hello changed king pins /s box steering rod car steers okay on road however the stering heavy when parking and starting used rare spares parts thanks warren
Warren,
Several things that come into effect here with the fitment of new kingpins. The first and most important is the need for a wheel alignment after the kingpins have been fitted. Removing and replacing the stub axles from the upper and lower outer pivot bushes will affect the caster and camber. This will need to be rectified.
Another thing to check with heavy steering, disconnect the tie rod end from the stub axle and see if it kingpin turns smoothly with no binding. It should just take a gentle push (1 finger) to turn it from side to side, make sure you check both sides. If the kingpins turn freely try and turn the steering wheel to see if it is still heavy. If so, it may be that the idler arm is binding or seized. Disconnect the the pitman arm from the steering box and check again. If the steeering is still heavy the fault lies within the steering box.
So in order, I would check that the kingpins are able to turn easily, while the car is jacked up I would also check the steering. if all seems good, I would have the car wheel aligned as this is the most likely cause of your problems
Keith