Down shifting when I shift hard from third to second it grinds every time.

SORRY BIT IT SOUNDS LIKE REBUILD TIME TO ME

I'm a little confused on your description of the noise. If I understand you correctly It is making the noise when it shifts smoothly into gear but at the same time it makes a grinding noise ? It possibly can be synchronizers if the grooves on the inside of the synchronizers are worn bad enough to where the gear isn't slowing down enough causing a grind as the clutching teeth on the gear mesh with the synchrode and the shift collar.
If it is making noise in all gears except 4th you may have countershaft brgs failing. The power flow in 4th gear goes directly through the mainshaft and has a 1 to 1 ratio. All other gears the powerflow goes through the countershaft causing a load on the countershaft so if you have bearings failing in the countershaft you will hear noise in all gears but 4th.
i hope I understood you correctly .

maybe your forks and or linkage is bad or not right for your ranger depending on what kind of kit you got hope this helps

1999 dodge 1500 5.2 will not shift to second once the engine reaches normal temperture or I shift from drive to nutural and back to drive then it will work fine untill the next time I stop. filter, fluid, shift slenoid,governor sensor have been replaced.

sounds like the syncromesh has gone in the gearbox. If you dont want them to grind, you,ll have to double declutch. I f you cant do this, get a new gearbox.

stop shifting so hard. your reverse gear is the same exact gear as your first, so if you shift hard and grind that gear a little then reverse will be harder to get into. you probably need your transmission rebuilt the harder your engine has to work the more its going to bogg down

Valves likely hanging up in valve body. There is a kit made by TransGo that is works wonderful for the shifting/calibration issues - as long as there isn't something else failing within.

Has the transmission been serviced? A transmission oil change and lubricant additive may help, however, it sounds as though you have a 3rd gear synchronizer going bad. Verify the shift linkage is not worn and is secure at the shifter and transmission be for spending any cash. If the linkage is good and the fluid change does not help after 150 miles, you might want to visit your favorite transmission shop.
Good luck and let me know.
Regards,

It sounds like an internal transmission problem The syncronizer that slows down or speeds up the gear to make a smooth engagement has wore down. There is no easy fix. The transmission has to come out of the vehicle and be repaired or replaced with a good used or rebuilt one.

the clutch is sticking could be worn out or needs adjusting