Isuzu SUV Forum banner
1 - 1 of 1 Posts

555 Posts
-88- said:
Sags said:
Yea, you shouldn't do that again. It's bad for your truck, and dangerous too.

The binding your talking about comes from the fact that there is no central differential, like in all-wheel-drive vehicles.

When you're in 4wd (doesn't matter high or low, all that is is a gearing change) both the front and rear diff are driven at the same speed through the transmission/transfer case. But when you go around sharp corners your front wheels actually need to travel farther, but since in 4wd they are locked to the same RPM as the rear this caused the binding your talking about. This is why if you read the owners manual in any 4wd vehicle it will tell you not to run 4wd on dry asphalt or any other high traction surfaces, it can lead to dangerous understeer, and damage driveline components too.
I think you mean to say....The outside two wheels need to travel further, while the inside wheels need to travel a shorter distance....Meaning left or right side have to spin at different speeds. LSD was created for this reason, providing a better all around axle. One tire typically receives the power all time allowing the other to free spin according to the road. Until the "powered" wheel looses traction and clutches, springs, and etc...go into play spreading the power between the two wheels....Least this is how I under stand turning, and LSD's...I don't think turns typically affect wheel speed front to back, just side to side.
Thats not quite right either. The part about the inside and outside having to spin at different rates is 100% spot on. The way the LIMITED slip differential works,at least the way OUR LSD works,becuase its a clutch type is that the clutches keep the axle locked normally. One wheel does not spin freely normally,the differential is locked by the clutches normally. When you go around a corner when the is enough torque on the clutch it slips allowing one side to turn at a different rate and it acts like a normal open differential. There are other kinds of limited slip differentials too. Some use fluids and some use gears.

The terms you will see describing the rear end are an "open differential" which is what most cars have,a LSD or Limited Slip Differential, and a "Spool" which means theres just a solid axle between the two wheels and they can never spin at different speeds. (very bad for turning,especially if your wheels cant slip). Here is how an open differential works. Its pretty much the best explanation ive ever seen of it.

1 - 1 of 1 Posts