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It is not reccomended.  Gear sets are lapped at the factory and become a matched set. Attempting to run two different gears together may result in gear noise and possible failure.

Never re-use crush sleeves. Once the crush sleeve' has been used it can not be used again. This is also true if a crush sleeve is over-crushed during installation. It must be discarded and replaced with a new one. Superior offers install kits that include new crush sleeves to make your install flawless.

A  posi, will only provide a portion of torque transfer from the slipping wheel to the wheel with good grip. A locker will completely lock up and transfer 100% of torque to both wheels.  As a general rule, a positraction is better for on road daily driving while a locker is a better choice for offroad use when mobility is necessary.

Here's 4 Reasons To Change Your Gear Ratio.

If you have larger than stock tires on your vehicle, the benefits of gearing CANNOT BE MATCHED BY ANY OTHER MODIFICATION TO THE VEHICLE!

By regearing it is guaranteed that:

1. TORQUE TO THE REAR AXLE WILL BE GREATLY IMPROVED
Even a simple change from a 31" diameter tire to a 33" diameter tire will affect the amount of available torque by 10%.

2. STRESS TO THE DRIVELINE WILL BE GREATLY LESSENED
Modern day transmissions cost $600 or more to perform a basic overhaul. Driving with even a 10% larger tire will result in the transmission being under the same load as always being driven on an incline. The transmission may not suddenly fail, but the life will definitely be reduced by thousands of miles.

3. ENGINE EFFICIENCY WILL BE REGAINED RPM
alone does not affect fuel mileage. An undergeared vehicle (as the result of oversized tires) will result in a substantial loss of fuel mileage. Also, just as with the transmission, your engine life will greatly be reduced.

4. SPEEDOMETER/ODOMETER ACCURACY WILL BE REGAINED
With kits in the $100+ range to calibrate speedometers after tire swaps, it seems pretty important to have an accurate speedometer, which can also be fixed with a simple gear change.

Don't put a bandage on a serious problem. By installing the proper gear ratio, easily determined with our gear calculators, you can save thousands of dollars and days of vehicle downtime, plus have a little fun to boot.

Differential Gear Ratio determines the number of times the drive shaft (or pinion) will rotate for each turn of the wheels (or ring gear). So if you have a 3.73:1 gear ratio the drive shaft turns 3.73 times for every turn of the wheel.

Gear ratio is calculated by dividing the number of teeth on the ring gear by the number of teeth on the pinion gear. The higher the number, the lower the ratio: a 5.29 gear has a lower ratio than a 4.10 gear. With a lower gear ratio the drive shaft (and thus the engine) turns more for each revolution of the wheel, delivering more power and torque to the wheel for any given speed. Lower ratios are generally desirable when going off-road. Higher ratios are better for freeway driving since they run at lower RPM’s and offer better fuel economy.

Changing tire size affects the final drive ratio. Switching from a 30" tire to a 35" tire changes the final drive ratio by about 17%. This may drop the engine out of its' "power band" and result in poor performance and fuel economy. To restore performance you must change the gear ratio to compensate for the change in tire size. If you originally had 3.07 gears you need a ratio that is approximately 17% lower, such as 3.55. If you want to increase off road performance you might want a 4.10 or lower ratio.

Whirring noise only while decelerating at any or all speeds is most likely caused by bad pinion bearings or loose pinion bearing preload, and almost never by bad ring and pinion gears.

A howl or whine during acceleration over a small or large speed range is usually caused by worn ring and pinion gears or improper gear set up.

Rumbling or whirring at speeds over about 20 mph can be caused by worn carrier bearings. The noise may change while turning.

Regular clunking every few feet may indicate broken ring or pinion gears.

Banging or clunking only on corners can be caused by broken spider gears, lack of sufficient positraction lubrication, or worn positraction clutches.

Rumble while turning may indicate bad wheel bearings.

A steady vibration that increases with the vehicle’s speed can be caused by worn u-joints or an out of balance driveshaft.

Clunking only when starting to move or getting on and off the gas might be loose yokes, bad u-joints or worn transfer case or transmission parts.

Posi, is short for Positraction which is the brand name GM gave the limited slip differential when they first offered the option on muscle cars. Today the terms are used interchangably. A Posi is a limited slip differential (LSD).

Superior Axle and Gear includes the full circle clips in all of its axle kits for a reason. The full circle clip more evenly distributes the load and reduces deflection. Often times the smaller C-clips will actually move with the u-joint and can work themselves out causing damage to the ears of the axle shaft. Superior STRONGLY recommends that you use the provided full circle clips with front axle shafts.