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Old 01-09-2016, 03:43 PM   #242
wensum
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Join Date: Apr 2011
Location: New Zealand
Posts: 433
Default Re: F150 tranny with overdrive

One needs to be aware that there are three overdrive ratios available with the F150 transmission. Unaware of that fact, I discovered too late that I had installed the highest ratio of 42% (I think that 35% is recommended for Model A's)
Fortunately, with an improved motor and lightweight body it pulls this ratio effortlessly up hill and down dale.
I haven't checked what diff ratio I have but presumed it to be standard, but as it was out of a speedway midget it may indeed be lower than normal.
To complicate the issue I have a vintage quick change diff with a slightly higher ratio.
All I know is that at 100kph (62mph) it is pulling 1670 rpm.
The installation uses a MAC's bell housing and requires a Mustang turbo clutch.
Keith
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