What year is your car? A C4 will slide right into a 63-65 and will fit a 60-62 with some bumbing with a BFH. The AOD is a different story. The firewall doesn't need cutting but the tunnel may.

If you change your rear end or the tranny, you will need to shorten the driveshaft. The Ford-O is shorter than a C4 or AOD. The 8" or 9" rear has more nose than the stock six rear.

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Patrick Brown

62 Falcon - 331 stroker - C4
TFFN no more!