I have a 10 bolt rear end in my truck. it is a 10 bolt. The numbers on the casting are 67890 underneath it is a 12345 upside down from the other numbers. The large gear inside has 2 GM 9910823 15 41 5 68 . I figure the ratio to be 2.73 as 15 goes into 41 that amount. Any other info would be appreciated . Thanks. Bill Pearson


bill pearson