ok, i have a 89 cutlass ciera with a 2.8. i am thinking about geting the 3.8 supercharge III engine, now i am not sure if i would have to change my tranny. and if i did i am worried about my half shafts. not sure if i could get half shafts the right size to fit to my car. if anyone has some advice on this and help me out that would be great. thanks.

try l67swap.com they are pretty knowledgeable about the s/c 3800 (L67) engine and have done many swaps.