Auto gearbox filter and gasket kit

[Mike]

Hi guys. I have a 1999 auto Wizard which is slipping when the gearbox is cold. I've tried changing the fluid and adding some Lucas additive but still does it. It seems fine when the 'box is warmed up (which doesn't happen all that much with the short runs here). Is there a kit with new filter and gasket available? Can the bands be tightened? Does anyone know the torque settings? (I assume the 'box is the same as in the 3.0 diesel Bighorn/Trooper).

Thanks,
Mike