727, Griner low band apply transbrake will not hold the car at the starting line. The electric side is ok because I can back up with it. I went down the track after it rolled the beams and all 3 gears seemed OK, but above about 2000rpm the car rolls forward with the brake applied. I wish it was something easy, but high gear clutch pack or it's sealing rings seems like the likely culprit. What else to check before pulling the trans? Any easy checks or fixes other than remove and teardown?
Thanks