C6 transmission park function

[Falcon67]

First step it to take the shift linkage off and place the trans in Park firmly by hand.  If you can pop it out of park in that condition, then the problem is internal.  If it's a shifter problem, you'll want to fix that quickly because if it's not putting the trans in park properly it could also not be placing the internal valve in the right place - which could hurt the trans.  The primary locator for any specific trans gear is the internal "rooster comb" and detent spring lever that positions the shift valve.  Anything external has to conform to the internal positions.  On my race trans/shifters, I place the trans and shifter in neutral, then adjust the cable, linkage,etc to fit the pin easily in the trans lever.  The go to first (or low in a stocker's case) and remove the linkage - the pin should slide in and out of trans level without binding and the trans should be firmly in that gear position.  Put the pin back in, shift to park, perform same linkage test.  If it lines up in the middle (neutral) but is off on the ends that has to be analyzed and fixed where possible. 

[cammerfe]

I suppose the correct answer to the location of the 'detent' is that there are actually two detent mechanisms involved. Since the problem, as was being addressed in the thread, above, was the location of the detent PLATE, the most likely answer is that it's part of the shifter.

However, as was said just above, there is also a 'rooster-comb' detent apparatus that's part of the transmission itself. As noted just above, it's inside the case and moved by the outside-to-inside mechanism. It not only the part that moves the valves in the valve-body, it also has attached the forward end of the park rod.

Both detents must work in unison to achieve the intended result. The external arm in the picture above has such a wide variety of holes to make it possible for everything to line up.

There, I hope we've completely covered the ground now!

KS

[1976kjell]

Yes, the external and internal detent mechanisms have to be synced. My 67 C6 does not have any rooster comb style detent plate (lower picture) either inside or outside the pan, but the manual shifter in the valve body has grooves that works with a spring and ball, shown in the upper attached picture. I guess the grooves/spring/ball have the function to detent the trans inside, instead of a "rooster comb"

[1976kjell]

On my race trans/shifters, I place the trans and shifter in neutral, then adjust the cable, linkage,etc to fit the pin easily in the trans lever.  The go to first (or low in a stocker's case) and remove the linkage - the pin should slide in and out of trans level without binding and the trans should be firmly in that gear position.  Put the pin back in, shift to park, perform same linkage test.  If it lines up in the middle (neutral) but is off on the ends that has to be analyzed and fixed where possible.

Thanks for a nice explanation, but what pin are wou writing about? Do you have a picture of a pin like that?