The J-M241 ancestor is believed to have lived in West Asia, near Iran, Turkey or Iraq. In 7700 BC he had two sons, each of whose lineages migrated in different directions - one to Europe (J-L283) and the other to South Asia (J-Z2432).
Despite many lineages of J-Z2432 being present in the Middle East, especially Saudi Arabia and the Persian Gulf, some researchers have concluded that this presence is the result of a more recent back-migration from lineages that were established in South Asia. With a recent improvement to PhyloGeographer that takes bottleneck duration into account, the deeper origins of at least Z2449 are conclusively Indian.
Sublineages of J-Z2432 were first established 6200 BC and then again in 5600 BC. These early branching points may potentially lead us to a clearer picture of the migration to South Asia.
The calculated migration to Pakistan and northern India is a very rough estimate, not to be understood as a conclusive exact path. Two factors make the path calculation unreliable - lack of diversity in Y28235, Y28237 and unknown exact origin of J-M241. While the calculated migration shows Z2432 migrating from Iran, it is even possible that Z2432 was already further east - there is no conclusive evidence to rule it out, but it would necessitate two back-migrations to Syria and Azerbaijan in Y28235.
I provide the migration path anyway because it is clear that Z2449's ancestors did migrate from West Asia to South Asia where they founded many lineages around the time when agriculture was being introduced to the region.
"The Mehrgarh Period I (7000 BCE-5500 BCE) was Neolithic and aceramic, without the use of pottery. The earliest farming in the area was developed by semi-nomadic people using plants such as wheat and barley and animals such as sheep, goats and cattle." - Wikipedia
The Neolithic inhabitants of Mehgarh may have been the first dentists.
Wikipedia states that rice cultivation in Lahuradewa (S of Nepal) has been dated to 6400 BC referencing The Near-Eastern Roots of the Neolithic in South Asia.
It is interesting that this region is relatively near Arunchal Pradesh and Bangladesh, where several lineages of Z2449 are found. While the rice may have come from China, this Y chromosome lineage seems to have traveled the Ghaghara, Ganges, Padma and Brahmaputra Rivers to get to isolated Arunchal Pradesh. Perhaps they introduced other innovations from the Near East.
It is a tempting trap to associate a lineage with the more well-understood cultures of a region, in this case the Indus Valley Civilization. However this was a Bronze Age civilization limited in extent to northwest India. The diversity of Z2449 dates back to the Neolithic and extends all over South Asia to Arunchal Pradesh. So an older presence India should be considered if not favored.