pionexxxx

I thought it was just mine drove a 69 and a 70 today my friends have (we took them for a cruise) anyway theirs also poped out of first with me and I was making sure I had it in first good there a little testy about this arent they.

stingr69

Worn clutch teeth on the gear and worn synchro sliders will cause that. They typicaly pop out if you give it the gas then back off if those parts are worn.

-Mark.

pionexxxx

so i probably just need a new clutch? because it shifts smooth

Gordonm

No not a clutch it is the teeth inside the transmission. You might need a rebuild or some new gears. Adjust the linkage first and see if that works. If not you might be in for a tranny rebuild. I put in a couple of gears in my Muncie for that same problem. I now run a Tremec. They should not pop out of gear.

Eddie 70

My four speed never popped out of gear. I have no idea how many miles were on it but never had a problem with that. It did have a slight whine in first gear when I was getting on it a little.

robertmc48

I've never had a problem with mine. About 83000 on the odometer. T

zwede

Most common cause is worn sliders and/or forks. The forks (one for 1-2 and one for 3-4) can be replaced with the tranny in the car by taking the side cover off. The sliders require the tranny be removed from the car and disassembled. If you're taking it down that far it would be foolish not to put a rebuild kit in it. New synchros, bearings, seals and counter shaft.

My M20 liked to pop out of 3rd, not 1st. Whacked my hand good a few times. I had recently done the standard rebuild kit but it doesn't include sliders and forks. Replaced those and it didn't pop out of gear anymore. A few months after that I put a tremec in it.

stingr69

The synchronizers have sliders that slide over the brass blocker ring teeth first and then the tiny synchronizer teeth on the drive gears when you put the tranny in a forward gear. Those tiny teeth on the drive gears are called "clutch teeth" even though they are not part of the clutch assy. The slider grooves get worn open after many miles of hard use and they fit sloppy. Then the tranny pops out of gear when you get on and off the gas. Time for some new sliders and/or drive gears with an overhaul.

-Mark.

mcbruce

Mine popped out of first quite a bit until I had the tranny rebuilt. I had all the syncros replaced and had to replace 1st and 2nd gears, they were badly chipped. I guess the last bubba was into power shifting. Since the rebuild, no popping whatsoever!

bkerlee

Nope - no popping out of gear here...