Planning on getting some keys and spring spacers to level my 2003 tahoe LS 2wd. I have been reading though the forms and keep seeing people talking about Bilstein shocks. This may be a stupid question but do you just need to replace the rear shocks or both front and rear?
Welcome to the forum from Iowa.
Whether or not you need to replace any or all of your shocks depends on what you’re doing. Many times, there is enough travel in your shocks that you don’t need to change anything if you’re only lifting stuff 1” or so.
You should be able to level things up with just adjusting/swapping the keys in the front. Why are you thinking of putting spring spacers in?
If you can shed some more light on what you’re ultimate goal is, hopefully we can get your the help you are looking for.