Muncie issue

[Jimlt4383]

Originally Posted by Andy

I’ve got an M20 Muncie in my 67 Camaro. I bought it completely rebuilt from a reputable builder and it’s got around 8-10k miles on it. It’s currently behind a 525 HP 406 small block. My problem is when I am in 3rd gear, and I decelerate while leaving the trans in gear, it pops out of gear. What would be causing this to happen? It’s very annoying and I want to fix it.

Thanks.

Look for wear on the little gear teeth or slider teeth that slide on to them to engage 3rd gear. I usually replace the slider and gear at the same time. It's not that bad of a job.