Mr Lamar,
I saw in one of the emails that someone (or you) had said that the ford c9 planetary was better than the allison, having better gear set up amd engagement? I'm sorry to bother you about it nit for the life of me I can't find the discussion chain that has it , I read it last night.

Rob Miller.

The Allison  gear is four pinions but they are 1.4 inches wide and the Ford is .9 inches wide.

The ring gear on the Ford is 4.6 inches in diameter and the Allison is 6 inches in diameter.
So line contact length is not much different.t 4 X 1.4 is 5.6 inches for the Allison
and 6 times .9 is 5.4 inches for the Ford. Loads on the Allison teeth are a bit lower
due to the larger diameter.

The Allison however is much heavier but I don't know how much as I never weighed
it cut down. Kevin has a big lathe so maybe he will cut one down and weigh it.
It is too big for my lathe.

They both are about the same reduction Ratio.
The formula is C / A + 1. C is the ID of the ring gear and A is
the diameter of the sun gear.


Paul Lamar

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