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kenparker · 08-01-2012, 07:19 PM

I have been building thes F150 transmiissions for Model A Fords since 1998. I know these gear sets too. Al has the information right on the way to figure the OD %. Subtracting the .70 or .72 or .78 from 100 does not give a true OD %. Subrtacting onlly gives one a numerical figure not a %.

BTW I do not recommend the 41% for the Model A. The 37% only in very special conditions. I drive a 31 Model A coupe with the 27% and a 31 S/W Fordor with a 27% as well as a speedster with the same tranny. I love the combo in all three cars.

08-01-2012, 07:19 PM	#174
kenparker Senior Member Join Date: May 2010 Location: Van, Texas Posts: 1,122	Re: F150 tranny with overdrive I have been building thes F150 transmiissions for Model A Fords since 1998. I know these gear sets too. Al has the information right on the way to figure the OD %. Subtracting the .70 or .72 or .78 from 100 does not give a true OD %. Subrtacting onlly gives one a numerical figure not a %. BTW I do not recommend the 41% for the Model A. The 37% only in very special conditions. I drive a 31 Model A coupe with the 27% and a 31 S/W Fordor with a 27% as well as a speedster with the same tranny. I love the combo in all three cars.