Hey guys need some expertise, I swapped a 4.2 into my SWB classic(3.9). I was talking to a rover technician today about swapping this engine in my chassis. He started talking about a certain year 4.2, 4.6, or 4.0 that wouldnt work with the 3.9 transmission. If someone could confirm this bit of information that'd be awesome, the 4.2 came out of a 1994 LWB.I havent finished the swap yet, but i have bolted the torque converter to the flywheel and it seemed fine. He said there is a difference in the lenqth of the crank or something causing pressure problems with the transmission.