Black'69

Is there any adjustment on a stock 4-speed munci shifter. I'm having some issues with it popping out of 3rd gear. It mainly happens when I'm upshifting into 3rd. Sometimes it will not stick and pops out. Really suck whne you on the hammer.
Any tips?

Christ
FYI, It's a '69 427 390 hp.

jimvette999

IMO, If you find the shifter is not the culprit and it probably isn't, it's likely the teeth on third gear that the syncro. sleeve rides on are worn at an angle which happens over time. This allows the sleeve to "push-off" the gear due to the taper of the teeth. As far as the adjustability of the shifter, you can adjust them using a centering pin and selecting the gear and adjusting rod length for full engagement. I hope that's what it is.

gkull

My 61 Vettes Saginaw 4 speed used to jump out of third gear. I learned to hold it up in gear. The tranny needs a rebuild. Just like Jim said. Helical cut gears cause side thrust. So the internal part ware with time.

bashcraft

My muncie was doing this in 2nd gear. I too thought it was synchronizers. Had it rebuilt and the old synchronizers were perfect. I put new ones in anyway, but now it's popping out of 3rd. The shop that rebuilt it assures me it's just the shifter out of adjustment. Now I just need to crawl under there and adjust it.

jimvette999

This is not right gear but it shows the syncro teeth on the right side of the gear, these are what wear at an angle. You can have new syncro rings and sleeves but if these are worn enough at a slant, the trans. will try and jump out of gear. Let's hope the shifter adjustment fixes your trans. too.

Black'69

Thanjs for the input guys. Looks like I'll give the adjustment a try and see if it works. Otherwise, it may be time for a 5-speed upgrade
~C