MTFCA Forum

Question how many bushings does a 26-7 use on the brake drum ?
thank you

one

when mounted, the tailshaft provides the second one at the other end

additionally, the tailshaft face that mounts to the brake drum must be DEAD SQUARE/PERPENDICULAR to the rotational axis of the assembly. This and other traps should be thoroughly investigated and understood before assembling a T transmission. The Ford Manual, the MTFCA transmission book, and the MTFCA Forum google search is invaluable to this end, and ALL sources should be investigated and understood perfectly before big mistakes are made.

Finally, transmission main shaft and ultimately, tailshaft runout need to be as close to "zero" as possible for longest-lived and smoothest operating engine/transmission possible.

Ford left out the second one(clutch end) A cost saving measure. When rebuilding a transmission, I install both. If not, the one small output plate bushing takes all the load & is bound to wear out faster. More support, the better. That second bushing was "required" on the previous millions of units.

Ill add that not all wide drums had only 1 bushing. I have only come across the missing bushing in, maybe 10% of the late transmissions I have torn down. Less in loose swap meet drums.

There are no "bushings". There are two types. One is for the wood spoke wheels. The bolts go in from the outside with a large washer which has 6 square holes in it and a flange in the center to go around the hub. Then the bolts go through the holes between every other spoke and the thin nuts go on the inside with the bolts staked so the nuts don't come off. The hub slides right on the taper axle shaft with a square key There is one flat washer on the outside with a large nut which fits the thread of the axle and tightened to 100 ft lb with a cotter pin. Sometimes if there is wear in the taper you might use a tapered shim between the shaft and the hub.
The other kind of wheel is made for the wire spoke wheels. That kind has five lug bolts which are pressed through the hub from the inside and go through both hub and drum and pressed tight at the drum. That kind uses no bushing either. It could use a shim if necessary. It is bolted to the axle in the same manner as the other one.
Norm

Sorry! I thought you were asking about the parking brake drum.
Norm

Scott, I have a reamer that reams all three bushing at once, has the step down for the driven plate, worth it's weight in gold!

Joe Bell wrote: ↑

Mon Mar 07, 2022 12:17 pm

Scott, I have a reamer that reams all three bushing at once, has the step down for the driven plate, worth it's weight in gold!

I have never felt the need for such a reamer. I dont use reamers anyway.
Every surface gets squared up. Bushings are all bored to their respective shafts. The final check is bolting the output plate to the brake drum & transmission center shaft. No bind or extra friction proves perfect alignment of the 3 parts. (all 3 bushings) Final transmission mounting requires indicating for square & no concentric run out of the center shaft.(top to bottom) Transmission assembly & final indicator on the output shaft. .000-.002 indicated run out.

I also have that "special" reamer Joe - there's a notation in the Service Bulletins regarding the omission of the second bushing and use of that stepped reamer. I also "index" the driven plate to the brake drum after I ream them as a unit.