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Help diagnose a power steering issue on my 99' GMC

Thanks for all the input. I own the OEM service manuals for 99 Chev/GMC/Cadillac C/K series GMTs. The section on ABS is in book #1. I browsed it today but didn't see anything that jumped out at me, but I'm a total novice to ABS. That being said, I broke out my mechanic's stethoscope and put it...
- txgp17
- Post #11
- Jul 24, 2023
- Forum: Engine Performance + Maintenance
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Help diagnose a power steering issue on my 99' GMC

Yes, the CV axles were replaced a few years back. It got all new control arms because the ball joints were shot. They were replaced on both sides. This is a good point because the pulsation seems to NOT be directly tied to engine speed. Yes, it occurs at slow engine speeds, but it does remind...
- txgp17
- Post #5
- Jul 22, 2023
- Forum: Engine Performance + Maintenance
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Help diagnose a power steering issue on my 99' GMC

The truck: 1999 GMC K-3500 (old body style), 5.7 engine, 4L80-E, with hydroboost brakes, 232,000 miles, I'm the original owner, this is the OEM power steering pump original to the truck. Lately, if you turn the steering wheel fast while driving slowly, there's a popping sound coming from the...
- txgp17
- Thread
- Jul 22, 2023
- power steering pump hydro boost circuit
- Replies: 12
- Forum: Engine Performance + Maintenance
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Engine Oil Cooler Upgrade: Add 2 quarts! (SAS guys you'll want to see this)

For anyone running a 13/16-16 thread filter, like the one used in this mod, Donaldson makes a synthetic filter that's much better. It's a P166564. The P550964 is rated at 40 microns, while the P166564 is rated at 22 microns. I think this is an awesome mod, but not option for me as I have no...
- txgp17
- Post #22
- Oct 24, 2013
- Forum: Engine Performance + Maintenance