Sounds like shift forks may be worn, either way you've got to split the case to get to it. Invest into the proper tool in removing the retaining rings on the shafts or you'll be replacing 'em with new ones when you reassemble it. A dead blow hammer worked for me in splitting the case halves along with plastic wedges. Take your time during tear down and build up, replace the hardware ass needed or when recommended in the manual to do so. 1211 Three Bond was great to seal the case halves, although 25 bucks for a small tube, worth every penny and no leaks. Clean the case seal surfaces well before applying the sealant with lint free cloth and alcohol to remove any oily residue. Follow the torque pattern shown in the manual when you marry the case halves. Order an entire engine seal/gasket kit and go with cometic for the jugs, NRHS has 'em pretty cheap. Good Luck and let us know how it goes.