? i like to know is my independ suspension strong enough for a 350 with 400t and np208 in my 4x4 b2600

 

Most likely no. What year are you talking about? What size tires? What gear ratio? etc.

If you drop the gear ratio far enough (down to crawler speeds) you can reduce the forces applied to your drivetrain, similarly, if you don't go crazy on tire size, that helps things survive as well.

I've got a 74 Ford Bronco, solid axle front/rear, and I can still break drivetrain parts with 35" tires & 4.56 gearing. (D44 front axle 30 spline axles, D20 Transfer case, C4 trans.)

 

its in a 1987 b2600 4x4 and my ? was about weight waise

 

its in a 1987 b2600 4x4 and my ? was about weight wise

 

Your truck would sit like a stink bug (low front, high rear) I'd estimate you'd be adding at least 400 lbs to the front of your truck.

Weight is fine, but the stresses on your truck are from weight and the power of that drivetrain. I'd be surprised if your stock axles would hold up to that kind of power.