Found this in one of my many adventures into the internet and thought it was good info to have and share.

Posted from an article from "Modified Mustangs and Fords"

C4 Differences:

<TABLE rules=cols cellSpacing=1 cellPadding=1 itxtNodeId="19" itxtHarvested="1"><TBODY itxtNodeId="22" itxtHarvested="1"><TR itxtNodeId="28" itxtHarvested="1"><TD itxtNodeId="32" itxtHarvested="1">Type</TD><TD itxtNodeId="31" itxtHarvested="1">Model</TD><TD itxtNodeId="30" itxtHarvested="1">Years</TD><TD itxtNodeId="29" itxtHarvested="1">Specifics</TD></TR><TR itxtNodeId="27" itxtHarvested="1"><TD itxtNodeId="40" itxtHarvested="1">C4</TD><TD itxtNodeId="39" itxtHarvested="1">Dual-Range</TD><TD itxtNodeId="38" itxtHarvested="1">'64-'66</TD><TD itxtNodeId="37" itxtHarvested="1">Small-dot/large-dot valvebody with 24/24-spline Cruise-O-Matic input shaft; C4, C5, C6 casting numbers</TD></TR><TR itxtNodeId="26" itxtHarvested="1"><TD itxtNodeId="44" itxtHarvested="1">C4</TD><TD itxtNodeId="43" itxtHarvested="1">Select Shift</TD><TD itxtNodeId="42" itxtHarvested="1">'67-'69</TD><TD itxtNodeId="41" itxtHarvested="1">P-R-N-D-2-1 shift pattern with 24/24-spline input shaft; C7, C8, C9 casting numbers</TD></TR><TR itxtNodeId="25" itxtHarvested="1"><TD itxtNodeId="48" itxtHarvested="1">C4</TD><TD itxtNodeId="47" itxtHarvested="1">Select Shift</TD><TD itxtNodeId="46" itxtHarvested="1">'70</TD><TD itxtNodeId="45" itxtHarvested="1">P-R-N-D-2-1 shift pattern with 26/26-spline input shaft; D0 casting number</TD></TR><TR itxtNodeId="24" itxtHarvested="1"><TD itxtNodeId="52" itxtHarvested="1">C4</TD><TD itxtNodeId="51" itxtHarvested="1">Select Shift</TD><TD itxtNodeId="50" itxtHarvested="1">'71-'79</TD><TD itxtNodeId="49" itxtHarvested="1">P-R-N-D-2-1 shift pattern with 26/24-spline input shaft; D1, D2, D3, D4, D5, D6, D7, D8, D9 casting numbers</TD></TR><TR itxtNodeId="23" itxtHarvested="1"><TD itxtNodeId="56" itxtHarvested="1">C5</TD><TD itxtNodeId="55" itxtHarvested="1">N/A</TD><TD itxtNodeId="54" itxtHarvested="1">'82-'86</TD><TD itxtNodeId="53" itxtHarvested="1">The C5 is a C4 with a locking torque converter; D2, D3, D4, D5 and D6 casting numbers</TD></TR></TBODY></TABLE>

 

Little More info.

Quick Reference Guide to C4 V-8 Bellhousings


<TABLE rules=cols cellSpacing=1 cellPadding=1 itxtNodeId="19" itxtHarvested="1"><TBODY itxtNodeId="23" itxtHarvested="1"><TR itxtNodeId="37" itxtHarvested="1"><TD itxtNodeId="40" itxtHarvested="1">Model Year</TD><TD itxtNodeId="39" itxtHarvested="1">Casting Number/Ford Part Number</TD><TD itxtNodeId="38" itxtHarvested="1">Specifics</TD></TR><TR itxtNodeId="36" itxtHarvested="1"><TD itxtNodeId="46" itxtHarvested="1">'64</TD><TD itxtNodeId="45" itxtHarvested="1">C4AP-7976-A and C4AZ-7976-A</TD><TD itxtNodeId="44" itxtHarvested="1">Five-bolt bellhousing, 160-tooth flexplate, two-bolt starter, 221, 260, 289 V-8</TD></TR><TR itxtNodeId="35" itxtHarvested="1"><TD itxtNodeId="49" itxtHarvested="1">'65-'69</TD><TD itxtNodeId="48" itxtHarvested="1">C5OP-7976-A and C5OZ-7976-A</TD><TD itxtNodeId="47" itxtHarvested="1">Six-bolt bellhousing, 157-tooth flexplate, two-bolt starter, 289 and 302 V-8</TD></TR><TR itxtNodeId="34" itxtHarvested="1"><TD itxtNodeId="52" itxtHarvested="1">'72-and-later</TD><TD itxtNodeId="51" itxtHarvested="1">D2OP-7976-AA and D2OZ-7976-B</TD><TD itxtNodeId="50" itxtHarvested="1">Six-bolt bellhousing, 157-tooth flexplate, case-fill dipstick, two-bolt starter, 302 V-8, cable kickdown</TD></TR><TR itxtNodeId="33" itxtHarvested="1"><TD itxtNodeId="55" itxtHarvested="1">'73-and-later</TD><TD itxtNodeId="54" itxtHarvested="1">D3BP-7976-AA and D3BZ-7976-A</TD><TD itxtNodeId="53" itxtHarvested="1">Six-bolt bellhousing, 164-tooth flexplate, pan-fill dipstick, two-bolt starter, 302, and 351 V-8</TD></TR><TR itxtNodeId="32" itxtHarvested="1"><TD itxtNodeId="58" itxtHarvested="1">'75-'78</TD><TD itxtNodeId="57" itxtHarvested="1">D5ZP-7976-A and D5ZZ-7976-A</TD><TD itxtNodeId="56" itxtHarvested="1">Six-bolt bellhousing, 157-tooth flexplate, small torque converter for Mustang II only, case-fill dipstick, two-bolt starter, 302 V-8</TD></TR><TR itxtNodeId="31" itxtHarvested="1"><TD itxtNodeId="61" itxtHarvested="1">'76-'79</TD><TD itxtNodeId="60" itxtHarvested="1">D6TP-7976-AA</TD><TD itxtNodeId="59" itxtHarvested="1">Six-bolt bellhousing, 164-tooth flexplate, truck only, pan-fill dipstick, two-bolt starter, 302 and 351 V-8</TD></TR><TR itxtNodeId="30" itxtHarvested="1"><TD itxtNodeId="64" itxtHarvested="1">'77-and-later</TD><TD itxtNodeId="63" itxtHarvested="1">D9AP-7976-AA</TD><TD itxtNodeId="62" itxtHarvested="1">Six-bolt bellhousing, 157-tooth flexplate, case-fill dipstick, cable kickdown, two-bolt starter, 255, 302, 350 V-8</TD></TR><TR itxtNodeId="29" itxtHarvested="1"><TD itxtNodeId="67" itxtHarvested="1">'77-and-later</TD><TD itxtNodeId="66" itxtHarvested="1">D7BP-7976-AA and D7BZ-7976-A</TD><TD itxtNodeId="65" itxtHarvested="1">Six-bolt bellhousing, 157-tooth flexplate, case-fill dipstick, two-bolt starter, 255, 302, and 351 V-8</TD></TR><TR itxtNodeId="28" itxtHarvested="1"><TD itxtNodeId="70" itxtHarvested="1">'78-and-later</TD><TD itxtNodeId="69" itxtHarvested="1">D7DP-7976-AA and D8OZ-7976-B</TD><TD itxtNodeId="68" itxtHarvested="1">Six-bolt bellhousing, 157-tooth flexplate, case-fill dipstick, two-bolt starter, cable kickdown, 255, 302, and 351 V-8</TD></TR><TR itxtNodeId="27" itxtHarvested="1"><TD itxtNodeId="73" itxtHarvested="1">'79-and-later</TD><TD itxtNodeId="72" itxtHarvested="1">D9AP-7976-BA</TD><TD itxtNodeId="71" itxtHarvested="1">Six-bolt bellhousing, 157-tooth flexplate, pan-fill dipstick, cable kickdown, two-bolt starter, 255, 302, and 351 V-8</TD></TR><TR itxtNodeId="26" itxtHarvested="1"><TD itxtNodeId="76" itxtHarvested="1">'79-up</TD><TD itxtNodeId="75" itxtHarvested="1">D9AP-7976-AA</TD><TD itxtNodeId="74" itxtHarvested="1">Six-bolt bellhousing, 157-tooth flexplate, case-fill dipstick, cable kickdown, two-bolt starter, 255, 302, and 351 V-8</TD></TR><TR itxtNodeId="25" itxtHarvested="1"><TD itxtNodeId="79" itxtHarvested="1">'82-up</TD><TD itxtNodeId="78" itxtHarvested="1">E2TP-7976-AA and E2TZ-7976-A</TD><TD itxtNodeId="77" itxtHarvested="1">Six-bolt bellhousing, 164-tooth flexplate, trucks only, pan-fill dipstick, two-bolt starter, cable kickdown, 255, 302, and 351 V-8</TD></TR><TR itxtNodeId="24" itxtHarvested="1"><TD itxtNodeId="82" itxtHarvested="1">'75-up</TD><TD itxtNodeId="81" itxtHarvested="1">D5OP-7976-BA and D5OZ-7976-A</TD><TD itxtNodeId="80" itxtHarvested="1">For 351M and 400M with big-block bellhousing bolt pattern</TD></TR></TBODY></TABLE>