Troy Bilt Pony Riding Mower Problems

[artrip]

I have a troy Bilt Pony Riding Mower Shift on the Go Transmission and need help Does anyone know what is causing this tractor to release from gear to a clicking noise while going downhill? tractor breaks from gear on almost the slightest down hill pressure. Runs great uphill and level ground. can someone tell me the problem?

 

[dbiddle4494]

I have 2005 Troy-Bilt pony won't change speeds mower run slow hold back on clutch pedal mower flys,changed belts changed pulleys I don't understand why the shift on th fly doesnt't work correctly.
Ihaven't replaced the ilder spring or the main spring they both look good. any ideals?