[68ric]

I have a 68 mustang with, what I think, is an extremely high ratio rearend. It really bogs down the 347 stroker that we just had built. The serial numbers on the differential tag are: CZ-F1 and 008a8931. Anyone out there know what these codes mean or is there a website where I can decode these no.'s. All the decoders I've found online are for the VIN. Thanks for any help.

[meangreen92]

Originally Posted by 68ric

I have a 68 mustang with, what I think, is an extremely high ratio rearend. It really bogs down the 347 stroker that we just had built. The serial numbers on the differential tag are: CZ-F1 and 008a8931. Anyone out there know what these codes mean or is there a website where I can decode these no.'s. All the decoders I've found online are for the VIN. Thanks for any help.

That info is on your doortag with the vin. If you post the code, we should be able to decipher it.

[engineer76]

68ric

Can't tel from what you say!
Do the following:
On a level surface, put car in Neutral, push car and count number of revs at the yoke after 1 Rev at the wheel. That's the rear end ratio. (+/- ! So if you count 3 1/4 it is a 3.27:1)

Have fun!