Hi Scotty I have a 99 Ford Explorer Eddie Bauer edition with the 4.0 sohc. My question is when I put it in drive it will not engage but I still have reverse what could be my problem? I've already done some research and changed out the valve body gasket and the solenoids and that still did not help

it needs rebuilding, just did one of those when the sun gear assembly broke down and did just that