I put one of Mark's 229 cams in my 4.0 that I rebuilt. Just broke it in yesterday and it runs good (sounds healthy at least).
After the 30 minute break-in, I took the truck for a drive. I couldn't really gather how it ran, as one of the transmission cooler lines popped right off the cooler 3 miles down the road.
I spent a few hours cursing on the side of the road getting eaten with mosquitos trying to get the hose to click back on, but ended up just breaking the metal tube clean off the cooler. Admitting defeat, I had the truck towed back home.
I found a replacement cooler to drop in and will cross my fingers that the few seconds it took for me to realize the trans was not pushing the truck didn't burn up the innards of my auto. Knowing my luck, the transmission is permanently destroyed. However, I hope the cam makes for pleasant Rovering when I get this bullshit sorted.