RK24 range shift not working, transmission not going in gear

[weekendsarge]

While doing backhoe work went to move tractor and it would not move. I had this happen last fall and found the roll pin that holds the shaft and lever together had fallen out i was able to replace the pin with a bolt and nut, this time the shaft will move but it will not engage wheels all other hydraulics FEL and BH work fine. Last month I checked the mounting bolts for the transaxle and found 2 had broken and 1 was stripped out I was able to drill one of the broken bolts out and rethread it and the striped one to use the original size bolts on the last one I had to go up from 14mm to 3/4 " but kept the same length. these mounting bolts (5 on each side) have loosened on the tractor several times since I have owned the tractor causing the transaxle to twist. Question is: Is there some switch or fuse that I could have broken while fixing the broken bolts or will the transaxle need to be replaced or rebuilt
and how difficult is the axle to rebuild (I have a copy of the parts catalog but not a "how too manual")

 

[weekendsarge]

Update: tore into transaxle found that the range fork had snaped off, after searching the net called RK preplacement part due in 2 or 3 days