Ford e350 shifter just sliding thru the positions and not engaging the gears

Bleed hydrologic fluid from clutch slave cylinder should be of of. Brake booster in engine compartment.

1997 F 150 Gear Shift Repair - YouTube

? 5:22
www.youtube.com/watch?v=MsHV09_3JWI
Oct 21, 2012 - Uploaded by DrBobaliscious
... and strengthen a broken gear shift lever on a 1997 Ford F-150.... Loose shift lever on Steering wheel Ford F150 F250 F350 E150 E250 E350

A detent is a notch or notches in a part used to keep a shifter (in this case) at a certain position. Be that an automatic or stick-shift. You can imply that the shift pattern on a stick-shift has detents for each gear as the shift lever locks and slides in and out of each position for that gear to work when the clutch is released. The detents on an automatic can resemble "steps" which engage a different gear or series of gears(drive) when a certain step is locked into position by a pressure bar or pressure lever.

Sometimes the pressure bar or pressure lever is spring loaded and your hand works against that tension to select a gear or function(drive). There may be an adjustment for the spring tension, or the spring is too weak and the shift assembly must be replaced.

With electronic shift solenoids, some of the shift assembly is different than with the old-style mechanical shifter. The action may be fly by wire with electronic shifts.

I do not know what you have, so there may be differences.

Do you have your foot on the brake when trying?

yes it is either from gear selector itself or at the transmission ,

Your shifting block in the transmission is not working properly. replace it.

Ok, I guess its going to be a not too obvious solution then. All we have to do is find it...
1.What type of gear shifter is in your truck. Column or tower
2. Is the tail shaft turning when you try to move the vehicle
3. Does the vehicle try to move at all
4. Is there any noise from the gearbox or clutch area
5. Are you certain the clutch kit was the right one
6. Did you try the clutch plate on the gearbox input shaft spline
7. Is the release bearing clear of the pressure plate fingers.
8. Does the release bearing carrier slide freely on the retainer on the front of the bearbox, and did you apply lubricant here.

If the vehicle fails to engage in any gear and feels loose the shifter cable is broke.This cable isn't easy to replace, you may want to have a mechanic replace it if your not familiar with it.

You'll need to get under the truck on the side of the trans (driver side) there will be an adjustment, looesen it move leveler all the way to park and tien nut.