| The very purpose of a differential is to allow each
rear wheel to turn at different speed, such as during cornering. Limited Slip
Differentials, often referred to as Posi (which is a GM trademark name for LSD), are used
to limit wheel spin but still allow the wheels to turn at different speeds during
cornering. |
| Welding a differential will force the wheels to rotate at the
same speed. This is a race trick and has no place on a street car. A car with a welded
differential becomes much harder to control under anything but race conditions, it makes
the car very uncomfortable to drive at slow speeds, and can cause an inexperienced driver
to lose control of the car during cornering. It is not recommended for anything
other than race cars that are never driven on the road. |
| To weld a differential, drain the oil, remove the rear cover
and weld the spider gears. This should only be done with an open (non LSD) unit as
an LSD cluster has no access for welding. |
| Rotate the differential until the spider gears are visible through the
openings and weld the 4 gears together. |
 |
| An example of a welded set of gears. Take care not to allow weld splatter
to damage the splines in the outer gears. |
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