[hatzie]

Input shaft center support needle bearing or the cluster gear needles make noise in the Saginaws.
GM only used two rows of needles inside the cluster gear in the Saginaw 3 & 4 speeds vs four rows in most other transmissions so the countershaft and cluster gear sometimes wear badly.
Not difficult to repair as long as the cluster gear isn't knackered.

If you like that transmission fix it before it strips the teeth off the input shaft or the cluster gear or both.

The GM NP440/A833 MY6 is a more robust light duty transmission than the Saginaw. The only real gotcha is the countershaft bearing wearing the aluminum case hole oval. It can be repaired. Chrysler used the AL case A833 in racing applications with steel bushings in the countershaft bores that were tight press-fit to the case and loose press fit to the countershaft.
Not just any Joe with a Bridgeport is going to be able to pull this off. I am not capable of setting up this level of precision boring. I can make bushings within 0.0005" on my small lathe but aligning a worn case on my Gorton 9J table or dogged to the carriage on my big lathe so the shaft holes can be bored in-line and concentric with probably only four to six points of reference (two to three per hole) left of the original bores is not a task I'm willing to undertake.
https://www.hotrod.com/articles/mopp...-case-buildup/