Your 1986 Mazda b2000 truck will start up and run but wont move and you put a new cluth kit in it about a year ago you think it is the clucth?

First check the clutch fluid reservoir for fluid.Second if it is low get under the truck on the right hand side at the transmission and check the slave cylinder for leaking around the rubber boot on it.If it is low on fluid it probably is a BAD slave cylinder not engaging the throw out bearing and clutch.Typically a bad slave cylinder can cause several problems like the clutch pedal going to the floor and not coming back up,or not being able to shift into any gear but you can start the truck but it will not move.It also may be a BAD clutch master cylinder due to age or wear if the slave cylinder is not leaking I would recommend replacing the clutch master cylinder and auto zone sells the whole unti with a new reservoir for around 40.00 and you will need to bleed the system at the slave cylinder to remove the air in the system.I doubt the clutch is the problem it would have showed signs of slipping in gear or all gears long before the issue you have!In short check fluid level of clutch reservoir,slave cylinder for leaks and last resort replace the clutch master cylinder.I have experienced this and have owned my 1987 bseries since brand new 23 years!!!! I know this truck .