[loggy]

I have a 1964 GTO and third gear " pops out "
only under a downhill lag. It doesnt do it all the time and has only started this during the last few days.

Linkage ? ( Perhaps needs tightened ?) ...or
trans ?

Appreciate your help/assistance/advice. Thanks

 

[GasTiresandOil]

I have a 1964 GTO and third gear " pops out "

From this quote alone, it sounds like the synchros in the tranny have gone out. This may just be the tip of the iceburg though when you get down into the tranny though.

 

[anmracing]

:agree

Sounds like synchros to me..... You will need to rebuild the tranny....

 

[lars]

:agree The synchros and "dogs" are worn out. Rebuild the tranny. While you have it out, send the shifter back to Hurst and have them rebuilt it, too. With a tight shifter and a rebuilt tranny, the whole car will feel like it's new. :cheers

 

[anmracing]

:agree

I agree with lars too.... :lol: