TCRD=Transfer Case Reduction Drive


    We finally managed to disassemble the np241J, 52853-400AC,
09-06-07-J1, 2.72 transfer case which at weigh-in time weighed 80 pounds
and when reduced to usable parts weighed 25# less the case, prop hub,
and outer gear reduction ring.

    Primary initial hope for the all up weight is 40# which appears to
be within striking distance.

    At the present time we will use the automatic transmission bell
housing as mounted on an Rx8 engine which benefits from a very light
weight of magnesium, a standard starter which mounts such as the
advantage of shifting the C/G positively in both a pusher or tractor
configuration, and reduces liability when the TCRD Kit is sold in parts
and personally certified by the builder as airworthy.

    We will use a 4:1 gear set sold separately, but have been unable to
confirm that the driveshaft splines will fit one of the 4:1 input gear
with 5/6 pinion gears.

    If anyone has knowledge, or where to get the information of a
combination please give us a shout.

     Milo Burroughs

Please excuse me, as there has been talk about the TCRD in the past
year, we have access to cheap 3.10 to 1 gear sets,
from GM and Ford, so I am not  following here !. Where is the 4 to 1
gear set in this case? I think most of these parts
are acquired as is, and without other parts used to make a complete
PSRU, assembled, where does liability come into play ?

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So by using the E4OD rear planetary set, and driving it differently than stock,we get 3.17-1 which specs gave 2.71-1 ratio, what would we get from the Allison 1000/GM which has a spec at 3.10-1.
That sounds confusing, and maybe without  the Allison parts to play with, we wont know. Any idea's ?

Steve Carlisle

The same. It all depends on what part you choose to attach  the prop shaft to.

Paul Lamar

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