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I have a 2000 expedition awd, i have new tires at all the same pressure. I have replaced the rear diff oil and used the friction modifier as i have the limited slip. Around turns it shudders a bit even 1000 miles after the fluid swap. When the running gear is warmer it is more pronounced.
is there a 4wd actuator in the front diff and if so, how do i test it?
is it possible that the tcase needs a fluid swap?
could the abs sensors be causing it?
it has 158k, throws no codes and there are no stored codes. I bought it like this at 156k
Thank you
When the running gear is warmer it is more pronounced.
is there a 4wd actuator in the front diff and if so, how do i test it?
is it possible that the tcase needs a fluid swap?
could the abs sensors be causing it?
What is a "running gear?"
No actuator.
It's unlikely the t-case fluid is the source of the issue.
No the abs only kicks in when your foot is on the brake pedal.
Go under the hood and pull out fuse 104, then go for a drive to see if the issue is gone. If it's not you're going to have to remove the front driveshaft then take a drive to see if the issue is gone.
Thank you Alloro, i will try the 104 fuse and see what happens.
Running gear is a general term for the axles, driveshafts, diffs. The stuff that moves while the vehicles is driving. Sort of like drivetrain for motor/trans/tcase.
There is not a 2wd option on the selector. Awd, 4wd, 4wd-low are all it has.
My bad, thinking it had the 2WD option.
With no 2H, the front hubs, half shafts, diff, and front driveshaft will always be rotating when ever the truck wheels rotate.
When you are in A4WD the clutch in the transfer case should not be duty cycling unless you have a variance between front and rear wheel speeds.
Since you had this issue before changing the rear diff fluid, I don’t *think* the rear diff is the cause. I’m leaning toward the transfer case fluid being the cause of the problem. Will your scan tool allow you to graph the front wheel speed sensors and the rear axle speed sensor when going turns?
And pulling fuse #104 as Alloro mentioned, that will disable the transfer case clutch to see if the problem disappears.
Update: i pulled the fuse, changed the t-case fluid, got all tires the same pressure and left for vacation pulling a 2600lb travel trailer and much gear in the way back. I had also installed air lift bags inside the rear springs and I'm glad I did. The problem persisted, but was more noticable with the trailer and it would make the sound more turning left, but with moderate power it would even do it while on an on ramp. The whole trip was a little over 2200 miles. I put the fuse back in after the first day because we were in the Badlands and it rained (and hailed!) and we didn't want to get stuck in that mud. The awd works good and later in the deep loose sand by a lake it made all the difference. We had problems with running into the wind at even a modest 65mph, and at one point the top rad hose came off while turning 3800 up a long grade in second. Turns out the fan clutch was bad. Glad we had a ton of water with us.
if I only use part throttle, the sound and feel is negligible so I'll just have to live with it.
Some of the rear ends with tight clutch packs need a few tubes of friction modifier
Like 4
You try that
Add them one at a time and go do figure eights in a parking lot to re evaluate
Good luck
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