Time to replace shocks?

[casual]

I'm at 145k on my 2003 2wd. I currently have a cornfed 2" spacer up front. After driving my buddies FJ I noticed it's alot smoother ride than my rig. What's the recommended milage to replace shocks for some NEW BILSTEIN 5100's!! thanks

 

[teampwr2]

Shocks wear out just like anything else .. visibly they may look fine but inside the oil breaks down and over time they lose their gas charge , also depending on use ...I wheel alot and replace on all my vehicles around 40,- 60,000 miles...or basiclly shocks are replaced about the same time brakes are done ... Shocks make a big difference ...most people dont really notice the degradation over time because its their daily driver and its a slow process of them losing performance.Shocks are cheap enough and Personally I like to keep it riding nice. just my .02

 

[MikeInNH]

I replaced mine on my 05 at about 120k miles...The fronts were bad....the rears still had some use yet, but I like to replace all the corners at the same time.

There is no mileage rule of thumb. Too many variables... But there are tests...the bounce test is a very good indicator.