Hey Mike, my hope is that it will have the 8.72/6.40 ratios that the GM Heritage specs call out. The doner is a '56 6000 series Chevrolet with the corporate rear end, vacuum shift. I have measured and compared the bolt pattern on the pig and it is the same as mine so I'm hoping it will be plug-n-play. We have been waiting for the weather to cooperate so I can power wash the axle housing and pig before I remove it, I want to keep it as clean as possible so no grit gets into either unit. I'll take one of my axle shafts and compare it to the doner, if that matches then I'll move forward with removing the doner pig.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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