The Ford Barn

Phred · 08-08-2016, 10:29 AM

Les Andrews book shows 2nd gear as: 6.9:1

Is that the effective final drive ratio when run through the standard 3.78 differential?

What is actual tooth count of the second gear set?

Thanks in advance.

1930artdeco · 08-08-2016, 10:47 AM

I think there is a typo somewhere. 6.9 is so high you would be going about 2mph.
Mike

Jim Brierley · 08-08-2016, 10:47 AM

1st gear - 3.12:1; 2nd gear - 1.85:1; high gear 1:1. Multiply that times the rear end ratio to find the final-drive ratio.

Jim/GA · 08-08-2016, 12:16 PM

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Quote:

Originally Posted by Phred

Les Andrews book shows 2nd gear as: 6.9:1

Is that the effective final drive ratio when run through the standard 3.78 differential?

Yes.

1.85 * 3.78 = 6.99

So closer to 7.0, actually.

08-08-2016, 10:29 AM	#1
Phred Senior Member Join Date: May 2010 Location: IL Posts: 303	Transmission Gear ratios Les Andrews book shows 2nd gear as: 6.9:1 Is that the effective final drive ratio when run through the standard 3.78 differential? What is actual tooth count of the second gear set? Thanks in advance.

08-08-2016, 10:47 AM	#2
1930artdeco Senior Member Join Date: May 2010 Location: Lynden, Wa Posts: 3,777	Re: Transmission Gear ratios I think there is a typo somewhere. 6.9 is so high you would be going about 2mph. Mike __________________ 1930 TownSedan (Briggs) 1957 Country Sedan

08-08-2016, 10:47 AM	#3
Jim Brierley Senior Member Join Date: Jun 2010 Location: Temecula, CA Posts: 4,251	Re: Transmission Gear ratios 1st gear - 3.12:1; 2nd gear - 1.85:1; high gear 1:1. Multiply that times the rear end ratio to find the final-drive ratio.