trails,and 10-20% freeway time. Hate this computer crap. If this goes through, Thank you very much!