737IP

After 16 years and 216,000 miles I replaced my power steering pump on my 94 SR5 truck with the 3.0. In doing research for this, I learned I should be been using ATF and not PS fluid. Yes, I know now it's on the cap. It didn't seem to affect it though. With the new pump, I did my best to purge all of the PS fluid from the system and replaced with Dextron ATF. After much bleeding most of noise went away. After a short drive it is making noise again and the pump has a slight vibration. I am wondering if I did damage mixing dissimilar oils.

RSR

Shouldn't have caused an issue.

Sure it's the pump making the noise?

Did you get all of the air/air bubbles out?

If the pump, your replacement may have an issue...

rokblok

iTrader: (1)

Dissimilar oils shouldn't have caused any issues, except maybe for the very slight possibility that an internal bearing failed. But that would tell me that it was a cheap rebuild in the first place. Or that the shaft/pulley mate is weak/loose.

I've run mine with ATF and P/S fluid mix for 75,000+ miles. Still fine. OE stock pump

thisismyusername

What kind of noise? Is it screeching? Could be your bearing on the belt tensioner or what of the belts. Can make a similar noise to a power steering pump going out.