I put 4 inch blocks replacing the stock 2 inch blocks. Installed 2 1/2" keys in front. When the truck is level, it rides terrible and tears up cv's. I lower it an inch and those issues go away. Any ideas why? What is the sense installing torsion keys if they are not doing what the manufacturer said?

 

what manufacturer are you talking about and what did they say?

 

Rough country. I have not contacted them yet. I just discovered issue this morning and had to go to work.

 

Sounds about right.
Take out the keys and put the stock ones back in. Your problems will go away.

 

Yeah, that's what I thought? Any way to get the front even with the back? Take the 4 " blocks out? Lol

 

That's one way.

Unfortunately, thats why lift kits for IFS torsion bar trucks are so expensive. To gain the height, without screwing up the geometry of the suspension and operating angles of the axles, a quality kit will lower (away from the frame) the whole suspension and front driveline. It keeps everything operating within it's designed limits.

Simply cranking up the torsion bars is the same as putting a jack under the frame of your truck, and jacking it up to the point where the wheels are ready to leave the ground. Your suspension and driveline will be at it maximum droop, with no where left to move.

The keys aren't really designed to lift a truck.They are actually designed to add preload to the torsion bars to carry more weight without sagging. To bring the front back to level with add weight of a plow or something along those lines. That's where the "leveling" part comes in.

You could probably lift the front of your truck with the torsion bars only about 1 1/2" and be at the upper limits of what it can handle.

That's also why a body lift is a popular choice. Stock ride, cheap,and still get 3" of lift.

 

Thanks. That explains alot. I may just make the front up 1.5 and leave the back up the net 2 that it is and drive it that way. 1/2 off is barely noticeable.

 

Here is a great read on torsion bars. It from a GM sight, but they are all the same concept.

http://www.gmfullsize.com/tech/torsion401.html