727 rear clutch problem

Hi, I have a '69 superbee, and recently I restored the transmission. Worked fine about of 200 miles, but yesterday the morning I had problems with 727. Suddenly, the tranny started slips. In park, neutral, drive or low, still moving forward, but in reverse the tranny brake. Accelerating fairly moves with difficulty to reverse.

Today I have disassemble and find the rear clutch discs fully burned and "bended". Everything else seems ok.
The question is: may what have caused this? Valve body problem ?

I will replace the clutch discs, but I would like to know what may have caused this. Has someone an idea where to look for a possible assembly fault?
Thanks
Alex Perussi

Attached Thumbnails
Click image for larger version

Name:	IMG_2497_resize.JPG
Views:	N/A
Size:	397.8 KB
ID:	9759   Click image for larger version

Name:	IMG_2495_resize.JPG
Views:	N/A
Size:	426.0 KB
ID:	9760   Click image for larger version

Name:	IMG_2494_resize.JPG
Views:	N/A
Size:	592.0 KB
ID:	9761   Click image for larger version

Name:	IMG_2493_resize.JPG
Views:	N/A
Size:	601.7 KB
ID:	9762  
Author: perussi