"clutch pedal heavy"
This can be caused by a problem with the 'power spring' on the clutch pedal .Suggest you Search for more info.
https://www.youtube.com/watch?v=YfjD4a_m900
This is much cheaper than a transmission job !
"I st & 2 nd shifting sleeve" That is not the correct term. IF he means the 2nd gear synchromesh (??) ,it is unlikely he has the equipment necessary to rebuild the 6speed transmission. There are only a few places in the country that do that job & it is thousands of $.
Suggest you clarify,report back and do some more research using the correct terms.
It may be much more economical to find a good ,used transmission?
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