That's exactly what happened to my 84 a few years ago. The sliding hub
for the 3rd/4th is broken. The transmission is in need of rebuild.

David

--- Bill MacLachlan <billmacla@GMAIL.COM> wrote:

> Hi all...
> I've lost the abiltity to shift gears. Was working fine this morning
> but after an hour and a half freeway drive I shifted down to third to
> go up a hill, and couldn't get back into fourth. We've pulled over
> have let things cool off, and shifting is still not possible when
> stationary. I've got 1st ad 3rd. That's it. I've been under the car to
> gently assist the shift linkage but I want to be sure I'm assisting in
> the right direction.
> Air cooled transmission with the two golfball thingies on the linkage.
>
> Comments?
> BillM 82 GL I4
>

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