Welp, it's a concensus - I need to check and replace my freeze plugs - to be safe, am planning on replacing ALL of them.
Couple of questions regarding this - for the rear block plugs, is it easier to drop the tranny, or pull the engine, to get access to them? I'm not sure WHERE they are in relation to the rear of the block.
Also, other than the two usual in the rear, and 6 along the side, are there any other freeze plugs I need to look for?
I am planing to replace them with the brass plugs, to prevent this from ever happening again. Any suggestions on a good sealant to use for the new ones?
FYI, in either case, I plan to follow addidional advise for precautionary measures, to pull the pan and replace the oil pump, and rear main, just to be safe for several more miles down the road.
Final question, as someone HAS mentioned that perhaps the block is cracked - I have access to a good conection 3.9 from a 90 model.
Is there ANYTHING else I would need to swap the 3.9 V6 into my 91, other than the engine itself? Are there any differences in the wiring harness, motor mounts, ECU, etc, that I should be aware of?