The Rancho's might be ok then, they're twin tube, so they're not going to have the same travel, but the valving on the 5000's is better than on the stock shocks, especially if they are shot.

Get them in the length ranges I listed in the post near the top of the thread...as close as you can get, use the collapsed length of 16" as you limiting factor....

...and get them as long as you can out from that point...the collapsed length is the only one that you have to watch in this case.