MTFCA Forum

Does anyone have a copy of Service Bulletins where it has to only install one bushing in brake drum. I am away from my Bulletins and someone ask me about that. Think it was late 25. Can you please post it here? Thanks Dan

November of 1925 - paragraph 119.

I disagree with omitting that 2nd bushing.
That puts all the load/weight of the drum pack on the smallest & fastest wearing bushing.
Ford omitted this in late production. To save 1/2 cent per unit? Why the change after 13 or 14 million units?
If you have rebuilt the transmission correctly, alignment wont be an issue.

Thanks Steve, I’ll look it up when I get home.

I agree with you, John but its worth pointing out that the 26-7 style driving plate is captured inside the brake drum and is way more secure than the earlier version where there is always a degree of slop in the lip that secures the driving plate to the brake drum, making the second bushing a necessity to hold alignment.
I have heard of rebuilders omitting the middle bushings thinking its not necessary even in pre 26 transmissions because Ford omitted it in late 25. In my thinking that is a big mistake.
BTW its pretty easy and inexpensive to make a driving plate alighment reamer pattered after the KRWilson reamer that indexes off the two brake drum bushings. Ive made a couple.

After they omitted the rear bushing I’m pretty sure that a matter of months later they began installing it again… It’s not good engineering to leave it out. The driven gear shaft needs that extra support.

Can you verify your assumption, Adam ?

I too have seen late original drums with one bushing installed .
However I've always installed two .
Makes more sense to have two installed rather than only one with the amount of load on main shaft, two share the load.

My high school drafting teacher told us; "Engineer may design it but takes a machinist to make it work".
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J and M Machine wrote: ↑

Wed May 15, 2024 8:55 am

My high school drafting teacher told us; "Engineer may design it but takes a machinist to make it work".

Give them what they want, in place of what they ask for.