Drivetrain questions??

[Jcervo]

Good day to all T4R guys and gals. I am need of some seroius education.
My current issue is with my 04 Sport. I believed the cv axles were going bad, du to the noise. Then it stopped moving! I had my great neighbor come and help me install new cv axles.................very excited........still the same! So internet tells me no transfer case. This is a full time 4 awd and now I'm lost. The truck won't stay still in park and won't move unless I turn on the differential locker.........I would greatly appreciate any and all advice in thi entire drive line. Thanks to all.

 

[ARunner]

Not a lot of detail here to go on, but I'm suspicious that the "noise" was not from the axles but from a problem in your transfer case. And when you "lock" the differential, you're getting power to only the front or rear (your guess is better than mine). I'm suspicious of a serious problem with your transfer case. Based on what you've said, it sounds like you have a V8 with the full time 4wd system.

 

[techno]

To start the troubleshooting, I would have a friend look under the truck and see if either of the driveshafts are rotating when you try to drive. If a driveshaft is rotating, then this could mean the transfer case is good, but the front or rear differential is the problem area.

 

[RonJR]

With open differentials in the center and in both axles, if any wheel is disconnected from the drive train you'll get the symptoms you describe. Could be a broken CV (you've addressed that) or a defective differential (either end, can't tell based on available data), or a defective transfer case.

To troubleshoot further, park on a level place, chock the rear wheels, and put the vehicle in park with the center diff unlocked and the engine off. Jack up both front wheels, crawl under it, and try to turn the front drive shaft. It should not turn. If it does, the problem is in your tcase. If it does not turn, crawl back out and try to turn one of the front wheels. The other front wheel should turn in the opposite direction. If it does not, the front diff is bad or a front CV is broken. If the other front wheel turns properly, the front end is OK.

Now do exactly the same thing again, only this time chock the front wheels and lift the rear. Again, try to turn the rear drive shaft and one of the rear wheels.

By doing this you should be able to isolate the defective component.

I'm betting on a broken stub axle in the front diff. That's the part inside the diff that connects to the CV shaft.

 

[Jcervo]

OH yeah

I'm all over it. This is great info. Thanks for your knowledge. I will get back with the results after this weekend.