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the humming noise you are hearing is the gear inside of the headlight motor. there is a worm the motor turns, you chipped a tooth off of the motor. it won't read that the headlight is down, so it continues to turn until the override shuts it off. its a factory defect. Pontiac used a nylon motor to turn a metal worm. over time the worm wears the gear out. you have three options to fix it. one, replace the motor. two, take the motor out, take it apart rotate the gear inside the motor (only half the gear makes contact with the worm) so the other half of the gear is now used. it should be good for about another year after that. three, take out the motor break it apart and replace the nylon gear with a metal gear. if you take the motor apart, you need to epoxy it back together, the motor is not designed to be worked on. a new gear should cost about 50 dollars. a new motor should cost about 250. but it will have the same nylon gear in it. good luck.
There were Three different Differentials take your Vin number and ask your local dealer. Good Luck and Remember.Change Your Mind, Not Your Oil.Use the First In Synthetic Motor Oil's.See My Bio For more information. Answer There should be a tag on one of the bolts on the rear cover. The gear ration is stamped on it.
Chances are real good you will take out your pinion bearing, pinion gear, carrier bearings, and ring gear in really short time.
purple
85W90 gear oil.
If you have the know how and the correct tools with some modifications you can put any motor you want in any car might have to change some major things like the gear box rear end and have a custom drive shaft made.
Nothing really. But remember that the front and rear ring and pinion MUST be the same gear ratio. You didn't say if the Z71 was a 4-wheel drive. If it is not then you will either kill the engine power are may even increase the power.That depends on the gear ratio in the 3/4 TON rear end and the 1/2 ton rear end. / DIFFERENCE Low gear verses high gear. Low gear= Power. High Gear = No power.
85W90 Gear oil.
Take the rear end plate off and count the pinion gear teeth, write it down. Now count the ring gear teeth, write it down. Then divide the pinion # into the ring gear # and that will be the gear ratio.
Need to remove the rear end plate. Then count the teeth that is on the ring gear ( big gear ) and write it down. Now look up inside of the housing and you will see another smaller gear that runs in the big gear, That will be the pinion gear, count those teeth now. Now take this # and devide it into the first # you wrote down and this will be the gear ratio. You will have to jack it up and take it out of gear, so you can turn the gears to be able to count them.
If you are checking the rear end, there is a bolt on the back side of the pumpkin( facing the rear) Take the bolt out and there should be a thin trickle of gear oil running out. If not, put 80-90 gear oil in until there is a thin trickle running out.
The speed of a semi truck is determined by the powerplant, transmission, and rear end gear ratios. Take three trucks.. let's say, in this case, three Freightliner Classic XLS... they have the same motor, same transmission, but different rear end gear ratios. One truck has 3.36 rear ends, one truck has 3.70 rear ends, and one truck has 4.11 rear ends.. the truck with the 4.11 rear ends would be the slowest of the three, but better suited for particularly heavy loads. The truck with 3.36 rear ends would be the fastest. The fastest truck I've ever driven was a Peterbilt 389 with a Cummins Select 600 horsepower motor, 13 speed Eaton Fuller transmission, and 3.25 rear ends. It was capable of doing over 140 Miles Per Hour.