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1931 AA truck. I am looking for what I think is called a coupler shaft and coupler shaft gear. The gear slips over the main shaft of the transmission and fits into the first shaft(19 13/16"long end to end) off the transmission maine shaft that goes to the u-jiont. There is also a bushing for the coupler shaft that fits in the output housing. I can supply pictures if needed

Thanks for any help.
Regards, Mike