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01-13-2021, 04:24 PM | #1 |
Member
Join Date: Jan 2021
Posts: 31
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Model A rearend conversion
Looking for information to convert a Model A rearend to accommodate a modern driveshaft yoke
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01-13-2021, 04:50 PM | #2 |
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Join Date: May 2010
Location: So Cal
Posts: 8,753
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Re: Model A rearend conversion
Here you go. https://valleymachineshop.com/model-a-parts.html
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01-14-2021, 12:37 AM | #3 |
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Join Date: Jul 2018
Location: Los Angeles
Posts: 114
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Re: Model A rearend conversion
I converted my Model A rearend to an open driveline using parts from Speedway Motors as part of the T5 swap.
You can read the whole story here: https://clampdowncomp.com/tech/insta...-model-a-ford/ |
01-14-2021, 09:26 AM | #4 |
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Join Date: Jan 2016
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Re: Model A rearend conversion
1: Potvin, at 60 what are your rpms?
2: What gear ratio is your your end? 3: Is it true that on a T5 first gear is too low, and you end up taking off from 2nd? |
01-14-2021, 12:26 PM | #5 |
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Location: Southern California
Posts: 7,032
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Re: Model A rearend conversion
Remember you will need to add brackets to keep the rear end from twisting. My advice would be a later, stronger, rear end if you are going to make the brackets.
Charlie Stephens Last edited by Charlie Stephens; 01-14-2021 at 08:04 PM. |
01-14-2021, 04:22 PM | #6 |
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Location: Kingston, Pa.
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Re: Model A rearend conversion
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01-14-2021, 07:42 PM | #7 |
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Location: SF Bay Area
Posts: 193
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Re: Model A rearend conversion
Valley Machine Shop offers a brace for the rear end when converting to open drive line.
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01-15-2021, 09:32 AM | #8 |
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Posts: 31
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Re: Model A rearend conversion
Thanks for the info!
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01-16-2021, 07:06 PM | #9 |
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Location: Ohio
Posts: 1,972
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Re: Model A rearend conversion
Some people I talk to say going to the S-10 5-speed doesn't pick up that much, and it's whole lotta work. So how much MPH do ya pick up?
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01-16-2021, 07:41 PM | #10 |
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Join Date: May 2010
Location: Durango CO
Posts: 1,309
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Re: Model A rearend conversion
Have had my T-5 for ten years and it has nothing to do with speed, engine modifications determine the increase in speed. I can run 75 MPH with a fifth gear overdrive without stressing the engine.
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No restorable Model A's were harmed in the building of this truck! Last edited by denis4x4; 01-19-2021 at 11:06 AM. |
01-16-2021, 07:50 PM | #11 |
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Re: Model A rearend conversion
Have had my T-5 for ten years and it has nothing to do with speed, engine modifications determine the increase in speed. I can run 75 MPH with a fifth gear overdrive without stressing the engine.
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No restorable Model A's were harmed in the building of this truck! |
01-17-2021, 02:33 AM | #12 |
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Re: Model A rearend conversion
It is a bit of work, but my Model A trans had bad bearings and I wasn't about to do all the work to fix it just to replace it with another A trans. For me, it was about the benefit of having a trans with syncros as much as it was the overdriven 5th gear. Being able to down shift and/or shift into first without stopping completely, as well as the closer gear spread, changed the nature of the car completely.
Last edited by PotvinV8; 01-17-2021 at 02:41 AM. |
01-17-2021, 02:35 AM | #13 | |||
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Location: Los Angeles
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Re: Model A rearend conversion
Quote:
Quote:
Quote:
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01-17-2021, 03:26 AM | #14 |
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Join Date: May 2010
Location: Southern California
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Re: Model A rearend conversion
What many of the people are overlooking is that the Model A is not a car you would like to run all day at 75 MPH. I have a '31 RDPU with 3.54 gears. It is happy at 55 MPH. It will do 75 but at that speed the front fenders act like airplane wings making it very light in the front and susceptible side winds. A good example would be the wind being pushed by a semi or a wind blowing down a canyon that crosses to road. I like it to be my decision when to change lanes. Mechanical brakes are not designed for 75 MPH. The steering and suspension are not designed for 75 MPH.
Charlie Stephens |
01-18-2021, 02:18 PM | #15 | |
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Location: Los Angeles
Posts: 114
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Re: Model A rearend conversion
Quote:
The takeaway, for me, on the T5 conversion was the syncros that allowed easier shifting around town and the closer ratio of gears between first and fourth. Around town, with the stock box, second seemed to get rung out a little farther than I preferred and third tended to be a little too tall. Splitting the difference with the T5's gearing seemed to helped a lot. Food for thought I guess... |
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01-18-2021, 02:41 PM | #16 | |
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Join Date: May 2010
Location: Jordan, MN
Posts: 1,411
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Re: Model A rearend conversion
Quote:
I have often said over 75mph feels like you have air suspension. With the full fenders, you do! Good Day! |
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01-18-2021, 02:47 PM | #17 |
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Location: New Zealand
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Re: Model A rearend conversion
Our speedster will cruise effortlessly at 70mph with the F150 gearbox and the highest ratio 4th gear, but we only hold this speed on a motorway in light traffic and excellent road surface. Otherwise, it's most comfortable cruising speed is around 55 mph and it's brakes and suspension that dictate that.
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01-19-2021, 11:11 AM | #18 | |
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Location: Durango CO
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Re: Model A rearend conversion
Quote:
Agreed....my point was simply that the engine determined top speed, not the transmission. I'm running a B engine with an original CRAGAR head, hydraulic brakes, F-100 steering box and a host of other go-fast goodies.
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