I removed a 4 speed Spicer auxiliary from a 1965 80 series.
I’m about 99% sure it was factory and if it wasn’t then it was a very well designed install kit that looked as if factory.
https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=909513

Pictures in the later half of this album. https://goo.gl/photos/7X9t8keUfeooJbvx5

Last edited by Grigg; 10/05/2019 12:36 AM. Reason: more info
•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-