Downshifting from 3rd into 2nd, sometimes it pops out of second!!!! I have heard that this might be the 2nd gear synchro. What is that and how can I fix it?
MOST PROBABLY NOT SYCNCROS!! more likely it is your over drive. I have the same situation with my 86 - after your car is warmed up do you feel like the tranny slips in reverse? Brian from S&K speed told me it is the OD unit in need of a rebuild, not my tranny, the pop out in 2nd is a sympton of the OD going bad.
The OD is not engaged. I only use the OD on the highway with speeds over 50mph.
When it pops out of 2nd gear, the shifter goes with it.
I just serviced my OD unit last week, as I do quite frequently with new fluid and filter.