Is there really a difference between the suspension in the RWD vs AWD IS? If so, then what are the differences? I hope it's more than spring rates.

 

bumping this

 

yes the front shock attaches differently so it's a different length. For AWD the shock attaches to a large C shaped bracket that then attaches to the lower arm. The RWD shock attaches directly to the lower arm. There are other differences, but that's a huge one. So you can't use a AWD suspension on RWD or vice versa if that's what you wanted to know.