OK, so hubs locked and in 4-hi - Can you still turn the front driveshaft? I know you said it will rotate but I am not sure if the hubs were locked when you were able to do this... Make sure they are BOTH locked in all testing... it has been known to happen, someone means to lock both but only locks one so double check. If one or both of the hubs were not locked in this test one or both the outer axle shafts will turn inside the hubs although in opposite directions by way of the spider gears in an open carrier. If the hubs ARE both locked and the driveshaft still turns, you can point focus at the diff having an issue with some sort of spline or gear contact... not bearings so much.

When you put it in 4-lo you can no longer rotate the driveshaft. That tells me the issue is within the transfer case where the clutch is no longer allowing slip because in 4-lo you are in a locked mode. So the TOD or clutch sounds like the problem to me since 4-lo seems to work.

If something happened in the diff it may have taken out something in the TOD.
Quote Originally Posted by LittleBeast View Post
Yeah the lights work just like they always have, and there is no indication that it is not engaging correctly, when it is in 4Hi I can turn the front driveshaft (which I should not be able to do in the 1st place), then when I engage 4lo I can no longer freely turn the front driveshaft, therefore I know it has locked in 4lo and should be turning front wheels, but it does not, and once again no weird noises no popping, no clicking nothing out of ordinary other than it is riding a lot more quiet on the highway and getting much better gas mileage. Oh and I can actually break the back tires loose now, where as before I could feel TOD transfer the power and I couldn't drift the VX, now it is cake to get it sideways while in TOD.



Neither 4hi or 4 lo has front wheel drive.



I am thinking it has something to do with the new gears put in. I did the install but NOT the setup. I had the rear 4.78 totally rebuilt with the LSD, but the front 4.78 just had the 4 bolt flange replaced with our 6 bolt flange, they did not feel it necessary to rebuild.

My questions since I do not know what exactly can break inside a differential too well, is:

-what inside of a diff (pumpkin) 3rd member can break that would cause no other signs than simply no power to wheels?

-If CV's broke wouldn't I experience some sort of noise while driving?

-Also if the Hubs broke once again wouldn't I be able to hear or notice something?

-Could I infact have destroyed the clutch or engaging mechanism inside the TOD transfer case? But wouldn't the front diff still not allow free movement of the driveshaft if this was true?

-It has to be inside the diff then right? Should I drain the front diff fluid and see if there is any metal shavings in it? Can you blow a carrier bearing? I need to start taking it apart again, JOY!



I think you may be correct. Sigh.....