Can I switch to a different suspension?

I could be wrong, but I thought the FE1 and FE2 were the same, and then the FE3 and FE5 were the "sport" suspension.

Anyway, yes, you should be able to swap to FE1 parts, and the FE1 setup is the "soft ride" suspension.

Actually I think that FE2 and FE3 are comparable as the replacement ac Delco parts reference both FE's together. I welcome more thoughts on this.

kalamarca said:

Actually I think that FE2 and FE3 are comparable as the replacement ac Delco parts reference both FE's together. I welcome more thoughts on this.

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FE1 is the soft ride suspension
FE2 is stiffer than FE1. I believe it was used on CTS's that had the performance and handling package but didn't have the sport package.
FE3 is the sporty suspension.
FE4 is what was used on the CTSV

Theres also the auto leveling shocks for the rear but they aren't called FE5, at least I dont think. I'm almost positive there wasn't an FE5 package but I could be wrong in which case some one on here will correct me.

You can change to FE1 with no problem. Some people will suggest getting the correct springs due to the different spring rates between FE1-FE4. Others will say it's okay. It's really up to you.

My 2007 CTS SPORT came with FE5 listed as "Performance-Tuned Suspension". It rides very hard. So i installed FE1 "soft ride" struts and rear springs. I wont know till spring as i dont drive it in the snow and salt up north. What i found thru research is GM offers 4 different front struts, but all share the same front spring. On the rear they offer soft or performance springs. 3 different rear shocks are offered, but are noted for 17 or 18 inch wheels. So i left the shocks as is. The V car is completely different. If you go to any of the GM parts sites you will find this info.

Thanks to all.