Shocks. I can feel every BUMP :(

[Sierra250004]

I have a 2004 Sierra 2500 LD 4wd.
I recently got 3 Inch blocks put on the back. When I went to the Goodyear place they told me that i needed new shocks.. They told me to get "4 inch Rancho Shocks 5000"(just on the back) So i purchased them, the truck has good flex and rides good offroad but on road it is pretty bumpy and uncomfortable. What have i done wrongSo what would i need to do.. My front isnt leveled out yet.. so i was gonna buy a leveling kit.. so i need the shock extenders also for this with the 3 inch blocks? Is the reason that she shocks take small bumps bad because i have only switched out the back shocks? Or maybe that the blocks were 3 inch blocks and she shocks are 4 inch shocks? would this matter? Goodyear said no? but i wasnt sure..

[75K30]

Welcome to the site:

You lifted the rear of your truck and not the front yet correct?
Know that just installing a block does not change the spring rate and will not add any additional tension to the springs. To obtain lift, it only changes the realationship between the axle and the spring. Making the distance between the two will raise a vehicle equiped with a spring over axle design.
Alright, the shocks you upgraded to when compared to the stock shock combined with the new rake of the truck is the cause of the rough ride.
The RS5000 shock is a rather aggressive shock compared to stock shocks. Bilstein is a far better choice and is valved quite a bit less than the Rancho.
I mentioned rake, and having the rear much higher than the front also adds to a rough ride.
Since the front end is low, the weight distribution is a little off, and the weight is over the front end, making the rear a little light. Believe it or not, your vehicle will handle differently from this too.
Your options:
1) Deal with it until you are able to raise the front. (keep in mind that there is much more involved to lifting the front of your truck)
2) Change the shocks to a shock that is more suitable for street use
3) yeah, thats about it.
The shock length is accurate and longer shocke are required for a lift. Your 4 inch shock and 3 inch lift is not the problem since you are not bottoming the shock out, nor are you topping it out.
I did see you mentioned some shock extenders, and this is a bad idea all around. those little posts break and bend, and these do nothing for shock compression.
Purchase the correct shock for the front of your truck when the time comes.

[animalsrule]

if you was here in this town i would say your 1st mistake was going to goodyear...they tried to rip me off once saying my car needed a whole new front end when i had had one put on it a month earlier

my best advice would be to stay away from some place that recommends one thing but wont do anything to correct the problem they caused