I recently posted a note here about the Ford E40D planetary gearset that I saw recently. I went back to measure it and the tranny guy said that it fits right in place of the c-6 gearset. The differences are that it has six planetary gears, a steel carrier and a 2.75 to 1 ratio. It would be a choice for someone who wants to run at 8000 rpm for a time to climb record, or if that slower speed prop that is supposed to be developed for the TCM/NASA diesel ever becomes available, it might be possible to use with a rotary and this gearset.
5775 engine rpm for 2100 at the prop.
Brian Trubee
Redmond, WA

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