Ticking from the top of the engine can come from a number of different sources.
When you changed the lifters, are you certain you adjusted them properly? Hydraulic lifters have to be adjusted such that without oil pressure they’re within the operating range of the lifter, such that when the oil is pumped in it becomes the matter on which the lifter operates. Failure to do so results in the lifter either being unable to “stretch its legs” to allow the contained oil to do its job in filling the space between the lifter and the valve stem (or camshaft lobe, depending on the engine design), or cause them to bottom out, eliminating the oil as a “cushion” during operation. Either can do major damage to the camshaft and its components.
Ticking can also come from worn or damaged cam lobes. Long term operation with misadjusted lifters can be a cause of this. Some engines require periodic readjustment of the lifters, although I’ve never heard of this on an engine with hydraulic lifters. But it is something to check out.
Ticking can also come from a leaky gasket. Do you have any other symptoms, such as overheating or exhaust smells in the cabin?
George’s suggestion is also a good one to check on. Mixing of the fluids can do major damage to not only the engine but also the trans.