Yeah,
My 99' 777 was leaking AFT from the PTO gasket. Torque'd the studs slowed the leak but the PTO had 110k miles and over 6k hours on the POS Muncie. It started slippin so bad had to replace. Upgraded to the chealsea PTO.
Durring the swap-over discovered a couple thrust washers had disentigrated and the casing was spitting metal into the tranny.
$1500, 6 hours, and a case a beer later and that beaatchhh was fixed and running tits up again.
Good luck!
Give me a shout if i can help,