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products
JB
Conversions Dana 300 Rotation Plate
Some information by
JB Conversions
The purpose of the new clocking ring
offered by JB Conversions, Inc. is to allow the Dana 300 to
be rotated into positions more conducive to the use of flat
skid plates, multilink suspensions, etc. There are a few
"clocking rings" available through various aftermarket
sources which accommodate this task. We have designed what
we consider to be the best kit on the market. The following
summary illustrates some of the highlights of our design.
Once installed, the new face plate
offers a clean appearance with a varying degree of clocking
points positioned at 7.5 degree intervals. You will also
notice a new input gear extending forward with an internal
spline. The standard spline for Jeep transmission
applications is 23. We can accommodate GM spline counts with
the optional input gear combinations for use with the
clocking plate.
KIT COMPONENTS
The bill of material for the complete
kit includes the new billet clocking plate, 6 allen cap
screws, extended length input gear and 6 new "interference
fit" studs.
The purpose of
the new clocking ring offered by JB Conversions, Inc. is to
allow the Dana 300 to be rotated into positions more
conducive to the use of flat skid plates, multilink
suspensions, etc. There are a few "clocking rings" available
through various aftermarket sources which accommodate this
task. We have designed what we consider to be the best kit
on the market. The following summary illustrates some of the
highlights of our design.
Once installed, the new face plate offers a clean appearance
with a varying degree of clocking points positioned at 7.5
degree intervals. You will also notice a new input gear
extending forward with an internal spline. The standard
spline for Jeep transmission applications is 23. We can
accommodate GM spline counts with the optional input gear
combinations for use with the clocking plate.
KIT COMPONENTS
New billet clocking plate, 6 allen cap screws, extended
length input gear and 6 new "interference fit" studs.
kit contents
The 6 new studs included in the kit are made
with a special interference fit thus allowing the nut to be
easily removed during transfer case removal without the stud
backing out first.
DESIGN
ADVANTAGES
The design we have chosen to produce is one that retains
maximum strength by incorporating the bearing retainer into
the design of the clocking plate. During installation of the
kit, the stock Dana retainer is eliminated. With this
feature, our clocking plate retains a thick cross-section
throughout the indexing area of the piece. This allows us to
manufacture the plate from billet aluminum. An early design
idea was to use a "ring" as shown in the comparison photo
below however the ring design did not yield the thick
cross-section desired.
The new input gear undergoes a
precision grinding process over an extended length beyond
the stock specification. This allows the use of a
conventional oil seal and also the original open ball
bearing resulting in superior lubrication.
The new input
gear is also longer than stock. This allows tranny-to-transfer
case spline engagement specifications to remain intact
eliminating any chance of twisting the transmission shaft
spline due to poor engagement.
One method we have seen for rotating the Dana 300 is to
drill a new hole rotation into the face of the Dana 300
case. The following photo reveals the internal casting
shape, which allows for a casting "boss" where each stock
bolt hole is located. The thicker material created by these
boss areas is key to supplying the thread strength required
to make a strong anchor point for the mounting bolts. When
additional holes are drilled into the case, the new hole
locations do not provide this thicker material therefore a
weaker thread engagement is created. We do not recommend
redrilling the stock case for purposes of rotating the case.
Contact
JB Conversions
for more information |
