Stuck CV - Or Trans?

wesinls

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My bother picked up a car last weekend (LS3 with an S5 and 934's.) and at the end of the 1st trip one of the wheels bound up - made a noise and was then binding when he'd try to drive it...I tried towing him - but after a few feet the wheels locked up (i cant say for certain if it was one or both sides).
Since he was only 1/4 mile from camp, we just took off the axle and both CV's on the one side he assumes was the problem - and I towed him back to camp - it towed and rolled easily.

We assumed / hoped it was a CV - he cleaned them up and apparently, both look decent / no smoking gun.

Does that make sense? Meaning - if we took off the axle and the car towed just fine, how could it be the trans? I'd think that if the trans was a problem, even with one axle on it making it spin, it would still lock up?

I'm hoping he just hasn't noticed something majorly wrong with one of the CV's...I told him to clean them - and compare to one of his new spares. It's his first time taking them apart / putting CV's back together, and cause he's my brother, I told him he's a douche and just doesn't see the issue. :) - Hoping for his sake it's not the trans.
 
Thinking the wheel bearing has seized.

Edit to say probably not the wheel bearing if you removed the axle and it rolled freely.
 
Did he check that the clip was still on when he removed the CVs? That happened to my pops over New Years twice. His limit straps had fatigued enough that when his rear wheels came off the ground, the inside clip would blow off the backside of the axel and the inner CV would bind and the wheel wouldn't spin. Put a shorter limit strap on it and immediately fixed the issue. CVs weren't wasted but the star was pretty banged up from the end of the axel spinning on the outside of it.
 
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