ok good idea or bad to weld front diff need more help lol
What more do you need? What specifically will you be doing with the truck?
Once you weld the front differential there is NO way the front tires will turn at a different speed when the hubs are locked. So, if you plan on driving it in the winter with the hubs locked (even in 2wd high) every time you turn you put a tremendous amount of stress on your front axle shafts and joints. Unlike the rear, you have all the weight of the engine and most of the transmission on your front tires making binding a lot harder. You might encounter steering problems on pavement (understeer). If you try to turn in the snow, chances are the truck will push straight.
If the truck is a trail rig, then welding the front diff will get you through a lot more at a greater risk of parts breaking. If you are going through mud or hill climbing it will get you through a lot more than an open differential.
You need to be honest with your goals. If you never need 4wd on the road, you can weld the front and simply keep the hubs unlocked until you reach your trail. If you drive the truck all the time and do need 4wd on pavement (say winter) then I would suggest AGAINST it. If this is your only vehicle and you can't afford to have it broken down then don't do it. If this is is a dedicated off road rig then all you have to lose is the potential of failure.