Most people want to go the other way. The problem is that you lose usable power and the control over the powerband is lost. People generally dislike the 3.0+auto mix.

(aka suprathepeg, aka Sean)
89 v6 SWB truck "BLACK BEAUTY" EB valves, P&P head 30 over.
95 FZJ80. Lifted. locked and rollin on 33s (my dream machine)