Grinding when in reverse and tries bogging down at lights

90 Ford Bronco II: You have to put it in whichever gear you want it in before you start it or it wont shift at all. Then once you are going its extremely hard to shift into the other gears. Reverse is the only gear that sounds like its grinding.

most cases it's a bad slave cylinder try and bleed the system just like bleeding brakes

clutch could be worn out ?
how many miles since it was replaced ?

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

My friend this sounds like a catalytic converter problem. A number one symptom in the case of a "burned up" catalyst is loss of power or as you put it bogged down. Try disconnecting at the flange if not too much trouble or simply remove the O2 sensor downstream and see if pressure changes (old trick)

The column shifter needs replaced or if it has floor shift the linkage needs to be adjusted.

There are shift solenoids in the transmission and apparently there's a problem them. I would get it to a trany shop and have it checked right away. If you continue to drive it you will ruin the transmission. Are sure you put the right computer in the vehicle? If you put a computer from a Bronco II with a manual trans in a vehicle with an automatic trans, the trans won't work right.

i had this same problem with mine and all i had to do to fix it was fill up the clutch fluid...i drove my turck like this for one year and the second i filled that up it worked like a dream. try it it might help.

is the idle speed correct? do you shift into second before trying to engage reverse?, is the clutch ok, this is most likely not the trans at all but one of the above issues, the clutch is my guess.

If I understand you correctly your vehicle will still start but bogs down...If this is the case have the catalytic converter checked if it is plugged this would cause the same conditions as you described.....