94 grand cherokee limited, 4.0 dead stop takeoff, whats normal?

Hi all, i'm new to 4wd & jeeps but i test drove one that had a kind of a slipping clunk downshift when i got on it hard at takeoff on pavement, is this normal for the jeep?? sorry if this has already been covered but i'm not exactly sure what i'm searching for!Thanks

please check my entry about transmissions posted 7 lines above yours "2 problems 2 solutions " by Glass