I’m going to just throw this out after digging into these steering boxes. From what I’ve can see is there were at least 3 different versions for our trucks…maybe more. The Borgeson, from their own site, confirm fitment for all 88-98 years. So why did GM make different versions, yet Borgeson has it all figured out in one box? I found this yesterday on another forum from our own
@Schurkey:
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Seems the same basic steering gear design is used on 1988--2000 vehicles including C/K pickups, Suburban, Blazer, Yukon, Tahoe, and even some Dodge Ram trucks, including 1/2, 3/4, and 1-ton vehicles.
In my search, four part numbers show up for these vehicles from 1988 to 2000. All have three mounting bolts, the same plumbing threads (M18 X 1.5; M16 X 1.5), the same size input shaft (3/4"), the same diameter output shaft (1 1/4") and the same spline count (32). In short...should be interchangeable.
NSP 88278091 = the one specified for my truck (88--95 C/K1500, and others)
Gear box turns = 2 5/8--3 1/16
NSP 88278117 = 1996 C/K, various Suburban, Tahoe
Gear box turns = 2 5/8
NSP 88278090 = 1997--2000 C/K, various Suburban, Tahoe, Ram
Gear box turns = 3 -- 3 1/2
NSP 88278127 = 1999--2000 Escalade, 1998-1999 C/K and Suburban, 1998--2000 Tahoe
Gear box turns = 3 1/16”.
This to. According to this, Saginaw made many different versions for our trucks. It only makes sense that one that came with EVO would have a different box than a 1995.
Our comprehensive guide will help you identify your power steering gearbox. We sell & service 5 different Saginaw gearboxes: Saginaw 800/808, 708, GMT & Ford.
leepowersteering.com
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There were different pumps as well that were paired with appropriate steering gears. Anyway, it’s got me wondering.