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02-09-2022, 11:43 AM | #1 |
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Location: AZ
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Issues w/ '39 Synchro Tranny with Mitchell Overdrive
Any ideas besides fabricating new parts or cutting my frame to make this Mitchell OD work without interference? Thinking a rod with a U-shaped channel to clear the frame and battery box or a longer shifter pivot arm linking the rod to the OD.
Running a '39 synchro top loader tranny while I rebuild my '30 tranny. The aftermarket Model A frame (I think aftermarket) appears to not match the Mitchell design. I cut off the left "rabbit ear" on the '39 tranny (two ears on the output near the U joint used for trucks in the day). Issues: - Mitchell OD shift lever interference with '39 shift lever and Mitchell OD shift pivot arm and - OD shifter rod and arm cannot clear the frame or the battery box. |
02-09-2022, 11:49 AM | #2 |
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Re: Issues w/ '39 Synchro Tranny with Mitchell Overdrive
Why not go with a cable shift from Mitchell. I have the cable shift in my 39 coupe and it works great.
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02-09-2022, 11:55 AM | #3 |
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Re: Issues w/ '39 Synchro Tranny with Mitchell Overdrive
My car is a Model A with a 39 tranny in it. Different frame.
I don't understand why my kit didn't come configured for the 39 tranny and the frame. All it came with was a modified shift tower bracket for the shift arm that interferes with 2nd and 3rd gears. No cable was provided, but the cable would hit the frame too. What a cluster. |
02-09-2022, 12:30 PM | #4 |
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Re: Issues w/ '39 Synchro Tranny with Mitchell Overdrive
What is different about the frame?
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02-09-2022, 12:34 PM | #5 |
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Re: Issues w/ '39 Synchro Tranny with Mitchell Overdrive
Good question. Looks aftermarket to me.
The Mitchell linkage was designed to pass through the areas it is hitting on my frame. Tells me that the frame is likely not original to the vehicle as it's been restored 2x since 1930. Regardless, they should have given me a modified cable pull system as I am never cutting into my frame just for a Mitchell OD. |
02-09-2022, 01:11 PM | #6 |
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Re: Issues w/ '39 Synchro Tranny with Mitchell Overdrive
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02-09-2022, 01:14 PM | #7 |
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Re: Issues w/ '39 Synchro Tranny with Mitchell Overdrive
Agree. Seems like the best option for the arm and rod, but not sure why the two shifters collide also.
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02-09-2022, 01:51 PM | #8 |
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Re: Issues w/ '39 Synchro Tranny with Mitchell Overdrive
Does Mitchell know you have a 1939 trans?
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02-09-2022, 02:07 PM | #9 | |
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Re: Issues w/ '39 Synchro Tranny with Mitchell Overdrive
From a similar post:
Quote:
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02-09-2022, 02:39 PM | #10 |
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Re: Issues w/ '39 Synchro Tranny with Mitchell Overdrive
It would be a different bracket for the 39 transmission I believe. That would probably solve the majority of your problem. They didn't make reproduction frames...
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02-09-2022, 03:46 PM | #11 |
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Re: Issues w/ '39 Synchro Tranny with Mitchell Overdrive
My Mitchell overdrive works perfect with my Model A box. Call or email Mitchell company to get a quote for the cable. Or modify as GeneBob posted in #9. I think the cable is the best solution.
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02-09-2022, 06:05 PM | #12 |
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Re: Issues w/ '39 Synchro Tranny with Mitchell Overdrive
It appears that you have a Float-a-motor rear mount. Perhaps it is holding the rear of the transmission to high??
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02-09-2022, 06:09 PM | #13 |
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Re: Issues w/ '39 Synchro Tranny with Mitchell Overdrive
One of the problems I see is the bend in your shifter places it WAY farther back than a Model A shifter, causing the interference. Mine shifter doesn't come back far enough to tangle with the Mitchell shifter and I extended the Mitchell shifter 4".
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02-09-2022, 07:06 PM | #14 |
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Re: Issues w/ '39 Synchro Tranny with Mitchell Overdrive
Wow, nice car and clean work. Appreciate the picture for reference.
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02-09-2022, 07:09 PM | #15 |
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Re: Issues w/ '39 Synchro Tranny with Mitchell Overdrive
Good catch. It is installed after the Mitchell and rests lightly on the top of the frame. Had to fabricate that float-a-motor top bracket too as it is not meant for the 39 U joint.
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02-09-2022, 07:14 PM | #16 | |
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Re: Issues w/ '39 Synchro Tranny with Mitchell Overdrive
Quote:
Someplace I have a picture of the cable setup. I will try to find it. |
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02-09-2022, 07:18 PM | #17 |
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Re: Issues w/ '39 Synchro Tranny with Mitchell Overdrive
Well, here. is one picture of the cable setup. Not the one I was looking for tho. the cable connects to the Mitchell, doing away with shifter and linkage. I will keep looking.
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02-09-2022, 07:38 PM | #18 |
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Re: Issues w/ '39 Synchro Tranny with Mitchell Overdrive
The later V8 transmissions are longer and wider than the Model A gearbox so don't expect original model A stuff to work with a different transmission. Folks have made them fit the model A configuration by adding pedal support and clutch linkages but adding in a Mitchell OD complicates things.
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02-09-2022, 08:31 PM | #19 | |
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Re: Issues w/ '39 Synchro Tranny with Mitchell Overdrive
Quote:
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02-09-2022, 08:32 PM | #20 |
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Re: Issues w/ '39 Synchro Tranny with Mitchell Overdrive
Thanks for the help. I was told to add an extender arm and heat the shifter and bend it forward out of the way of the OD shifter. Or, shorten the OD shifter. Will play with them to see.
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