EVO Steering Bypass Kit From GM

Performance modifications, tips & tricks

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Whipped383
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Post by Whipped383 »

Right, and after looking the spool valve looking part behind it that is shimmed for your pressure relief remains the same. In my case the fitting was the only part I changed from an older pump, same as the kit does. I just opted to use the 96 line instead of that hokey looking thing the GM kit comes with.

It seems to me no matter how EVO is bypassed it results in full pressure all the time.

Whipped383
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Post by Whipped383 »

Image

That's what I used

Hog
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Post by Hog »

That part looks familiar.

Doesnt the diameter of the hole in the center of that part affect fluid flow?

On my 1997 ECSB C1500, 100% OEM, except for tires going from a crazy over assisted feel, with some steering off-center darting at about, at about 40mph, with easy over assisted easy 1 finger, stop to stop steering.
I then did the GM EVO Bypass with no other changes.
When turning the steering wheel from stop to stop on the same asphalt surface in front of the garage, it steers with more effort, and while I can still "one finger" it, that same index finger requires some assistance from its neighbouring thumb. It "feels" tighter than with the malfunctioning OEM EVO parts but has the feeling like its providing more assist, than the 1989 rclb C1500, the 1992 rcsb C1500, Ive owned. But is providing the feeling of less assist than the 1998 ECSB K1500 and the 1997 rcsb that was in the fleet. I guess it is important to note, that when I am talking about steering assist "feel" that I am also comparing the EVO trucks (1997+) also at a stop in park on the same surface, as the variable orifice is affected by changing conditions.

Here's a pic of the GM bypass kit showing its wonky tubing affair.
Image

peace
Hog

Whipped383
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Post by Whipped383 »

Well there's a little spool valve that sits behind it that controls the pressure, iirc JR had discussed that earlier in this thread.

I have never drove a an EVO equipped truck working, bypassed or not working that had a "tight" feel to it or a "centered" feel to it. I think I could maybe be happy if it worked like it was supposed to but the i get in my gmt800 and it has a steering feel that I like

Speeder
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Post by Speeder »

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clunkdog
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Do I replace my steering box next, with the 96 version?

Post by clunkdog »

Guys, new to the forum, owner of a 97 K1500 with 150,000+ miles. We don't use it every day any more, but we love this truck.
About a year ago we started having steering problems, and I assumed it was the pump. I ordered and installed the AC Delco pump without the reservoir, requiring the old unit to be dismantled, etc. At the time I did not know what the EVO was, but figured I needed to pull the part from Whipped's pic and install the old EVO to hook everything up.
Ever since this repair the truck has little-to-no assist at low rpms - for example, when slowing to make a a right hand turn with my foot on the brake, the steering gets very hard to turn.
Sitting still at a stop light, the wheel will not turn until I step on the gas. Parking is a difficult two-foot affair. It makes no difference if I unplug the EVO.
Is my problem the steering box? If so, should I just install the 96 and unplug the EVO?
Thanks!

Whipped383
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Post by Whipped383 »

I would make sure your o ring is in the correct spot on the pressure fitting before you go much farther. I have seen many people install the o ring in the wrong spot and it covers a port on the fitting

clunkdog
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Post by clunkdog »

Thanks, I will check that out!

jcoker
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Location: North Carolina

2002?

Post by jcoker »

This has been a very informative read. I have the same over-assisted steering in my 2002 Yukon XL. Lots of talk about 96, 97, 99, etc., but will the 96 steering pump work on 2002? How about the earlier gearbox, if it comes to that.

Again, very informative read and my thanks to all that contributed.


JC

whitelightning151
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Re: EVO Steering Bypass Kit From GM

Post by whitelightning151 »

I did this bypass on my 99 Chevy C3500. The truck has the Hydroboost. I didn't want to pay the $80 dollars at the time for the bypass kit so I went to the junkyard and pulled the old style fitting out of a pre evo ps pump and then just ordered a 96 year model line. I still have the 99 ps gearbox. Before I did this you would actually have to fight the truck going down the highway it was awful made you drive like a drunk driver.

The truck drives good now, but it's like the steering is too easy now wish it was firmer cause you do still have to stay on top of it cause it does want to wander sometimes. I bought the front stabilizer shock kit to firm it up, but from what comes in the kit it is for a 4x4 type front axle. I looked at modifying it to put it on, but wouldn't be a cut and dry task if work at all.

Has anyone been able to do something to firm the front end steering back up a little bit? The truck is 2 wheel drive and I have replaced all other front end steering linkage parts as well as the ps pump plus new upper A arms and lower ball joints.

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Re: EVO Steering Bypass Kit From GM

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Re: EVO Steering Bypass Kit From GM

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Re: EVO Steering Bypass Kit From GM

Post by rsbereavement »

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