Hard to say what is going on. if you look in factory service manual It will show pictures of how everything is assembled. If everything is assembled and adjusted correctly the shifting should be very smooth. Can you shift the transmission by manually moving the forks? Do the shift cables have soft bends with out any right angle bends. Is the transmission filled with the correct lubricant?
Should you ever want to chat or need engine parts I have a whole bunch here.
Dennis
Neshanic, NJ
at the top of the Sourland Mountains.
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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "