[Zoomad75]

Rough country still sells a spacer kit for the trans cross-member. Though many have taken the stock spacers the trans cross-member uses on top of the frame for correct clamp load on the bolts and put them below the frame to drop the mount down.

Don't do that. Using a spacer like that puts an intense load on the frame in 4 very concentrated points. Cracks will occur.

As mentioned above, the factory spacer above the frame allows a longer bolt to get a sufficient amount of "stretch" and clamping force to hold the trans cross member to the frame.

If your driveshaft angles are that far out of whack to need to drop it down, use flat stock or square tubing to allow the force of the cross-member to be distributed evenly across the frame.

I've dropped mine about 3/8" with flat bar stock to lessen the rear shaft angle. While it might correct the rear angles, it will always make the front worse. If you have the later style front shaft with the flange mount at the t-case you will need to clean off all the nubs on the c/v cage and flange anyway.