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10-08-2017, 08:48 AM | #21 | |
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Re: Ford 150 OD Transmission install in 31 Roadster
Quote:
And if I wanted an OD I would mount it behind this transmission. |
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10-08-2017, 08:50 AM | #22 |
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Re: Ford 150 OD Transmission install in 31 Roadster
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10-08-2017, 09:21 AM | #23 |
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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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AL in NY |
10-08-2017, 09:33 AM | #24 |
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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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AL in NY |
10-08-2017, 12:01 PM | #25 |
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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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AL in NY |
10-08-2017, 02:34 PM | #26 |
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Re: Ford 150 OD Transmission install in 31 Roadster
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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 |
10-08-2017, 03:58 PM | #27 |
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Re: Ford 150 OD Transmission install in 31 Roadster
Yes but its geared higher.
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10-08-2017, 05:16 PM | #28 |
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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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12-17-2017, 08:51 PM | #29 |
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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? |
12-18-2017, 01:28 PM | #30 |
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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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12-18-2017, 03:06 PM | #31 |
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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/ |
12-18-2017, 06:12 PM | #32 |
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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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12-18-2017, 06:57 PM | #33 |
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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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12-18-2017, 07:18 PM | #34 | |
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Re: Ford 150 OD Transmission install in 31 Roadster
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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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12-18-2017, 07:26 PM | #35 |
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Re: Ford 150 OD Transmission install in 31 Roadster
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12-18-2017, 07:30 PM | #36 | |
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Re: Ford 150 OD Transmission install in 31 Roadster
Quote:
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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12-18-2017, 08:59 PM | #37 | |
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Re: Ford 150 OD Transmission install in 31 Roadster
Quote:
Bob |
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12-18-2017, 09:44 PM | #38 | |
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Re: Ford 150 OD Transmission install in 31 Roadster
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12-18-2017, 09:52 PM | #39 |
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Re: Ford 150 OD Transmission install in 31 Roadster
Retaining the torque yes, does it need to be shortened?
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12-18-2017, 10:48 PM | #40 |
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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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