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use copper bb's or airsoft pellets to balance your tires. put about 10-14 oz's inside each tire. and did you rebuild the king pins or no? if not kris will chime in about some adding a washer to make them tighter trick.
and if those options don't get rid f the vibrations, did you get your d-shafts balanced and what kind of angles are they running at? bad angles will make all sorts of wierd **** happen at any and all rpms/speeds.
and if all else fails, check around at all the tire shops to see if anyone has a trueing machine. it evens out your tires by cutting off the extra material in out of round spots. they aren't real common because they are expenssive machines, but someone may have one near you.
cut you toe in back to 1/8 and see how it handles. 1/4 inch is too much in my opinion. i set my solid axle toe between 1/8 and 1/16, and never have any problems with tire scuffing or weird steering issues.
After driving I have to issues with its handling. The power steering seems to be working too good, I figured with bigger tires and bigger axles the steering would be tougher to turn. However its quite the opposite which leads to a lack of road feel. Its also got some bump steer. These problems may be inherent with the modifications, but I think it could be better. Here is what I suspect.
A. The tires were over inflated making it feel a little squirrely and easy to turn.
B. I toed in the tires about a 1/4 of an inch. This may or may not be enough based on the size of the tires.
C. No steering stabilizer. (But it didn't have one before so I dunno about this one (I am definately going to make the upgrade to hydro steering one day but not anytime soon.
Do you know what caster you are running?
If you are getting bump steer and poor road feel, increasing it on both sides will help both issues.
If though, by caster you mean the c's that the ball joints bolt to in relation to the plane perpendicular to the ground, I cut them off and rotated them to about 6 degrees while I was adjusting my pinion angle.
K, that's what I was thinking too. I wander if having it toed in too much will cause it to turn too easy. Let me see if I can explain the situation better. When I drive it down the road it feels like there is slack in the steering, however, if I try to compensate for the 'slack' the truck goes the direction I compensated. It may be a good problem to have, but I like a steering wheel that has a little more road feel, and is a little tighter.
cool deal on the winch and bumper, but i'd be keeping that "junker" as a parts rig at the very least. looks pretty damn clean body-wise. and good clean short beds like that can fetch some cash.
I initially bought the truck with the intentions of taking off the good parts, then parting the rest out. The truck had been sitting for 9 years, and I got it for cheap. But when I washed it off and looked out how clean and original it was I figured it would be a shame to part out such a complete truck. It has an unfaded, uncracked original bench seat and even has the original owners manual in the glove box, so I think I may hold on to it for a while, and maybe restore it one day.
After driving around a good bit, I have decided that overdrive would be an amazing addition to the truck. Is they any good way to do this cheaply and strongly?
cheapest strongest option would be a zf5spd. from a later model f-250-350. you could scrounge around for an old warn or saturn overdrive unit that bolted on the tail shaft, but idk if you'd need an adapter or what. or a gear vendors over drive, which is crazy strong, but not anywhere near cheap.