Differentials

There are three ways to find a gear ratio.

1 A dealer can normally tell from the vin number.

2 There are normally tags or labels on the axle that have part number, gear ratio, and fluid requirement

info.

3 You can count how many times you have to turn the driveshaft to get one complete turn of the tires.

There are four ways to find a ratio.

1 A dealer can normally tell from the vin number.

2 There are normally tags or labels on the axle that have part number, gear ratio, and fluid requirement info.

3 You can count how many times you have to turn the driveshaft to get one complete turn of the tires.

4 You can divide the number of teeth on the ring gear and divide by number of teeth on the pinion.

One key to this design problem is to remember that gears must have a whole number of teeth. It is impossible to roll a gear against another gear that has, say, half, a tooth somewhere among the whole teeth. So gears always have a whole number of teeth.

Another key is that the gear ratio is the ratio of the numbers of teeth on two gears, N1 divided by N2. The result of this division often produces a fraction AND the fraction is often ROUNDED OFF in printed materials. Because of this round-off, you cannot be certain what the actual fraction is. This means that, even when you find whole-number values for N1 and N2, you cannot be certain that they represent the exact numbers.

So, here is how to find the pair of gears from a given gear ratio such as 4.11. First, examine the fraction, 0.11, from the ratio. Find a whole number m such that m times the fractional part of the gear ratio gives another whole number almost exactly? Try m = 2, 3, 4 ... up to 16 or even more until you find a good fit.

For the given problem, 9 x 0.11 = 0.99, which is almost 1.

That whole number m is the SMALLEST possible number of teeth for one gear.

Multiply the gear ratio by m and round to a whole number to get the least number of teeth on the second gear. So, 9 teeth is the smallest number of teeth for one gear and 9 x 4.11 = 36.99 (that is, 37) is the smallest number of teeth for the other gear.

You can multiply the number of teeth on both gears by any whole number without changing the gear ratio. So, 2 x 9 = 18 teeth and 2 x 37 = 74 teeth also have the ratio 37 / 9 = 4.11111...

Here is how to tweak the result if the fraction you chose didn't give a satisfactory result:

Multiply the number of teeth from the trial answer by any whole number, say 2 or 20.

20 x 9 = 180 and 20 x 37 = 740

Now subtract 1 from the number of teeth on the larger gear and calculate the gear ratio.

740 - 1 = 739 and 739 / 180 = 4.105555...

Alternatively, add a tooth to the larger gear and check that ratio: 741 / 180 = 4.116666...

One key to this design problem is to remember that gears must have a whole number of teeth. It is impossible to roll a gear against another gear that has, say, half, a tooth somewhere among the whole teeth. So gears always have a whole number of teeth.

Another key is that the gear ratio is the ratio of the numbers of teeth on two gears, N1 divided by N2. The result of this division often produces a fraction AND the fraction is often ROUNDED OFF in printed materials. Because of this round-off, you cannot be certain what the actual fraction is. This means that, even when you find whole-number values for N1 and N2, you cannot be certain that they represent the exact numbers.

So, here is how to find the pair of gears from a given gear ratio such as 4.11. First, examine the fraction, 0.11, from the ratio. Find a whole number m such that m times the fractional part of the gear ratio gives another whole number almost exactly? Try m = 2, 3, 4 ... up to 16 or even more until you find a good fit.

For the given problem, 9 x 0.11 = 0.99, which is almost 1.

That whole number m is the SMALLEST possible number of teeth for one gear.

Multiply the gear ratio by m and round to a whole number to get the least number of teeth on the second gear. So, 9 teeth is the smallest number of teeth for one gear and 9 x 4.11 = 36.99 (that is, 37) is the smallest number of teeth for the other gear.

You can multiply the number of teeth on both gears by any whole number without changing the gear ratio. So, 2 x 9 = 18 teeth and 2 x 37 = 74 teeth also have the ratio 37 / 9 = 4.11111...

Here is how to tweak the result if the fraction you chose didn't give a satisfactory result:

Multiply the number of teeth from the trial answer by any whole number, say 2 or 20.

20 x 9 = 180 and 20 x 37 = 740

Now subtract 1 from the number of teeth on the larger gear and calculate the gear ratio.

740 - 1 = 739 and 739 / 180 = 4.105555...

Alternatively, add a tooth to the larger gear and check that ratio: 741 / 180 = 4.116666...

41 and 11

Depends on needs. Fuel mileage, power, etc.....

There are three ways to find a gear ratio.

1 A dealer can normally tell from the vin number.

2 There are normally tags or labels on the axle that have part number, gear ratio, and fluid requirement

info.

3 You can count how many times you have to turn the driveshaft to get one complete turn of the tires.

Sterling 10.25

77ft lbs

you could try and check the transmission fluid because when mine ran out it was just spining not moving if this helps thanks man :)

Go to the following link, it has diagrams of about every BMW assembly there is http://www.bmw-z1.com/z1/etk/en/24966_33f.html

I am replacing a wheel bearing on my 1993 G20 Beauville, so had to answer this. Depends on whether you have a full floating or semi-floating axle setup. Most Chev 3/4 ton (G20) will have the semi-floating axle. You can identify this at the wheel because you will see only the 5 wheel nuts. This type has a C-clip at the end of the axle in the differential so you will need to remove the differential back cover, then remove the pinion lock screw and pinion gear shaft. Push the axle inwards(probably need a helper) and the C-clip will appear, ready to remove and release the axle. I think it is a little harder to locate the C-clips if you have a locking type differential but they are in there. Full floating is more heavy-duty and you will know it by the 8 bolts inside the ring of wheel nuts on a projecting hub at the center of the wheel. No C-clip for this axle type. I think you just need to take the 8 bolts off and free the hub flange to remove the axle.

Valvoline recomends 15,000-30,000 depending on how hard the vehicle is used...I do mine about every 30,000

89

on a thin metal tag that is held in place by one of the differential bolts around what we call the pumpkin. Sometimes when the plate on the pumpkin is removed, the thin metal tag is lost or broken.

Remove the fill plug, pump or squease in lube until fluid comes out of fill plug hole, replace fill plug.

There are three ways to find a gear ratio.

1 A dealer can normally tell from the vin number.

2 There are normally tags or labels on the axle that have part number, gear ratio, and fluid requirement

info.

3 You can count how many times you have to turn the driveshaft to get one complete turn of the tires.

when you take the car out of drive and put in park the drive mechanism or transmission does not put as much load on the engine so it runs faster.

Yes, there are some special considerations. You'll need to get the right combination of ring gear and pinion gear plus you'll need to align it properly, otherwise they will not last very long and will make a terrible noise. You may need to go to a shop that specializes in differentials. While it isn't rocket science, it does require some attention to detail.

The differential is an assembly of gears located between the drive axles. It's purpose is to allow the drive wheels to move at different speeds while maintaining power to both. This lessens tire wear and improves handling.

Up to 2002, 80w90

2003 and later 75w90 synthetic

in Ebay ie really easy, you find anything you looking for Also, about the best supplier of info I've found is transtarindustries.com. If it's an automatic, it is most likely the 700r-4, which is a very good tranny. They have all the data + parts lists in pdf format for just about any tranny you can imagine.

If your car/truck is having problems shifting, it may be your transmition. You may want to get that checked out.

Just remove the 2 straps on back u-joint & pull out of trans tailshaft. Mark first, since some balanced & torque only to spec when reinstall. Torque on nuts surprisingly low.

The options for a 1500 are 3.21, 3.55, and 3.92:1.

The options for 2500 and 3500 are 3.42, 3.73, 3.83, and 4.10:1.

The 4500,5500 options are 4.10, 4.44, and 4.88:1.

There is no concrete answer. Different vehicles have different needs. For instance, an off-road vehicle may need a differential fluid change as often as every 30,000 miles. A vehicle used for everyday travel may never need a differential fluid change. Some manufactures consider the differential lubed for life and others recommend that it be changed at a set mileage like 100,000 miles. Refer to your owner's manual for when or if yours should be changed.