My last truck, same as the one I have now had that exact kit.
I wondered about the "not for diesel" thing too.
So I bought the kit and figured I'd deal with whatever
diesel trouble I came up against. I had no troubles at all.
I'm thinking it may be related to cooling issues, and I
had none of those either. My suggestion is, if you want
a body-lift? Go for it. Mine was a piece of cake. Although,
I did mine in a shop with overhead hoists and **** so it
was easy. Took two of us less than 8 hrs, including
sweeping up about a 1/2 a wheelbarrow worth of mud.