The Ford Barn

95476 · 11-19-2021, 07:12 PM

I am putting on open drive converted '39 box into my next 34 Ford project.
What mounting parts do I need to make the conversion ?
I have the proper 21A rear trans housing, trans main shaft, and the '46 Ford truck rubber saddle.
Thank you.

Ol' Ron · 11-20-2021, 08:24 AM

What rear axle are you using??

V8COOPMAN · 11-20-2021, 04:45 PM

Quote:

Originally Posted by 95476

I am putting on open drive converted '39 box into my next 34 Ford project.
What mounting parts do I need to make the conversion ?
I have the proper 21A rear trans housing, trans main shaft, and the '46 Ford truck rubber saddle.
Thank you.

For starters, you're going to need a 16-spline yoke for the drive shaft. I've heard that early Chevy Powerglides fit, but what do I know? DD
.

Tim Ayers · 11-20-2021, 05:54 PM

Quote:

Originally Posted by V8COOPMAN

For starters, you're going to need a 16-spline yoke for the drive shaft. I've heard that early Chevy Powerglides fit, but what do I know? DD
.

I believe that is accurate

95476 · 11-20-2021, 06:16 PM

Yes, you are correct about the powerglide yoke.
I pulled one of my stock closed drive transmissions out switched the mainshaft to the splined tailshaft last night.
I have the proper Ford rear yoke
I have the proper truck rear trans case mount.
I have the 47 Ford truck crescent shaped rubber trans mount.
What I need to know is how is the rear of the trans secured to the stock '34 frame.
Are there biscuits lke the front motor mounts on either side of the mount ears.
I can fab some mounts easily enough but I thought I remembered this being a "bolt it" deal.
Thank you.

V8COOPMAN · 11-20-2021, 06:54 PM

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Quote:

Originally Posted by 95476

.
What I need to know is how is the rear of the trans secured to the stock '34 frame.
Are there biscuits lke the front motor mounts on either side of the mount ears.
I can fab some mounts easily enough but I thought I remembered this being a "bolt it" deal.

Aren't MOST of them done that way, anyhow? DD

.

cas3 · 11-20-2021, 08:11 PM

A 34 rear mount bolts direct to the frame, no rubber biscuits, like this one here from MD. https://www.ebay.com/itm/40103433267...IAAOSw8-tWW3dA sorry, cant do no fancy computer work, so go to the link

petehoovie · 11-20-2021, 08:16 PM

Quote:

Originally Posted by cas3

A 34 rear mount bolts direct to the frame, no rubber biscuits, like this one here from MD. https://www.ebay.com/itm/40103433267...IAAOSw8-tWW3dA sorry, cant do no fancy computer work, so go to the link

Krylon32 · 11-20-2021, 09:41 PM

I've done a few of these in customer chassis but I use small rubber biscuits for a slight cushion. I can't remember where I got the biscuits.

cas3 · 11-20-2021, 09:56 PM

Thanks Pete ! sure looks better there. Also, thinking some more, just a guess here, but from the pictures it looks to me like the spacing width for the bolt holes is different, and I 'm gonna guess the location front to back is different too so you will have some hacking to do in the cross member saddle .

petehoovie · 11-20-2021, 10:34 PM

'34 Rear transmission mount installed....

deuce lover · 11-21-2021, 12:39 AM

What about the speedometer cable connection.since no torque tube? I think you will have to use the rear mount/bearing retainer off the open drive and somehow fit it to the '34 frame in order to connect the speedo cable. .

petehoovie · 11-21-2021, 01:40 AM

Forgot he's converting to open drive line....

V8COOPMAN · 11-21-2021, 04:47 AM

Quote:

Originally Posted by deuce lover

What about the speedometer cable connection.since no torque tube? I think you will have to use the rear mount/bearing retainer off the open drive and somehow fit it to the '34 frame in order to connect the speedo cable. .

It's virtually a MUST that you need to run this "21C-" (NOT "21A-") bearing retainer that Sheldon ("deuce lover") has pictured above because of the seal, as well as the speedo hook-up. The "21A-" is for a torque tube. Your '34 chassis center crossmember should look something like the one in chassis below. As you see, there are two rubber donuts there that the '34 rear bearing retainer would sit on. What you need to do is mock-up the engine/trans in that chassis with the "21C-" bearing retainer bolted to the rear of your trans case (they will all interchange on those six bolt holes). Look and see how close things align. You would NOT be the first guy in the past 80 or 90 years that had to fabricate an adaptive trans mount. You MAY be pleasantly surprised at how close things line-up. This is the only realistic way to approach this type of swap. You mock-up, and build as you go. What is this "Ford truck crescent shaped rubber trans mount" that you speak of? We're here to help ya if we can. DD

.

95476 · 11-21-2021, 12:30 PM

Thank you for all your input.
I had this setup in my '36 roadster but can't remember what was done now.
The 21C setup looks like a winner.
I appreciate you help.
HAPPY THANKSGIVING !

V8COOPMAN · 11-21-2021, 01:23 PM

Quote:

Originally Posted by 95476

Thank you for all your input.
I had this setup in my '36 roadster but can't remember what was done now.
The 21C setup looks like a winner.
I appreciate you help.
HAPPY THANKSGIVING !

Here is another picture, better-showing the details of the mount holes in that '34 center-crossmember. DD

11-19-2021, 07:12 PM	#1
95476 Senior Member Join Date: Jan 2018 Posts: 413	Open drive trans in a '34 Ford questions I am putting on open drive converted '39 box into my next 34 Ford project. What mounting parts do I need to make the conversion ? I have the proper 21A rear trans housing, trans main shaft, and the '46 Ford truck rubber saddle. Thank you.

11-20-2021, 08:24 AM	#2
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,859	Re: Open drive trans in a '34 Ford questions What rear axle are you using??

11-20-2021, 06:16 PM	#5
95476 Senior Member Join Date: Jan 2018 Posts: 413	Re: Open drive trans in a '34 Ford questions Yes, you are correct about the powerglide yoke. I pulled one of my stock closed drive transmissions out switched the mainshaft to the splined tailshaft last night. I have the proper Ford rear yoke I have the proper truck rear trans case mount. I have the 47 Ford truck crescent shaped rubber trans mount. What I need to know is how is the rear of the trans secured to the stock '34 frame. Are there biscuits lke the front motor mounts on either side of the mount ears. I can fab some mounts easily enough but I thought I remembered this being a "bolt it" deal. Thank you.

11-20-2021, 08:11 PM	#7
cas3 Senior Member Join Date: Jan 2011 Location: sw minnesota Posts: 4,571	Re: Open drive trans in a '34 Ford questions A 34 rear mount bolts direct to the frame, no rubber biscuits, like this one here from MD. https://www.ebay.com/itm/40103433267...IAAOSw8-tWW3dA sorry, cant do no fancy computer work, so go to the link

11-20-2021, 09:41 PM	#9
Krylon32 Senior Member Join Date: May 2010 Posts: 4,482	Re: Open drive trans in a '34 Ford questions I've done a few of these in customer chassis but I use small rubber biscuits for a slight cushion. I can't remember where I got the biscuits.

11-20-2021, 09:56 PM	#10
cas3 Senior Member Join Date: Jan 2011 Location: sw minnesota Posts: 4,571	Re: Open drive trans in a '34 Ford questions Thanks Pete ! sure looks better there. Also, thinking some more, just a guess here, but from the pictures it looks to me like the spacing width for the bolt holes is different, and I 'm gonna guess the location front to back is different too so you will have some hacking to do in the cross member saddle .

11-20-2021, 10:34 PM	#11
petehoovie Senior Member Join Date: May 2015 Posts: 8,117	Re: Open drive trans in a '34 Ford questions '34 Rear transmission mount installed.... __________________ The only thing nice about being imperfect is the joy it brings to others.... *"Silver rings, your butt! Them's washers!"* "We shot our way out of that town for a dollar's worth of steel holes!" - from 'The Wild Bunch' - 1969 https://www.youtube.com/watch?v=7NReUd2_0u0

11-21-2021, 12:39 AM	#12
deuce lover Senior Member Join Date: May 2010 Location: Southern France Posts: 5,305	Re: Open drive trans in a '34 Ford questions What about the speedometer cable connection.since no torque tube? I think you will have to use the rear mount/bearing retainer off the open drive and somehow fit it to the '34 frame in order to connect the speedo cable. . Last edited by deuce lover; 11-21-2021 at 12:48 AM.

11-21-2021, 01:40 AM	#13
petehoovie Senior Member Join Date: May 2015 Posts: 8,117	Re: Open drive trans in a '34 Ford questions Forgot he's converting to open drive line.... __________________ The only thing nice about being imperfect is the joy it brings to others.... *"Silver rings, your butt! Them's washers!"* "We shot our way out of that town for a dollar's worth of steel holes!" - from 'The Wild Bunch' - 1969 https://www.youtube.com/watch?v=7NReUd2_0u0

11-21-2021, 12:30 PM	#15
95476 Senior Member Join Date: Jan 2018 Posts: 413	Re: Open drive trans in a '34 Ford questions Thank you for all your input. I had this setup in my '36 roadster but can't remember what was done now. The 21C setup looks like a winner. I appreciate you help. HAPPY THANKSGIVING !