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Old 10-08-2017, 08:48 AM   #21
old31
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Default Re: Ford 150 OD Transmission install in 31 Roadster

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Originally Posted by eagle View Post
What would be wrong with this option? https://www.macsautoparts.com/ford_m...n-shifter.html
I spoke with Sue Mitchell about this trans. It would be awesome if it had an OD built in. She said that it is for faster up shifting and downshifting.

And if I wanted an OD I would mount it behind this transmission.
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Old 10-08-2017, 08:50 AM   #22
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Default Re: Ford 150 OD Transmission install in 31 Roadster

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Originally Posted by tjw View Post
Ford 3+1 transmission conversion to closed drive set up
Whos, what trans is that?
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Old 10-08-2017, 09:21 AM   #23
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Default Re: Ford 150 OD Transmission install in 31 Roadster

The pictures posted are the F150 RTS OD 4 speed transmission from Ford showing how the tail shaft has been removed and an adapter plate installed for the torque tube.
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Old 10-08-2017, 09:33 AM   #24
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Default Re: Ford 150 OD Transmission install in 31 Roadster

If you look closely at the second photo posted you'll see a couple of transmissions sitting on a bench that have (pretty sure) the MAC's Speed Shop bell housing installed. See link below to view this part. Many people use this bell housing instead of the "AA" bell housing when they install the F150 transmission.

http://macsspeed.com/index.php/produ...inium-castings
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Old 10-08-2017, 12:01 PM   #25
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Default Re: Ford 150 OD Transmission install in 31 Roadster

This might interest someone, a rebuilt RTS OD transmission;

http://hermtheoverdriveguy.com/rebui...rdrive-31-1150
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Old 10-08-2017, 02:34 PM   #26
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Default Re: Ford 150 OD Transmission install in 31 Roadster

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I'm running the 41% overdrive on my car, but it is a speedster with lighter body and the motor is somewhat more improved than yours.
It pulls this gear effortlessly even up reasonably steep hills. I'm not sure of my diff ratio as it's a quick-change, but pretty close to standard I think.
Having discovered too late that there are in fact three ratios available, the general advice was 41% for V8s and 35% for Model As. With the diff ratio I have, I am doing 1670rpm at 62mph
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Old 10-08-2017, 03:58 PM   #27
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Default Re: Ford 150 OD Transmission install in 31 Roadster

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Originally Posted by denniskliesen View Post
eagle, that is an original 3 speed transmission converted to synchonizers. There is no overdrive in that transmission. I think the OP wants an overdrive.
Yes but its geared higher.
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Old 10-08-2017, 05:16 PM   #28
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Default Re: Ford 150 OD Transmission install in 31 Roadster

It has a 15% higher gear in first and second. Third gear is still 1:1, not overdrive. Read post #21.
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Old 12-17-2017, 08:51 PM   #29
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Default Re: Ford 150 OD Transmission install in 31 Roadster

Hi all I'm new, first post but I've been lurking for several months.

I bought an RTS with the 38% for 125.00, for my 30 coupe. 1st and 2nd have higher gear set, if OD is too high for Western Mass hills I can switch to 4:11's

I picked up a 32 BB bell housing cheap. I think its the same size as a AA?

Only, the BB doesn't have the mount for the radius rods. Has anyone fabricated a mount for a BB bell, so it would work in a Model A car?
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Old 12-18-2017, 01:28 PM   #30
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Default Re: Ford 150 OD Transmission install in 31 Roadster

I wish there was a resource that would simplify all the above, and at the same time state if any torque tube modifications are needed. I get snowed in when so many solutions are being discussed at the same time. Help!
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Old 12-18-2017, 03:06 PM   #31
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Default Re: Ford 150 OD Transmission install in 31 Roadster

Check out Macs Speed Shop website. He has a bell housing available and I think an adaptor to enable retaining the torque tube.
I have the 41% F150 box in my car with an open prop shaft. It has an improved motor and honks along happily at 60mph and will pull up most hills in overdrive, only dropping back to top gear for tight corners and steeper gradients. Love it!http://www.macsspeed.com/
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Old 12-18-2017, 06:12 PM   #32
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Default Re: Ford 150 OD Transmission install in 31 Roadster

Ditto on what Al from NY wrote. I love my 27% OD but 1st gear is almost not needed unless your on a fair grade to start out.
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Old 12-18-2017, 06:57 PM   #33
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Default Re: Ford 150 OD Transmission install in 31 Roadster

I have the RTS 3+1 27% OD, with 3.78 rear, closed drive line. IMHO, that's the perfect combination.
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Old 12-18-2017, 07:18 PM   #34
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Default Re: Ford 150 OD Transmission install in 31 Roadster

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Originally Posted by wensum View Post
I have the 41% F150 box in my car with an open prop shaft. It has an improved motor and honks along happily at 60mph and will pull up most hills in overdrive, only dropping back to top gear for tight corners and steeper gradients. Love it!http://www.macsspeed.com/
Thanks wensum, I searched and read several times that the 27% is the most popular ratio. But until now, I haven't been able to find a post stating the 38% or 41% ran well up hills with a stock engine.

I'm going to make the modifications to the 38% and when I'm done, I'll let everyone know how it turns out.

John
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Old 12-18-2017, 07:26 PM   #35
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Default Re: Ford 150 OD Transmission install in 31 Roadster

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I have the RTS 3+1 27% OD, with 3.78 rear, closed drive line. IMHO, that's the perfect combination.
Carl, I've read that you and many others preferred the 27%. But they are getting harder to find.

Thank you
John
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Old 12-18-2017, 07:30 PM   #36
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Default Re: Ford 150 OD Transmission install in 31 Roadster

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Carl, I've read that you and many others preferred the 27%. But they are getting harder to find.



Thank you

John


The guy that I got mine from builds them that way using all new gears regardless of what they were originally.


Sent from my iPhone using Tapatalk
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Old 12-18-2017, 08:59 PM   #37
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Default Re: Ford 150 OD Transmission install in 31 Roadster

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Originally Posted by JRN1967 View Post
Hi all I'm new, first post but I've been lurking for several months.

I bought an RTS with the 38% for 125.00, for my 30 coupe. 1st and 2nd have higher gear set, if OD is too high for Western Mass hills I can switch to 4:11's

I picked up a 32 BB bell housing cheap. I think its the same size as a AA?

Only, the BB doesn't have the mount for the radius rods. Has anyone fabricated a mount for a BB bell, so it would work in a Model A car?
I not 100% sure but looking at pictures I don't think all the bolt holes where they bolt to the flywheel housing are the same between the AA and BB.

Bob
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Old 12-18-2017, 09:44 PM   #38
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Default Re: Ford 150 OD Transmission install in 31 Roadster

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Originally Posted by old31 View Post
I am looking to install Ford RTS 150 4 speed trans with a 41% OD.

Car is a 31 Deluxe Roadster with Snyder 5.5 head, enlarged intakes, new motor, B grind cam, FSI Zipper distributor and 4:11 rear end.

I would appreciate it if the people that make the complete 150 kits PM me with your kit info, or reply to this post so others could have the same information.

I have read everything I can from the Barn, Hamb, Mitchell, Volvo, etc.
Check out my site. I run 3:27 and mitchell od on my 31 Tudor
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Old 12-18-2017, 09:52 PM   #39
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Default Re: Ford 150 OD Transmission install in 31 Roadster

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I wish there was a resource that would simplify all the above, and at the same time state if any torque tube modifications are needed. I get snowed in when so many solutions are being discussed at the same time. Help!
Retaining the torque yes, does it need to be shortened?
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Old 12-18-2017, 10:48 PM   #40
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Default Re: Ford 150 OD Transmission install in 31 Roadster

Russ. anytime one changes the transmission in a Model A, and that new transmissoin is longer than the original Model A transmission, such as the F150 3-1 OD transmission, the Torque Tube will have to be shortened.

I have built lots of the F150 conversion Kits and every one of them had the Torque shortened. Without going to the shop to measure I think the Torque Tube and the Drive Shaft were shortened 2 3/16" .....and that is with using the AA Bell Housing. Radias Rods are also shortened.

The main reason for using the AA bell Housing is to avoid cutting into the Center Cross Member.
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