i did a tbar crank and shackle kit on my 86 hardbody and now every time i hit like 45-55 the front end of the truck starts to shake ... i was wondering if any one has any idea what could be causing this problem it gets kinda scary some times.

Did you get an alignment after the t-bar crank? Changing the torsion bars to lift the ride height messes with your alignment and mis-aligned wheels can make you shake like that.

Yep. It's probably your tires scrubbing because you're toed in too far after the crank.

so just it could be from my toe in condition and from having it misaligned .... what would you recomend i do get the aftermarkt control arms from AC could that correct the toe and the shake? i dont really have uber amounts of cash to spend so i need to be fairly confident that what ever i do will fix it. im new to trucks and wheeling so any and all advice is welcome.

Take it to an alignment shop. Explain to the mechanic that you WANT it cranked up. You may find that you have worn parts that you did not know about. If so, you can probably do the work yourself, then take it back in for the alignment.

You'll have to get an alignment done, also check your TREs, idler arm & center link.

I had pretty much the same problem after installing a RC suspension kit, I also had to replace a worn out idler arm, TREs and CL, But once I did this and got it aligned all was good.

Also if you are going to wheel your rig you should get an idler arm brace. They are cheap insurance

alignment and worn out sus parts.

To have a good alignment you will need new uca's.

You'll probably need to rebuild your front suspension also. Get new ucs's ball joints and steering. When you pull the spindle it will be a good time to replace/repack the wheel bearings and replace the rotors/pads if need be.

my upper ball joints look pretty shot so im doing those and new upper CAs that come in the shockless lift from AC with rear add a leaf. im also going to do skyjacker hydro 7000 all the way around. good idea or no?

start rebuilding the suspension before you do performance mods. While you are rebuilding your suspension/steering you can install better stuff.

IE- Supperlift UCA's, Hohaa center links, sway-a-away t-bars. When you are replacing your ball joints and tre only buy MOOG. Anything els you'll be replacing in 6-12 months.

Once you have a stout steering and front suspension then you can buy new tires and a lift for the rear.

Here's My IFS build up from summer of 06. Looks like the pics have gone away. I'll have to fix that.
http://nissan4wheelers.com/eve/forums/a/tpc/f/717603133/m/93910480431/p/1