its alot easier to just back off the spring tension and it will lower the sled, take a peice of duct tape and wrap around the top of shock to keep spring collar in place then simply bolt a peice of nylon strap on each bolt and this limits it from coming all the way up. The rear is same way, just back off the spring tension and it will lower right down. And you can also double stack the bottom of the transfer rod spacers it will squat the rear right down real quick.
The whole thing your trying to achieve is more track on the ground, so lay down beside the sled and lower the front and rear to get the most track to lay flat on the ground at 1 time.