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Old 01-15-2018, 01:14 PM   #1
Don/WI
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Default Why is AA used on engine number

Why do they use the AA on the engine number of 1 ton trucks when the engines are all the same? Don/WI
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Old 01-15-2018, 01:34 PM   #2
SeaSlugs
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Default Re: Why is AA used on engine number

Because they really werent all the same -

AA trucks had a check valve ball setup for the rear main oil return tube so when they were tilted to unload grain all the oil didnt run out.

Also had a slightly heavier clutch and slightly larger clutch to move the 1.5+ tons that could be on it.
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Old 01-15-2018, 02:46 PM   #3
Osage Orange
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Default Re: Why is AA used on engine number

Wasn't there a difference in bell housing, too? I know that H.A.M.B. hotrodders covet that bell housing so that it can accept late model Ford truck transmissions.
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Old 01-15-2018, 04:02 PM   #4
Bob C
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Default Re: Why is AA used on engine number

Quote:
Originally Posted by Osage Orange View Post
Wasn't there a difference in bell housing, too? I know that H.A.M.B. hotrodders covet that bell housing so that it can accept late model Ford truck transmissions.
Yes for very late 1929-31, but it was the clutch springs that determined the engine number prefix.

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Old 01-15-2018, 04:05 PM   #5
john charlton
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Default Re: Why is AA used on engine number

The AA trucks with the 4 speed transmission had the pedal shaft on the transmission case not the bell housing. They were shallower than a regular bell housing so lent themselves to transmission conversion .

John in windy rainy Suffolk County England .
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