The '98 Explorer probably had a 4.0l SOHC engine, but good news is that the transmission bolt pattern is the same on the 4.0l OHV and SOHC engines.
So yes it will bolt in.
You will need remove the flexplate and get a flywheel for clutch operation, not sure on the starter motor, some starter motors were different if there was a flywheel ring gear or flexplate ring gear, call an auto parts store or look on line, if there are different part numbers for auto then starter will need to be changed.
You will need to get the clutch/brake pedal setup from similar generation Ranger.
Also the clutch master cylinder and reservoir, plus the hydraulic line that runs down to trans bell housing.
Your computer will have the CEL on all the time because automatic transmission is computer controlled and it is gone now, so computer thinks there is a problem.
You can get a computer out of a manual trans 4.0l Ranger
You will need to disable the NSS(neutral safety switch) wiring, which is basically just connecting them together.
If your current speedometer is run from the rear axle sensor then all is good, if there is a transmission speed sensor then there will need to be a change.
Last edited by RonD; 03-03-2014 at 01:06 PM.