I talked to my friend Keith who owns the transmission shop that was
started by his father in the 40's. Keith says the only planetary set
that is tougher than the Ford E40D, 6-pinion would be the gear sets
from the newer Allison 5 speed, electronically controlled
transmissions. These are the Allison 1000 series transmissions that are
in the GM 2500 and 3500 series trucks with the 6.6L engines.
Keith
specifically mentioned that the older Allison transmissions like the
AT545 that were paired with the 5.9L engines in the 1980's are not in
the same category and he would not use parts from them for our
purposes.
I gleaned some photos of the Allison 1000 planetaries from
this site: http://www.transmissioncenter.net/Allison1000.htm. You can
get an idea of the size of the planet assembly from one of the
pictures. Also, one of the pictures shows a thrust bearing on one of
the planet gears that looks thick enough that it could be a needle
bearing. The planet sets are numbered from the front of the
transmission: P1, P2 and P3.
Aubrey
Wow! Thanks Aubrey. I have been curious about the Allison for years.
Looks like it should handle a 1200 HP turbo 3 rotor no problem.
Paul Lamar ...No rotor no motor.
Today, I got a chance to look at an Allison LCT1000 service technician
training manual. The rearmost planet set, P3, is larger and more
robust than the other two. The transmission output shaft is connected
to the P3 planet carrier. When the transmission is in 1st gear, P3 is
the only active gear set. Input is on the sun gear, the ring gear is
clamped, and the output is from the carrier. The ratio is 3.10:1. This
training manual content is somewhat superficial and the gear set ratios
are not explicitly stated. I haven't yet taken time to figure out the
ratios of the other planet sets. But, I think the P3 set is the best
one for a PSRU. I think you are right, Paul, even using engine oil,
this gear set could safely be used with a 400hp to 600hp 20B.
Aubrey
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