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Don't do it man, it is an accident looking for a place to happen. It's outlawed in every racing sanctioning body that I know of............for a reason. You can buy a "mini spool" for most applications for a decent price, if locked is what you really want. Welding in there on already heat treated parts is a very bad idea. It puts a lot more stress on the spiders/axles than they were designed for ........and then overheat them? nope, don't do it.
Welded on the front? that's even worse. You may get away with that on a mud bogger or puller that never sees the street or even trail riding/wheeling.
You WILL break the short side axle (at the joint usually) when turning. Haven't you ever sen the "Pro" truck pullers when they pull up to the line? They have a helper run over and lock in one hub right before they take off. They do all of the driving around the track with one hub unlocked, for two reasons: It drives like crap locked up and the short-side axle is taking all of the abuse.
I ran a Tru-Trac in the front of my 74,454,4spd one ton truck. I did some ameteur pulling with 35" ground hogs and did my street driving and off-roading with 40" Mudders. I broke an axle even with that.
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