Hello Roy, It`s hard to go by case casting numbers, even the GM parts guys can`t tell you what they mean. If I follow you right, you dropped the used tranny, want to disassemble both and put the guts in the burnt out one. If you`re gonna tackle that, you may as well get an overhaul kit, cause you`ll ruin the channel plate and valve body gaskets for sure. I don`t know how familiar you are with these units, but their not a real quick easy tranny to work on. If you haven`t done one before, the likelyhood that you`ll miss something is pretty good. That`s not an insult, just the GM front wheel drives aren`t like anything else out there.
I would suggest, cutting your losses and finding a different used one. The 91 is the early 4T60E, at worst, you may be running alittle different gear ratio, or stall speed. In 91 the computer shouldn`t pick it up. In some of the later ones, if the gear ratio was changed, the computer would think the tranny was slipping. BTW you don`t want to press out the converter reactor, it`s bolted in from the front. Whatever you do, I definately agree that you don`t want to mess with much in that dropped tranny. I`ve seen em drop on one side and crack on the other. Plus there easily could have been damage to internal parts as well. Jsut wondering, how did it fall to break the converter reactor? That`s pretty beefy, and it`s tucked way back in the bellhousing. Good Luck, maybe Allen will jump in with some sound advice for ya. Later Brokenwrench
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