Transmission pops out of 4th gear

[RoyBatty]

Hi all,
I have started driving my '75 Spider now that I am "right" with the DMV.
It has a 5 speed that is referred to as the "late style" in the Haynes manual.
I have noticed that the transmission will not stay in 4th gear when the engine isn't loaded, pulling the car.
If I let up on the accelerator or reach a point of coasting in 4th gear, she pops right out.
Where do I start?
Thanks in advance.

[So Cal Mark]

probably going to need a new 4th synchro, hub and fork

[RoyBatty]

Thanks Mark,
Why the sad face.
It's a machine after all.
Parts wear or break down with use.
If there's parts available to fix it, then all is well.
Are these what you are listing?
http://stores.auto-ricambi.net/-strse-1 ... Detail.bok
http://stores.auto-ricambi.net/-strse-1 ... Detail.bok
Thanks

[So Cal Mark]

the sad face is merely for the amount of work and expense involved in the repairs.
Yes the synchro and fork are what I mentioned but in addition you will probably need a hub also along with a set of bearings and gasket/seal set.

[RoyBatty]

Thanks again Mark,
I am calling midwest124 about acquiring the needed parts.
Do you have any other sources that might be helpful in my parts quest?
Roy