First check your connections to the solenoid; if the battery cable goes to the wrong side, the start connection gets no voltage and won't work. Make SURE you are in neutral and jump the solenoid "Batt" side to the "S" terminal and the started should kick in.
From a past post:
An update. I put in a ten tooth gear and everything was fine except that I also replaced the solenoid with the 'best' that O'Rielly has. The made in China solenoid stuck once; a junk-yard genuine Ford part is better.
I just put in a new fly-wheel and original 9-tooth starter and will see how this works. Unfortunately, this is a China flywheel too. We shall see, but for now it is fine. (AND Still working as of 8-16-12)
FYI: The starter can only go on one way and the clearance is determined by the rear engine plate and when I bolted it to the transmission bell-housing, it didn't make more than a couple thousandths of difference. Some Fords could use a flywheel shim, but not these Rangers.
Auto and stick starters are the same from the parts stores. If there is a difference from the factory, it would be slight if any. I held an auto and a stick starter-drive together and didn't see and difference - but I didn't use a micrometer to see if there were any measurable differences.
Also: ------The original flywheel and starter were on the truck when I bought it and were probably ten years old. In my experience, Ford starters last a very long time---
I also ran a 10gage ground wire from one of the starter bolts to the frame and that seemed to help.