See pg 27 of the Instruction Manual on 4wdrc.com tech page. Are you referring to the white slipper pucks shown in D6, or the tiny spacers in D8?
If the white pucks (D6), you absolutely need them all. If either your pucks are worn or your slipper plates scored, replace both. Make sure your Nylock nut is good and not backing off, and make sure the threads on your slipper shaft are good.
If the tiny spacers (D8), use the correct size and number to set end float correctly, and the car functions normally with any number of them. Having just one is not abnormal.
The X - 5 was designed in 2004 and we did all our testing with 11X2s and 3300s. Now with 5.5 and 4600s we're delivering far more torque. The X - 5 will handle it perfectly and go like a rocket when both belt tension and slipper are adjusted correctly. They must be done in tandem. You've got to put it on the track for a lap, then adjust one or the other, then another lap, more adjusting, keep at it until you've got it just right.
Once it's good, it will stay that way for a long time. Ballistic too...
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