GU6 is just in indicator of the differential ratio a gu6 is a 3.42:1 ratio. it could be single track, limited slip or gov lock. if it is gov lock you should also have a g80 code in your glove box. if so and you tow or have tall tires be ready to replace when master pin breaks
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It depends on the application. Posi is good for straight track racing, or good traction while off-roading, but wears out tires fast on curves and turns.
A posi was an option so unless it was ordered it will be an open differential, raise the back of the car off the ground, put in neutral and spin one rear wheel forward and if the other one spins also in the same direction at the same time it's a posi rearend.
There are two U-Joints that are easily visible on a rear wheel drive vehicle. The driveshaft on a rear wheel drive vehicle has a U-joint at each end, just forward of the differential (the pumpkin-sized metal assembly on the rear axle) and near the transmission.
i HAVE A 2003 FORD EXPLORER, WITH LESS THAN 15000 MILES THE REAR END STARTED WHINING FOUND OUT FORD HAD A BULLETIN ON IT , THEY REPLACED THE WHOLE REAREND.
Rear end of the engine - front end of the transmission