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30 • FIESTA ST RALLY VXL
advanced tuning adjustments
Rear differential:
1. Remove the two 3x20mm button-head screws that secure the
top bumper mount to the differential case.
2. Turn the chassis over and remove the two 3x12mm countersunk
screws that hold the bumper/skid plate to the bulkhead.
3. Remove the 3x20mm button-head screw from the bumper
mount and tie bar.
4. Slide the bumper assembly off of the chassis.
5. Remove the tie bar from the chassis.
6. Remove the two 3x15mm button-head screws from the differential
cover. DO NOT remove the two screws that secure the shock tower.
7. Use a 1.5mm hex wrench to remove the two screw pins that hold
the drive cups to the differential output shafts.
8. Remove the differential cover and slide the differential out of the
front of the case.
9. To reinstall the differential, reverse the steps.
Rear Differential Removal
1.
3x20 BCS
6.
3x15 BCS
3.
3x20 BCS
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Refilling the differential:
1. Remove the four 2.5x8mm screws from the differential case and
carefully pull the differential case halves apart. Work over a towel
to collect any fluid that drips from the differential.
2. Drain the fluid from the differential. You may wish to remove the
spider gears from the differential to make this easier.
3. Place the spider gears back into the differential case, if you
removed them. Fill the differential case with fluid until it the
spider gears are submerged half way.
4. Rejoin the differential case halves, using care to align the screw
holes. Be sure the rubber gasket is in place or the differential may
leak.
5. Install the 2.5x10mm screws and tighten securely.
7.
2.
3x12 BCS
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