Posi rearends require an additive to be mixed with the gear lube. This is used to mediate friction in the clutch plates. If you've ever forgotten this little 4 ounce bottle when changing out your gear dope, then you know how absolutely necessary this posi additive really is! Rear tires will chirp when going around corrners and strange clunks and noises will come out of the rear of the car. Champion has this limited slip additive that surpasses OE requirements to protect sensitive clutch packs, quiet down your posi unit and offer the best friction protection possible.
| Make | Model | Years |
| Chevrolet | Camaro | 1967 - 1976 |
| Pontiac | Firebird | 1967 - 1971 |
