BTW, when did the big clutch larger flywheel begin, Bronco ?
John
1965 Galaxies, trucks and probably others. That’s why the small block, large diameter manual trans. flywheel(BOSS 302,etc) originally used the C5TF-A nose cone until about Jan-Feb of 1970 with the C7AF-F starter, then went to the DOTZ-A (NO ribs) nose cone at about the same time they started using the D0AF-C starter, replacing the C7AF-F starter. Small block, Small diameter manuals and about all automatics used the C3OF-A nose cone until 1970 model year when the D0OF-A nose cone started then the D2(ribbed)nose cones. Confused yet? There is also a D0AF-D nose cone for a large flywheel manual that has the ribs, but haven’t seen enough to determine their usage, the few I’ve seen are dated 1972.
Top cone in picture is the C5TF-A, large flywheel manual trans, bottom is the C3OF-A. The C3 is about 1/2” longer than the C5TF from mounting flange to the bushing end. The overall thickness of all the nose cones is pretty much the same at ~3.5”.
Second picture is the C5TF-A and D0TZ-A that replaced it.