I am wondering if I am having a similar issue.
I recently had to replace the TO bearing on my '03 Baja. The old one had finally seized and was chewed up significantly. I purchased a new clutch kit from Napa Auto Parts, and it didn't mention anything about a sleeve in the kit, nor did it include one. The new bearing seemed to be a snug fit.
Recently (as within the past few days, though I replaced the clutch weeks ago), I found that I could not shift into 5th gear, and occasionally could not shift into 3rd, either. If I pulled over and turned off the car, then I could work the shift lever through all the gears. I then started driving again, and had use of all gears. Stopped again at another destination, started driving again, and again I could not get into 5th, until about the third time after downshifting back into 4th gear.
It feels like a synchromesh problem, since it feels like it's trying to grind if I try to shift. I do notice, however, that the engine RPMs definitely drop, so I assume the clutch is doing its job and disengaging the engine from the transmission. This NEVER happened prior to the TO bearing and clutch replacement. I'd really hate to have to rip this thing out again...
If it a synchromesh problem, does anyone know of a source for these parts, or is it more advisable just to swap out the gearbox? While I have not done a great deal of research yet, they seem rather pricey, considering...
Any ideas you can give me on this subject are welcome and appreciated!!