Used rusty offroad springs and 2 inch blocks for rear. My u joints where fine for the first 4 days now started making some sounds. I have lowered the t case a inch now did I go to much? what should i set it at

1" is fine for the T-case drop. In fact that is good for all the way up to a 4.5" lift. Thats what I got with my 4.5" Rusty's lift.

what should i check now? lowered it and louder than it was

Did you check your U-joints out. You just have one that is bad. The increased angle caused by the lift will cause abad U-joint to make more noise.

yes i have checked them out someone said the actual drive shaft slide might be bad and to get one from a yj

You dont need a tcase drop at 2 inches.

all around it raised the jeep 3 and a half inches with the before and after measured

Does it make noise all the time or only when accelerating? I am going to guess you probably have some bad axle wrap going on especially if you have those blocks on some old worn leaf springs.

Watch the driveshaft and axle in this video. Really bad axle wrap going on.

Great Video!
And this is why it is not recommended to use lift blocks.

Nope not that at all if u remove the shaft its self the noise is gone

No kidding...

The axle wrap causes the joint to bind.

You need to describe this a bit better...

Under acceleration? Under hard acceleration? Steady cruising? Constant? What?

And are you lifted 3.5 or 2 inches? You cannot get 3.5in out of a 2in block. Unless you are saying you added a 2in block to a 1.5in lift. I am saying this because at 3.5 in you might need to shim the axle up a bit to get a better pinion angle.

As soon as you start to go ovee 5 mph it starts whenn in 4wd its really bad

Did the block have a shim built in, pic of pinion needed to help you the most could be over shimed cosing it to get worse with the t case drop

i had 3 inch lift blocks and replaced them with 3 inch add a leaf and its higher that way than with blocks lol