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Hi, I am a new member asking for help concerning my Torqueflite 727 in a 78 Powerwagon. It has a HP 400 CID @ about 460 hp. My trans has been back to the repair shop 5 times now with the revearse band servo piston broken. This happens shortly after rebuild 10 to 30 miles of driving. The shop service manager is ready to give up and refund my money. The tranny has a Transgo RV shift kit installed. Is their a HP piston assembly available ? They have even replaced the trans case and completely rebuilt from scratch. Any ideas ?

Thanks,