Another Ford planetary based PSRU

   Thank Georges

   I probably had brain fade and it is actually the 1.85 that Ross

offered.

  I was just talking to a friend that works on transmissions and he
said that the 78 x 42 gear set came from the E40D transmission so
they are not interchangeable.

  Ken

Ken,
Your friend is correct, it does come from the E4OD transmission, 89 -97, 7
litre Pick-up truck.
So too does the 2.17 - both have 6 planets on the planetary.
Earlier versions have 3 and 4 planets, they have the same ratios.
I will see if I can find a photo to send you of all of the components - this
always helps to understand the ford set-up.
OK.
George


Ken - for your info!

Paul you might want to keep this for further reference.

 Found this- 15 is the 2.85 ratio,

You need 15, 9651, 3887, Plus the ring gear similar to 905, 115, 5488,

(but for the front, not shown in this photo!!).

40 through 2279  is the rear 2.17 ratio,
Having 78 would give you the play needed for mounting 40, in the housing.

That's what Luke sent me some time ago -OK!
George


Here is another picture showing the difference between the
2.85 and the 2.17. The 2.85 is the larger pinion. If you rearrange
the 2.17 gear set you get 3.17 by holding the ring gear and take
power out of the planet carrier. I don't know why anybody with
a rotary would want to use the 1.85 version.

BTW IMHO the best way to hold the ring gear is use six drilled head 
hex bolt set screws in groups of two equally spaced around the outer 
housing and safety wire them.

Paul Lamar
 
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