Tranny is a 13 speed fuller roadranger in an 1979 gmc brigadeer behind a 671 detroit, so not exactly a powerhouse.
Full disclosure ran the tranny low on oil.....but not for too long.
Filled it up, but the splitter is sticky going into overdrive sometimes. When OD is selected, air gradually increases in velocity hissing out of the splitter slave valve exhaust until it finally will go into overdrive.
Will be fine for a couple of shift and then get sticky again.