most of the time there is a decal or plate mounted to the dash or on the backside of the sunvisor on 70's era trucks with the shift pattern and transmission model on it. also check for decals inside glove box. When you adjust the clutch you will want to adjust the clutch brake as well. You never specifically said you were familiar with non synchronized transmissions the clutch and adjustment may be fine it may just be a matter of fine tuning your timing. shift speed-rpm drop-road speed-gear ratio= smooth shift
