Take a picture of the rear diff cover. If it is round, it is the 35. "D" shaped, it is the 44.
Had a '00 TJ with the 5-speed. Loved it, but traded for a '14 JK.
The head issue on the TJ's has a 0331 stamp on them. They'd crack on the top side between the 3rd and 4th cylinder valves. You...