Hi ,
8011 Crystal is quite good tractor. Motor is without problems.There are some problems with bearings, mainly in gearbox, if some is bad so you can hear loud noise. Well, there is two-step powershift, it is good to check gear oil pump (replacing is not easy). Try shifting all gears, it is not like with synchro clutch.
If you want to use that tractor for many hours a year, look at some with newer cab with lower noise level.
Miro