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Old 05-10-2014, 08:24 PM   #1
Join Date: Nov 2013
Location: Moorhead, MN
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ATF in Power Steering?

So I'm looking for fluid types in my haynes manual and it states that ATF+4 Type MS-9602 fluid must be used in the power steering system. But I hear elsewhere that I should just use regular power steering fluid. It's a 1991 Jeep Wrangler YJ 4 cyl 2.5l. I've also heard that the ATF should only be used in 2000 and newer wranglers?

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Old 05-10-2014, 08:41 PM   #2
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Its been awhile since ive put any fluid in my power steering but im pretty sure ive used PSF. Although im in the military and we ate told to use PSF in our humvees but ATF works better. Best thing is too look at the color or smell the current fluid. If its clear - briwn and had little to no smell I would say its PSF. If its red - brown and smells like crayons then its most likely ATF.

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Old 05-10-2014, 08:55 PM   #3

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Back in the day they were all ATF. In a Wrangler ATF will work its an GM pump.
89 2.5 TBI, 4" RC lift, 1" Booms, SYE, Adams Driveshafts front and rear, Ford 8.8 with 4:88s, BFG 33X12.50X15, and a ton of other stuff.

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Old 05-10-2014, 09:02 PM   #4
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I've used ATF in mine different when I don't have PSF handy. Never a problem.
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Old 05-11-2014, 10:13 AM   #5
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I currently have PS fluid in my 89 but the pump was replaced. Now that I think of it there was PS fluid in my original pump also.
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Old 05-15-2014, 02:43 AM   #6
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Location: Moorhead, MN
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I finally remembered to check today. I take it that power steering fluid is in this rather than ATF? Appears more a green/brown color and doesn't really have a strong smell.
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Old 05-15-2014, 06:37 AM   #7
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Location: Denton
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i have a slight in my chevy k2500 power steering. i drained my power steering pump (turkey baster to suck iy out works great BTW). i filled it back up with lucas power steering stop leak. works great now. no whine while turning or at full lock.
old stuff was was burned and smelled horrible!!!
CURT. 1990 YJ. 4.6L stroker 31x10.50 fallen all terrains on chromed steel wheels. 3" body lift MC 2150 and lift coming soon.
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Old 05-19-2014, 11:52 AM   #8
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I've always used ATF. Never had a problem. My .02 :-)

1991 Jeep YJ HO 4.0 5-Speed <--- My Jeep is a pickpocket!!
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