I'm swapping a TH400 out of an '86 CUCV Diesel (6.2) into a 1990 K5 Blazer with a 5.7 (Gas). The problem is that the torque converter from the Diesel is a 6-lug design and the flywheel on the Blazer is only a 3-lug. Will I have to purchase a new converter to mate up to the 350's flywheel? I've look at the specs on earlier 350's mated to a TH400 and have found a few, but the only difference being is that the 1990 5.7 has the one piece rear seal. What do I do now? I known that the converter from the original 700R4 will not go onto the TH400, so that leaves either finding another converter (more $$$), or finding a flywheel that has 6-lug design that will bolt up to a newer 5.7. Is the 4L80E (newer TH400) the same as the '86 TH400? If so, does anyone make a flywheel for the newer 5.7 to bolt up to a 6-lug converter for the 4L80E? (Damn, all these different numbers are confusing as hell!) Any and All info would be appreciated!!!