The Muncie is an adequate 4-speed.
It is certainly the GM/Chev Achilles heel. They were weak. The case itself has been redesigned at least twice that I know of. The last version... the "super case" is supposed to finally be OK. I don't know much about it 'cause I don't care anymore.
I hope they finally VENTED the damn thing. The first thing any serious GM 4-speed guy had to do was drill 2 holes in the mainshaft bearing support down half the thickness of the plates height. Then another was drilled horizontally across them. Without this the pressure can get so high in the case it forces lube out the front bearing retainer.
The shifter arm bosses on the side cover were also a *****. The bosses need to be filed down or the shifter arms will rub and even bind.
The ridiculous "EARS" on the case to mount to the bell are horrible. I used to get Muncies for nearly nothing because the ears were snapped off by drawing the 4-speed to the bell with long bolts or threaded rod.
The oiling in the gears is fair and the oiling slots should be opened up with a die grinder.
I previously mentioned the poor...Mainshaft bearing support that is not part of the tailhousing.
The unbushed front case is just plain stupid. Stress on the cluster can start to work the counter gear shaft around until it is...out of round. This is when the cluster "corn cobs". Hahaha...I love that term.
The input shaft is too shallow in the cluster gear as well. GM 4-speed guys shim it backwards deeper into the cluster gear (.040-inch) with Rear pinion shims.
Blahblablablah
Geeeeez i can't remember all the stuff we used to do to Muncies to try to get them to run As well as an 18-spline A833 without any mods.
Burntorange70 got it right perfectly.... "There just "bashing the enemy". We do it all the time to them. Chevy's suck! LOL Just car guys being car guys is all."
I say good for them, I can take it.