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kipps · 03-03-2023, 06:13 PM

Sometime around 1980, GM switched all these trucks from SAE flare lines to Metric O-ring lines. If you simply buy a 1977 steering gear, you'll have to do more complicated adapting to connect it to the later-model power steering pump.

Buy a steering gear for a 1985-era truck, and use the power steering lines for the 1985 as well. They should work perfectly with the pump on the 1990's serpentine setup.

Seriously consider buying a Redhead steering gear, instead of buying a parts-store steering gear. There is a considerable difference in quality. Redhead boxes have tighter tolerances than cheap boxes, and the result is very noticeable in highway manners.

03-03-2023, 06:13 PM	#2
kipps Registered User Join Date: Jul 2014 Location: North-central Virginia Posts: 1,104	Re: Power steering conversion Sometime around 1980, GM switched all these trucks from SAE flare lines to Metric O-ring lines. If you simply buy a 1977 steering gear, you'll have to do more complicated adapting to connect it to the later-model power steering pump. Buy a steering gear for a 1985-era truck, and use the power steering lines for the 1985 as well. They should work perfectly with the pump on the 1990's serpentine setup. Seriously consider buying a Redhead steering gear, instead of buying a parts-store steering gear. There is a considerable difference in quality. Redhead boxes have tighter tolerances than cheap boxes, and the result is very noticeable in highway manners. __________________ 1987 C6P V20 truck, 2010 LMG 5.3, AFM delete, 2010 Camaro exhaust manifolds, 1997 nv4500, 1991 np241c, hydroboost, 2005 14bff axle & driveshaft, drop-n-lock gooseneck, 4.10 gears, stock suspension, rims, and tires. Still a work in progress. Any questions or suggestions are welcome!