Differential Building

Here is how TeamCRC Drivers build there differentials.

Lets start fresh to show the true potential of a great diff…

*** 3 new CRC 1/4 x 3/8 flanged bearings (must be CRC bearings, try others back to back, you will see why)

*** 2 new CRC 1/4 x 3/8 flanged bearings (again, use ours)

*** 2 new Large “D” rings (ours, IRS, Associated)

*** 1 pack of our cheap 1/8″ diff balls (we have a good deal on a bag of 100)

*** 1 new spur gear (our gear is better for a free diff and stock racing, Kimbrough is better for mod racing, slightly less free)

Use the left wheel hub/wheel combination as a holder for the assembly. Put the axle in the left diff hub with the “D” ring seat face up. Place 1 new D ring on the seat and set it in the machined pocket.

Load the outer ring of holes with the 1/8″ balls. Pop them in. Place 1 small “dot” of white Associated diff lube (NOT STEALTH!) on each ball. Just a little dab while do. Now, put a new unflanged bearing in the inner and a new flanged bearing in the outer part of the diff hub. Use another couple of dabs of diff grease to hold the D ring to the diff hub as you put it on the assembly. Slide the diff hub/ring on, making sure the ring stays seated in its machined area on the hub.

Now, put a small shim over the axle. Then the aluminum spacer/collar. Then the spring washer with the cone pointing out (or at you). Then the lock nut.

Tighten the lock nut SLOWLY… especially as the assembly begins to tighten and the rings are being pressed to the diff balls. Overtightening here will ruin the outer bearing in the hub. As you tighten the diff nut, check it by holding the left wheel in your left hand, hold the right wheel in your right hand. Push the gear with your right thumb, if it “slips” it’s too loose.

Once it’s tightened to the point of no slipping (AND NO FURTHER), install the axle in the car and apply 2 volts to the motor. Hold the left wheel for a minute or so, then release and hold the right wheel as the motors spins and the diff breaks in.

Check to see if you can now slip the spur gear with your right thumb and tighten until you you can not do so (And NO FURTHER). Now your diff is ready to use and should last for a number of race meetings.

Good luck.

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