67 Fastback getting 8.8 rear
Redness, well the panhandle drive-line shop had me measure from the edge of the tail shaft on the transmission to the edge of the flat flange yoke on the 8.8. It was 511/8" with the 727/8.8. The pictures below should give the idea of where to measure. Just be mindful that the picture below is with my old 71/4". Some shops do it differently so get it all together and call your local shop and get there recommendation on where to measure. The receipt has the spicer conversion part number for your reference. Every car is slightly different.
Redness, well the panhandle drive-line shop had me measure from the edge of the tail shaft on the transmission to the edge of the flat flange yoke on the 8.8. It was 511/8" with the 727/8.8. The pictures below should give the idea of where to measure. Just be mindful that the picture below is with my old 71/4". Some shops do it differently so get it all together and call your local shop and get there recommendation on where to measure. The receipt has the spicer conversion part number for your reference. Every car is slightly different.