Older Case 1450 track loader

I just purchased a 79 Case 1450, 7400hrs, that runs well, but has a lazy right track, it slips in high reverse and hi fwd, is good in fwd low, reverse low, seller tells me it needs "clutches" . Is this a common on these ? It is a great machine, got for an awesome price, I don't mind putting 3-4k into it , plus it is working good enough to clear what I need it to do now. Will I hurt the machine using it like this ? otherwise it is in great shape, no leaks , no weeping cylinders.

Older Case 1450 track loader