Well I finally found the leak... I had to jack the truck up and inspect the transmission while running to notice fluid bubbling from a vertical crack in the flange of the overdrive housing on the passenger side. Apparently this is cause by the weight of the transfer case and insufficient support for which an upgrade is available.
I know nothing about transmissions.
I need to replace the housing and Im hoping the pros could tell me my options. I wouldnt mind throwing some money at the internal components, or buying a built OD unit outrite. Could/should the OD unit be upgraded soley while leaving the rest of the transmission stock?
The truck is a 91 W350 cab chassis that weighs 11,700 all the time. Pretty much stock with mild pump tweaks and planning to upgrade injectors/turbo eventually.
Thanks.