tranny problem... please help!!

[SVX]

i bought my first svx back in april and i am now regretting the purchase. the fellow who sold it to me said that he had to drive it for several km with the dummy wheel and didnt know about putting it in 2 wheel drive mode. about two months ago i pinned it at a light, spun a front wheel and that was it. it still drives but makes a clunk.. clunk.. clunk sound as we go. i read in a thread a while back that a certain gear can sheer right off from where its mounted in the tranny or transfer case and that sounds like it might be the problem. since i bought the car ive wanted to swap to a 5 speed, a few guys pointed me in tomsvx's direction and said to talk to him about the swap and acquiring parts. i messaged him but got no response and have since become discouraged and decided to sell the car. i will probably try to replace whats broke b4 i sell it and i was hoping someone might have a similar problem who could give me some insight, thanks for your help!!