So have you made absolutely sure that front diff, which you said had been apart, is the same ratio as the rear? You problem sure sounds like a missmatched gearing issue.

Just curious, is this accompanied by any odd sounds, metallic or otherwise?

Frank.

Only sounds are some rumbling while moving, and the tires chirping to release tension. The drivetrain itself is kinda noisy as mentioned before but I don't think that has anything to do with it. I still need to confirm the gear ratios but have other fish to fry at the moment.
Grease used was very light, looks like whipped margarine.

Cool. I'm almost positive you have mismatched gears. There is no other way for your tires to build that kind of tension. I mean if one was binding say, your steering wheel wouldn't hop, it would pull to one side with tremendous force. They simply have to be either pulled or pushed faster than they are turning but consistently as to get the front end ocsillating or hopping.

Frank.

Probably in the front driveline/yoke/u-joints. I run into this all the time in the shop. Once-in-a-while-wheelers don't get the front joints lubed. They wear a little funny. Jack up the front and then check the front u-joint at the pumpkin. I'll bet its bad. It will feel OK unless you jack it up to test.

Tony
Owner - Maintenance Plus - (4X4 and offroad Mechanic)

Aha, a new idea, will check that out. Another thing to keep in mind is that I am almost positive my truck has never been offroaded. Front suspension and ball joints have no play, no scrapes on the bottom anywhere. And I have only used 4x4 rarely because of this issue, usually pretty tame stuff; gravel, snow, etc.

Ok so the update is the front end had different gears than the front? Thats horrable!

Maybe. The two operative theories at the moment are mismatched front diff or bad U joint behind it. The diff itself is in perfect shape, maybe out of an automatic, which came with stock 1:4.3 not 4.1
http://www.va4roc.com/archive.htm#reference

Once again Roger has exactly the reference needed on his web page. Now I just gotta hope the "pinion flange shaft" is easily visible and still has the color code on it...
If it turns out one is a 4.3 I may just swap the other to 4.3 instead of both to 4.1. Minor difference but might as well. This would also be the time to get a 4.3 LSD if the rear is 4.1, hmmmm...

i had one of these do the same thing. jack passenger front wheel off ground leave the others on ground. try to turn the pass wheel back and forth by hand while watching your steering arms. especially your pitman and idler arms. my idler was worn and letting the steering arms move up and down. this is very common with the ifs front. it would pull one wheel in, then the other when its locked in 4x4. that is the open diff switching back and forth. when its in 2wd there is nothing pulling on the front wheels to make them go L to R. have someone stand in front while you drive toward them to see what its doing.
if it is different gears front and rear. you should hear and see some serious tire slipping, just when idling around. for your sake i hope its just the idler arm. its much easier to fix.

ok man i'm about 99.99 percent sure you have missmatched gears. my bro bought his truck about 3 months ago with the same problem. you can either do it yourself or take it in to a gear shop to check. we just put his up on blocks and counted rotations.