John Deere 5210 Transmission pops out of C range.

[bentwrench3704]

Hi,
I have a John Deere 5210 that pops out of C range. I put a new shift fork in it due to wear and it is much better but still pops out on occasion. Is there anything other than the shift sleeve the for goes in that may be damaged? Any help would be appreciated.

Thanks, Al