My 83 K5 blazer originally came with a 700r4 transmission and a np208 but sometime in its life it was converted to a th350 but they still used the original TC. My question is, How much shorter is a th350 then a 700r4? The reason I ask is because they used the stock driveshaft and under any accerleration it vibrates. Now I solved the problem by making some 1" spacers to lower the crossmember but I would really like to just fix the problem right and get some more ground clearence back. I have an idea but I don't know if it will even work. The other day I was flipping though the pages of my new LMC catalog and saw that they sell a stock cv joint. So I was thinking that when I a 4" lift with shackle flip out back then I could install one of these and then raise my TC back up. This way the CV would add length to the shaft while solving my vibration problems. How much length will the stock CV add? Will this even work? Thanks in advance.