Power steering system failure because of one or more of the following:
1- the belt is very loose or has come off
2- lack of fluid in the system
3- steering pump failure
4- clogged system (possible but unlikely)
5- diverter valve in either the rack or box has failed
6- if you have electric assist, have the system checked
SOURCE: 1996 chevy 1/2 ton pick up steering feels very heavy
This usually happens when pump has internal wear, lowering pressure output. Not always noisy either. If caster is set too far positive that can make heavy wheel as well. If pump dosent make enough difference, take one alignment shim out of the rear of each control arm and install at front pack. This may change toe in a bit so watch tires and adjust accordingly.
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