Question: what is the difference between 3 link and 4 link suspension?
Answer: 3 link requires a panhard rod or trac bar to keep the axle from moving left to right. The 3 linl is easier to fit around engine/exhaust/etc... 4 link with dual triangulation done well will locate the axle without panhard rod but is sometimes a bear to fit the upper links and the frame end of lowers.