The Ford Barn

Bob Bidonde · 03-22-2019, 11:37 AM

I need to find out the gear ratios for the "A" 3-speed transmission and the "AA" 4-Speed transmission.

Chris Haynes · 03-22-2019, 11:47 AM

In high gear they are both 1 to 1.

Jim Brierley · 03-22-2019, 12:50 PM

Gear A 29t 28t 26t 25t

1st 3.12 3.11 2.82 2.327 2.12
2nd 1.85 1.77 1.607 1.576 1.44
3rd 1 to1 1 to1 1 to1 1 to 1 1 to1
Chart above shows ratios for passenger cars, Model A, the other numbers are the tooth count on V8 cluster gears. Sorry, the chart didn't transfer as perfectly. Chart is from my 4-banger book.

Brian T · 03-22-2019, 12:54 PM

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Hi Bob,
Here is a post by 1955cj5, a few years back.

Would your truck have had a 3-speed originally?

You do not gain much on ratios...

1st is 6:4 in the 4 speed

2nd is 3:09 in the 4 vs 3:12 in the 3-speed 1st gear

3rd is 1:69 in the 4 vs 1:85 in the 3-speed 2nd gear

high gear, 4th and 3rd respectively are both 1:1

03-22-2019, 11:37 AM	#1
Bob Bidonde Senior Member Join Date: May 2010 Location: Long Island, NY Posts: 3,464	Transmission Gear Ratios I need to find out the gear ratios for the "A" 3-speed transmission and the "AA" 4-Speed transmission. __________________ Bob Bidonde

03-22-2019, 11:47 AM	#2
Chris Haynes Senior Member Join Date: May 2010 Location: Camarillo, CA and Pine Grove, CA Posts: 2,832	Re: Transmission Gear Ratios In high gear they are both 1 to 1. __________________ 1921 Runabout 1930 Tudor Early 1930 AA Speed costs money. How fast do you want to go?

03-22-2019, 12:50 PM	#3
Jim Brierley Senior Member Join Date: Jun 2010 Location: Temecula, CA Posts: 4,085	Re: Transmission Gear Ratios Gear A 29t 28t 26t 25t 1st 3.12 3.11 2.82 2.327 2.12 2nd 1.85 1.77 1.607 1.576 1.44 3rd 1 to1 1 to1 1 to1 1 to 1 1 to1 Chart above shows ratios for passenger cars, Model A, the other numbers are the tooth count on V8 cluster gears. Sorry, the chart didn't transfer as perfectly. Chart is from my 4-banger book.

03-22-2019, 12:54 PM	#4
Brian T Senior Member Join Date: May 2010 Location: San Diego,Ca Posts: 1,377	Re: Transmission Gear Ratios Sponsored Links (Register now to hide all advertisements) Hi Bob, Here is a post by 1955cj5, a few years back. Would your truck have had a 3-speed originally? You do not gain much on ratios... 1st is 6:4 in the 4 speed 2nd is 3:09 in the 4 vs 3:12 in the 3-speed 1st gear 3rd is 1:69 in the 4 vs 1:85 in the 3-speed 2nd gear high gear, 4th and 3rd respectively are both 1:1 __________________ Nothing can be made foolproof, ---- fools are ingenious bastards.