I would bet that the case is not cast iron but cast steel. Touch it with a grinder. If the sparks are yellow then it is steel. If they are orange it is cast iron. If it is steel I have had good luck just making a steel patch out of 1/4-3/8 plate. Then just weld it over the hole with 7018 rods.
I would be more worried about where the broken pieces went. If some of them are inside then they may get picked up by the transmission and break things in there.
It being a 1991 you should be able to find a good used transmission to replace yours with. I guess it would depend on how good the truck is. IF you plan on running/keeping it for a long time then I would replace it.
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Today's Featured Article - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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