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Who knows why???
Posted: Sat Nov 23, 2024 2:14 pm
by got10carz
Machined all the way around. Maybe 26-27 and had to much fun in the lathe?
Re: Who knows why???
Posted: Sat Nov 23, 2024 2:25 pm
by Dan Hatch
See if it is a narrow drum with removable shoes.
That could be one of the special driven plate we have heard of.
Re: Who knows why???
Posted: Sat Nov 23, 2024 2:35 pm
by Kerry
I think you are right in 26/7 but not a lathe modification, but the bolt holes made over size to make it fit a narrow drum.
Re: Who knows why???
Posted: Sat Nov 23, 2024 2:44 pm
by got10carz
Dan, I've had 3 or 4 of the drums you are referring. Each 1 had a older cover with slotted holes. I came to the conclusion that there wasn't a special cover. Maybe this is 1. Maybe tomorrow there will be an answer.
Re: Who knows why???
Posted: Sat Nov 23, 2024 2:46 pm
by Dan Hatch
I think the Service Bulletins say there is a special plate, but you can oversizevthe holes on a standard plate.
Re: Who knows why???
Posted: Sat Nov 23, 2024 3:04 pm
by Kerry
Slotted holes would make it interesting, it's hard enough to get a zero run out on the drive plate to drum for the normal parts.
Re: Who knows why???
Posted: Sat Nov 23, 2024 4:23 pm
by Dan Hatch
I don’t think Ford cared about runout.
Re: Who knows why???
Posted: Sat Nov 23, 2024 6:26 pm
by Allan
Whatever, it is a bad fit-up. The narrow brake drum has a narrower surface than the low gear and reverse drums. The outer diameter of the driven plate forms part of the surface of the brake drum usually. It's not there in this application. Bad news all round.
Allan from down under.
Re: Who knows why???
Posted: Sun Nov 24, 2024 11:35 am
by got10carz
No clues here. Worn clutch lugs, worn u joint square.
Re: Who knows why???
Posted: Sun Nov 24, 2024 12:26 pm
by speedytinc
Its a 26-7 drive plate with modified (larger) diameter bolt pattern.
Still usable in a 26-7 application if not for the worn out u-joint drive.
Modifying an early (pre 26) drive plate to use on a 26-7 brake drum requires the OD of the plate turned down & the bolt pattern diameter decreased.
Note the sharp edges on the brake drum. That would have chewed the edge of the band lining. As previously stated, the drive plate edge becomes part of the brake drum surface. Not obvious because of camera angle, the drum width as pictured is a good 1/4" to narrow.
Regarding run out: Not an issue If the drive plate base is square & the bushing is in spec. Remember the drive plate fits over/onto the transmission center shaft with a bushing that centers it with less than .005" clearance, it couldnt run out more than .005".
Same as the correct drive plate.
Nasty worn u-joint drive. Must have had a warford with the smaller square shaft or equivalent non OEM drive.