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Preparing the Vehicle for Installation
Take the following steps to prepare your vehicle for installation:
• Block the vehicle’s tires, and place the transmission in neutral.
• Loosen the lug nuts and jack the vehicle up.
• Make sure that the vehicle is securely resting on jack stands.
• Remove the wheels; disconnect the brake lines and emergency brake cables,
if needed.
• Slide out both axles to provide enough clearance to remove the dropout.
• Remove the dropout from the axle housing.
Carrier Removal and Teardown
• Using a punch, mark one of the bearing caps so you can remember which side
it belongs to. Bearing caps are specific to each side of the housing. This is very
important for re-assembly.
• Check your backlash with a dial indicator and make note of it. You will need
to check it again later after re-assembly to make sure everything went back
together properly.
• Remove bearing caps, and pull out carrier.
• Make note of the bearing races as they will need to be reinstalled on the
same side they came off of.
• Remove roll pins and separate the carrier.
• Remove cross pin shaft, spider gears and thrust washers.
• Clean carrier case and side gears thoroughly.
• Inspect carrier case and side gears for excessive wear. If the carrier or side
gears are damaged or worn excessively, your Spartan Locker may not work
properly or could be damaged.
Installation Steps for 4 Pinion Ford 9” Rear Axles:
• Place springs into the alignment pins. Figure 1-D
• Carefully install the alignment pins and springs into the holes in the back of
the drivers. Make sure the springs do not fall out or become wedged side-
ways in the holes during installation. Figure 2-D
• Install the first side gear into the carrier case, without the thrust washer. Figure 3-D
• Place first driver onto side gear. Figure 4-D
• Install center block. Figure 5-D
• Take note of roll pin holes in case
• Install large cross pin lining up hole in pin with hole in case. Figure 6-D
• Install small cross pins aligning hole in pins with holes in case. Figure 7-D
• Place the second driver on top of the cross. The alignment pins in each driver
must fall into the slots of the opposing driver. Figure 8-D
• Install the second side gear on top of the driver, without the thrust washer.
Figure 9-D
• Place top carrier half onto carrier assembly. Figure 10-D
Figure 1-D
Figure 3-D
Figure 5-D
Figure 7-D
Figure 2-D
Figure 4-D
Figure 6-D
Figure 8-D
