4201 - Diff Ring
1387 - 1/4” x 3/8”
Plain Bearing
Lip
4121 - Diff Spacer
4123 -
Spring Washer
4126 -
Nylon Diff Nut
4732 - 1/4” Shim
1-INSTALL AND GREASE THE DIFF BALLS
Place the spur gear flat on the table in front of you with the side that says “CRC”
facing down. The diff balls will fall into each of the outer ring of holes in the diff
gear, but won’t fall out the other side. Place a small dab of silicone diff grease on
each ball to lube the ball and prevent the balls from falling back out of the holes
during assembly. Use very little!
*(Holding the car on it’s side, with the rear axle pointing upright will ease assembly
of the diff.) Place 1 diff ring, and then a 1/4” x 3/8” plain bearing over the end of
the axle. Align the diff ring so that it notches into the axle flange. Place the
assembled gear with the greased diff balls over the axle and push it down over the
plain bearing. Next, insert the other plain bearing into the back of the diff hub.
Then, align the second diff ring with the notch on the back of the diff hub. *(place a
small dab of the diff grease on the hub first to hold the ring in place.)* Now, slide
the hub, bearing, & diff ring down over the axle. Next, slide a flanged bearing over
the axle and into the front of the diff hub.
2-DIFF ASSEMBLY
Small lip
toward bearing
1
** Balls in outer ring of holes in gear **
1386 - 1/4” x 3/8”
Flanged Bearing
DIFF ASSEMBLY - CONTINUED...
The diff spacer has a small machined lip on one
side, point that lip toward the bearing. Now,
place the spring washer so that the cone points
away from the gear. The outside of the washer
should be against the diff spacer, and the inside
of the washer should be against the diff nut,
which now goes on last. *Be sure the 2 “D” rings
have settled into their notches. Just snug the nut
so the parts stay together on the diff axle.
DON’T over-tighten so the outer diff hub bearing
gets crushed! Correct diff tension needs to be
set with tires on the car.
1376 - 4-40 x 3/8”
Steel Socket Cap
10
3 - Setting the Diff
Once the tires are on: Adjust the diff nut so that the tires spin back and forth freely when holding the
spur gear, but it is very difficult to slip the spur gear with your thumb when holding both tires. Again -
DON’T over-tighten so the outer diff hub bearing gets crushed! Re-check diff tension after the first run.
Bag 8
Differential Axle
Bag 9
Differential
1728
1933
*NOTE - THE 1/4” SHIMS ARE FOR FINE TUNING THE WIDTH OF
THE REAR END
.THEY ARE NOT NECESSARY LIKE THE TWO RED
SPACERS SHOWN IN THE DIAGRAM BELOW
.
4720 - Axle Spacer-
Xti-2 + 5mm
64072
64080
64088
64096
1228
1925
Dot of
grease
1728 - 1/10 Graphite Axle
1933 - Narrow Left Clamp Hub
1925 - Long Diff Hub
1228 - 3/32 Diff Balls (100)
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