I have some problems with scharp korners or roundabouts (the weehl does not turn enough in)here in Germany, and have also pump steer that I need to work on.
I also have a very rough ride (350-350 combo) and thinking about doing somthing with my leave springs since everything else is new. Changed the Shocks from Gas (ccp)to a cheeper type but it has not changed much. Would like to go to IFS but that doesn't make sence with all that money spend with brakes, steering and everything else new.
Bernd,
The CPP power steering conversion worked fine when I installed it on my truck. But like you, I found that it gave very poor steering lock. I fixed this by shortening the steering arm (the one that bolts to the spindle) by 1 1/16" inch. I did this by building up each side of the arm with weld to create enough material for the new boss where the CPP one necks down. I then bored a 7 degree included angle hole 1 1/16" nearer the mounting face. this was to accept the drag link balljoint. Once this was done I cut off off the original ball joint hole.
This modification increases the steering lock so that the track rod ends just clear the shock absorber mountings at full lock; it makes a big difference to the way the steering works. The steering still isn't quick by European standards (3.5 turns lock-to-lock) but I've found it's OK on crowded British roads, even in the centre of London.
Re. your suspension, I have a 350/Tremec TKO in my truck, I've found the ride is OK. Have you oiled or greased your leaf springs? I've found that it makes quite a difference to the ride as against having "dry" springs.
Good luck with your truck. Stuart.