We have a shed load of Used 89-96 Corvette ZF S6-40 Transmission Cases, these are the front main cases, some come with bearings, which you have to consider, they have sat for 20 + years, so likely the bearings are trash is even included, but we are selling the cases, which are just dirty,. no damage and all probably very low miles. 

I have had in stock for 20+ years and have probably close to 20.