1939 transmission in a Model A Ford

[Charlie Stephens]

Originally Posted by Tiny

There more than one way to skin this cat. I just picked up a 32 B transmission case that I plan on putting 39 gears in. The gears fit right in the B case and the B case is a bolt on to the A motor, no $$$$ adapter needed

You are headed down the right path but remember you still will need to make a bracket to mount the brake and clutch pedals and a bracket to mount the wishbone. Depending on the year off your shifter tower you may need to make bracket(s) to mount the emergency brake ('32 had the threaded bosses to mount the emergency brake but later shifters did not).

Charlie Stephens

[d.j. moordigian]

I made this up for my 28 CCPU,..so it looked correct in the cab. It will sit
on my restored 39 transmission with the restored cover..

[Tiny]

Originally Posted by dalton

I hear ya! I'd be really interested in learning how that's done.

Originally Posted by Charlie Stephens

You are headed down the right path but remember you still will need to make a bracket to mount the brake and clutch pedals and a bracket to mount the wishbone. Depending on the year off your shifter tower you may need to make bracket(s) to mount the emergency brake ('32 had the threaded bosses to mount the emergency brake but later shifters did not).

Charlie Stephens

Thanks Charlie that's good info I had forgot about.

[TradModelA]

Looked at my 39 trans lastnight and found I have the late 39 gear set which is the better one or so I hear. Any one have B case the want to let go of?

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[d.j. moordigian]

Originally Posted by TradModelA

Looked at my 39 trans lastnight and found I have the late 39 gear set which is the better one or so I hear. Any one have B case the want to let go of?

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Ya....

I don't understand why people don't show there location...

[TradModelA]

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Originally Posted by d.j. moordigian

Ya....

I don't understand why people don't show there location...

Was not intentional, I'm in North Florida.

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[CarlG]

Modify your profile to show your location.

[Bud]

Gentlemen,
I have done the conversion of putting 39 gears in a 32 case and used the B flywheel housing. This was all in conjunction with a B motor and regular (non-cutoff) B oilpan.
I got it all to work but here are the "little things" those that recommend this conversion gloss over:
The starter location on the B flywheel housing (the short half housing, the pan makes up the other half) is in a different location than on an A flywheel housing. Your starter switch pushrod will not line up with the hole in the firewall! I had to make a S-shaped starter switch pushrod to compensate. The starter is higher and closer to the engine.
Also the B flywheel housing is narrower than an A by about .38". I had custom motor mounts made up because I wanted to mount similar to the A--I don't like Float-A-Motors because they don't take the thrust from the rear axle, thus forcing this thrust thru the brake rods and rear spring and shackles.
Also, it is quite difficult to get the 39 gears in the 32 case, not impossible, but it takes significant effort.
One other thing I don't like, but does work is the wishbone adapter. It is exposed to the elements. I reconfigured mine to have the felt lubricating pad still there, but I do not like it exposed.
I recommend a 28/16 cluster to main shaft ratio. I used a 29/15 and it was a little too much reduction. the 29/15 tooth ratio is a truck ratio.
I think a better conversion is if you have an A engine is to stick with the A flywheel housing, & go with the aluminum adapter to the later V8 (not 32) transmission case. Note that the aluminum adapter may need to be machined to follow the perimeter of the flywheel housing at the bottom so the radius rod and other components clear at the bottom. This way your starter will line up, you can use your A motor mounts and any gears you get will fit easily in the case.
Just my experience. Your results may vary.

[TradModelA]

Thanks Bud, for the words of wisdom.

[jim1932]

........... and no one is questioning how you get a Tudor fourbanger to do wheelies????

[HenryJ]

When bolting the B flywheel housing upper part to the back of the A block, how is the lower part (that is attached to the B pan) used, or is it. Hopefully that question was clear- in other words, do I need a B pan and upper flywheel housing to mount the 32 case to the back of my A engine.

[Bbhf]

Marty: i just posted a few pics of the Adapter: under Clings V-8 Adapter: might help: good luck: skip

[d.j. moordigian]

Originally Posted by TradModelA

Was not intentional, I'm in North Florida.

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Too bad,..if you lived closer, I could fix you up..

Originally Posted by HenryJ

When bolting the B flywheel housing upper part to the back of the A block, how is the lower part (that is attached to the B pan) used, or is it. Hopefully that question was clear- in other words, do I need a B pan and upper flywheel housing to mount the 32 case to the back of my A engine.

1. Yes,..you need to use the whole B pan..
2. If you have the B engine your okay,......BUT, if you have an A engine your
mixing Oranges and Tangerines. The bolt pattern for the pan(at the back) is
different and the cork seal flange, that seals the REAR of the engine has a
larger radius than the A rear main..