FX4 rear end questions
#1
FX4 rear end questions
Level II.
I know it has the stronger axles and supposedly some sort of locking or limited slip rear.
Correct?
I took off kind of fast in the rain and it seemed to spin 1 wheel.
How can I tell if it is working correctly?
What does it take to repair if it isn't?
Is it worth it?
I know it has the stronger axles and supposedly some sort of locking or limited slip rear.
Correct?
I took off kind of fast in the rain and it seemed to spin 1 wheel.
How can I tell if it is working correctly?
What does it take to repair if it isn't?
Is it worth it?
#2
#4
The Level II uses a rear Torsen limited slip differental. It is gear driven and does not suffer from the decrease in performance like the cluch pack / stock l/s does. It is still posible to spin one wheel with a limited slip.
Reading
http://www.torsen.com/products/products.htm
http://www.sonic.net/garyg/zonc/Tech...ferential.html
Reading
http://www.torsen.com/products/products.htm
http://www.sonic.net/garyg/zonc/Tech...ferential.html
#7
Originally Posted by LILBLUE04FX4L2
5SPD LII had some problems and there was a 'soft' recall
yours might not have been serviced
I would check FORD records for your vin # and see if it had a retrofit
yours might not have been serviced
I would check FORD records for your vin # and see if it had a retrofit
It is possible to spin one tire with a Torsen. It is a limited slip, not a locker.
#9
For a limited slip, one wheel has to start slipping before the L/S will engage and transfer torque. This is especially apparent in the Torsen unit because it multiplies torque. If, for example, one of your wheels were in the air, you'd have 0 torque there and no torque could be transferred to the other wheel, because anything times 0 is still 0. That's about the only situation where some of the other l/s units are better.
Check out www.howstuffworks.com and find their article on differentials. They have a VERY thorough explanation of how all different kinds of diffs work. Very cool stuff.
Check out www.howstuffworks.com and find their article on differentials. They have a VERY thorough explanation of how all different kinds of diffs work. Very cool stuff.
#18
#19
Originally Posted by Dadinator
How can I tell if it is working correctly?
Jack up the left rear tire so that it's off the ground.
Take a torque wrench and measure what torque it takes to turn the raised wheel by using one of the lugs nuts. (make sure your not torqing accross the axle center line. Put the wrench on the furthest most rearward nut and push down)
This is the method to properly inspect a LS diff. Once you have that torque reading go compair it to what the spec should be and you'll know if it's still good or not. (not sure where to get the spec for a ranger.. but someone around here has to have a Ford manual)
For reference a 9.75 ford diff measures between 25ft lbs and 35ft lbs.
Rich
#20
Or you can do what someone else already said thats MUCH easier than any other method but will give you decidely UN-scientific results.
Park your vehicle in some relatively loose material, grass, dirt, stones, whatever. Hammer the gas for just a few seconds and then STOP, see you left TWO nice tire/burnout marks.
If you DIDN'T then yes, your L/S is not functioning as it should. It will however not always engage on slippery surfaces, especially if your turning because the WHOLE point of an L/S is drivability as opposed to TOTAL traction.
Park your vehicle in some relatively loose material, grass, dirt, stones, whatever. Hammer the gas for just a few seconds and then STOP, see you left TWO nice tire/burnout marks.
If you DIDN'T then yes, your L/S is not functioning as it should. It will however not always engage on slippery surfaces, especially if your turning because the WHOLE point of an L/S is drivability as opposed to TOTAL traction.
#21
Not a valid test, unfortunately. Even an open rear can spin both tires in that situation. You can't tell from that UNLESS you leave a single "dig".
In other words, it may prove you have an open, but it does NOT prove you have a limited slip, or that you don't have an open. It's not a definitive test.
In other words, it may prove you have an open, but it does NOT prove you have a limited slip, or that you don't have an open. It's not a definitive test.
#22
Originally Posted by n3elz
Not a valid test, unfortunately. Even an open rear can spin both tires in that situation. You can't tell from that UNLESS you leave a single "dig".
In other words, it may prove you have an open, but it does NOT prove you have a limited slip, or that you don't have an open. It's not a definitive test.
In other words, it may prove you have an open, but it does NOT prove you have a limited slip, or that you don't have an open. It's not a definitive test.
#23
Jacking up the rear end after blocking the front wheels, putting the vehicle in neutral, and rotating the tires as indicated previously. A totally open rear will allow you to FREELY rotate a tire and you will observer the tire on the other end spinning in the opposite direction. The driveshaft, interestingly enough, may not turn at all.
On a limited slip vehicle where there is always some bias, the tire will be harder to turn (typically) and the other tire will spin in the same direction, and the driveshaft will move.
That's about all you can do. An open differential provides a "zero sum" division of torque to the two wheels. That is, the driveshaft total input is split between the two wheels such that the sum equals the input power (minus friction and other losses).
This means that they can have equal torque, or any split from one wheel getting it all to anything in between. This is why the "slippery ground" test doesn't tell the story necessarily. Many people think an open diff always means only one wheel gets the power, but it simply is not the case.
What's the BEST test: taking the diff cover off and looking at what's in there, lol...
On a limited slip vehicle where there is always some bias, the tire will be harder to turn (typically) and the other tire will spin in the same direction, and the driveshaft will move.
That's about all you can do. An open differential provides a "zero sum" division of torque to the two wheels. That is, the driveshaft total input is split between the two wheels such that the sum equals the input power (minus friction and other losses).
This means that they can have equal torque, or any split from one wheel getting it all to anything in between. This is why the "slippery ground" test doesn't tell the story necessarily. Many people think an open diff always means only one wheel gets the power, but it simply is not the case.
What's the BEST test: taking the diff cover off and looking at what's in there, lol...
#24