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forth gear is not a gear as such but a dog that connects the input and out put shafts to make a straight through drive
reasons for jumping out of gear include gear not properly selected __check shifter connections or cable adjustment cable loose at one end not making full engagement of the dog
loose n bell housing bolts or bolts not tension in the correct order
bearing failure on input shaft , out put shaft or spigot bearing between the shafts
if you have had no problems before today, the shifter mechanism and cable is a prime suspect for failure
is the shifter sloppy? if so the isolator bushing is worn out and allowing the stick to move farther than the actual shifter which would cause the gears to not fully mesh
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.
It will probably be a bad bearing in the tranny. I've had it happen to me a couple of times, and found it easier to just swap the tranny with another good used one, than to tear the thing apart, and try to replace the bearing. The clutch has nothing to do with it popping out of gear. Once the bearing goes, the shaft runs on a bit of an angle, and won't stay in gear.
Check the gear linkage adjustment is correct.
Ensure 3rd gear throw is fully engaging when selected.
You can check this without the motor running,- depress clutch and carefully go through the gear selections - ensure when selecting 3rd you can feel selection detent (passing over the syncohub detent pawl).
If the problem persists, and no fault can be found with selection adjustment, you probably have worn gearbox bearings, or broken synco energiser spring internal to the gearbox.
Sounds to me that the shifter broke, i believe the shifter has a ball end that slips into a pocket in trans. that moves for gear selection and that ball brook off end of shifter. if its got a linkage set up most likely samething either shifting arms came off or shifter broke where linkage rods connect.
Disconnect the linkage from the tranny. Manually move it on the tranny. Does it still do it. If so you have an issue with the tranny. If not its the shifter.
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