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Old 01-26-2019, 10:47 AM   #1
frenchy51
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steering too light-74 Blazer

I've completely restored my '74 K5 including all new suspension components and new power steering box. I've also had it aligned and installed new radial tires (more street radial than off-road). It seems a little "darty" on the road and the steering effort seems too easy. It's not dangerous or anything like that but you have to pay attention to keep her on the straight and narrow. I know it's not going to drive like my newer Z71 but is there a way to firm up the steering ? Or? to make it more driveable? Thanks
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Old 01-26-2019, 12:59 PM   #2
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Re: steering too light-74 Blazer

Maybe the steering box wasn't rebuilt correctly? Hello from Chester!
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Old 01-26-2019, 06:11 PM   #3
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Re: steering too light-74 Blazer

No, the new trucks steer too heavy.
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Old 01-26-2019, 06:37 PM   #4
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Re: steering too light-74 Blazer

When I had new tires put on my c30 it was like that....it would jump all over the road.....talked to the tire man and he said drop the air pressure in the front tires.....I think they had 65psi in them ...I dropped to 50 and it helped a bunch....

Very nice 5 you have!!.....
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Old 01-26-2019, 07:42 PM   #5
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Re: steering too light-74 Blazer

Could be the new steering box is more responsive then the old one.

Could be you just got used to a worn suspension and a fresh new one seems strange.
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Old 01-26-2019, 07:48 PM   #6
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Re: steering too light-74 Blazer

Subbed

My 77 feels the same it seems to steer way to easy. I wish it was a little stiffer
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Old 01-26-2019, 08:20 PM   #7
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Re: steering too light-74 Blazer

Steering box needs to be tightened
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Old 01-26-2019, 08:33 PM   #8
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Re: steering too light-74 Blazer

I agree with the above about the tire pressure as you first check as far as the wandering. My 31x10.50s I ran typically about 32 lbs for most day to day things. To me the squares always had a light feel compared to the GMT400 and newer trucks, as well as the older ones. That power steering is super easy to move.
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Old 01-26-2019, 09:48 PM   #9
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Re: steering too light-74 Blazer

Old PS is basically one finger steering as designed. If the toe is off it will make it dart much like described. I think the recomendation is to have slight toe in.
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Old 01-26-2019, 11:01 PM   #10
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Re: steering too light-74 Blazer

Mine was like that on the highway. Turned out they aligned it with 0 caster. Did they give you a printout of what the specs were after alignment?
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Old 01-26-2019, 11:24 PM   #11
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Re: steering too light-74 Blazer

If these links work they might explain how to correct your problem.

https://www.jalopyjournal.com/forum/...-quick.953042/
http://jeffd.50megs.com/Pump_valve_mod_page.htm

http://www.gmtruckcentral.com/articl...rsteeringmods/
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Old 01-27-2019, 11:14 AM   #12
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Re: steering too light-74 Blazer

Quote:
Originally Posted by 1968k20 View Post
Maybe the steering box wasn't rebuilt correctly? Hello from Chester!
Hey back! Stay warm....I'll drop by when the snow melts.
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Old 01-28-2019, 11:24 AM   #13
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Re: steering too light-74 Blazer

Very easy fix. Go to Speedway website and order their pump flow control valve, don't have the part # handy. Stock pump puts out 3 gpm, replacement valve is 2.5 gpm I believe. Make sure to also get the o-ring to flare fitting adaptor. All in costs around $20, change it in 10 minutes.
I did this swap on my 75 Jimmy and steering feel is like my Duramax. Also did my 70 Chevelle and a few other 70's in my fleet and am more than impressed with how such a simple fix this is. That 3 gpm factory flow rate was there to produce that 1 finger steering feel, which today feels way too light compared to modern vehicles. Speedway sells these for the circle track crowd.

Post back after you do the swap, curious if you have similar results.
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Old 01-28-2019, 11:47 AM   #14
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Re: steering too light-74 Blazer

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Originally Posted by stanski View Post
Very easy fix. Go to Speedway website and order their pump flow control valve, don't have the part # handy. Stock pump puts out 3 gpm, replacement valve is 2.5 gpm I believe. Make sure to also get the o-ring to flare fitting adaptor. All in costs around $20, change it in 10 minutes.
I did this swap on my 75 Jimmy and steering feel is like my Duramax. Also did my 70 Chevelle and a few other 70's in my fleet and am more than impressed with how such a simple fix this is. That 3 gpm factory flow rate was there to produce that 1 finger steering feel, which today feels way too light compared to modern vehicles. Speedway sells these for the circle track crowd.

Post back after you do the swap, curious if you have similar results.
Thanks-good advice. I'll head to their website. Nice Blazer!
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Old 01-28-2019, 02:34 PM   #15
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Re: steering too light-74 Blazer

is there a solution to the guys running LS style power steering pumps? I used the original valve from my 79 pump in the 2006 pump to keep the inverted flare style fitting. My steering is really light and darty
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Old 01-28-2019, 05:02 PM   #16
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Re: steering too light-74 Blazer

For those that think the 70's era squares have too light a PS touch, don't even think about getting in a 60's era car with PS. When I still had my 68 Impala and my dad owned my current 75 C10, I always thought the 75 had heavy steering. Sometimes wondered if there was something wrong with the PS in the 75 it was so much harder to turn.

Had just the opposite view of the brakes. Truck has PB, Impala had manual. Had more then one tire squealing stop in the truck because of that.
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Old 01-28-2019, 06:52 PM   #17
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Re: steering too light-74 Blazer

You said you did an alignment,good. What were the caster readings? Too little caster can cause the light steering effect. You would have positive caster. You can increase the steering resistance by putting in some caster wedges on the axle. I had the same thing on my K20 after a 4" lift,it felt like I was herding chickens and I had to pay way too much attention to my steering as it felt too light. So try adding a few degrees of caster w/wedges. Not an easy job but it worked.
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Old 01-29-2019, 10:45 AM   #18
frenchy51
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Re: steering too light-74 Blazer

Quote:
Originally Posted by stanski View Post
Very easy fix. Go to Speedway website and order their pump flow control valve, don't have the part # handy. Stock pump puts out 3 gpm, replacement valve is 2.5 gpm I believe. Make sure to also get the o-ring to flare fitting adaptor. All in costs around $20, change it in 10 minutes.
I did this swap on my 75 Jimmy and steering feel is like my Duramax. Also did my 70 Chevelle and a few other 70's in my fleet and am more than impressed with how such a simple fix this is. That 3 gpm factory flow rate was there to produce that 1 finger steering feel, which today feels way too light compared to modern vehicles. Speedway sells these for the circle track crowd.

Post back after you do the swap, curious if you have similar results.
PM sent but I forgot to mention that I'm running a Vortec 6.0 motor with it's PS Pump mated to the original type box. Will this valve work with that pump also? Sorry for the omission on engine type! (must have been a Senior moment...)
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Old 01-29-2019, 12:14 PM   #19
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Re: steering too light-74 Blazer

Great to see all of these solutions. Seems that it's a good idea to optimize tire pressure to get the full contact patch regardless. And checking in on the alignment specs. I haven't read the links yet but I plan to check them out.

I'm curious about using a larger pulley. Either one specifically for under-driving the PS or if there is one from a different factory application that would work.

Totally unrelated and maybe a little silly but this is my post 777 and I grew up in Boeing town. My first job out of college was on a factory expansion for that plane.
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Old 01-29-2019, 12:45 PM   #20
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Re: steering too light-74 Blazer

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Originally Posted by frenchy51 View Post
PM sent but I forgot to mention that I'm running a Vortec 6.0 motor with it's PS Pump mated to the original type box. Will this valve work with that pump also? Sorry for the omission on engine type! (must have been a Senior moment...)
looks like we're in the same boat, I ordered the valve and flared fitting adapter from Speedway. I figure if the original valve from the 79 fit in the 06 ls pump, then the speedway valve for early gm style pumps will to. $38 shipped is a far cry from the $400 steering box I've been wanting from CPP, so hopefully this works
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Old 01-29-2019, 07:00 PM   #21
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Re: steering too light-74 Blazer

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Originally Posted by GMC Guy View Post
looks like we're in the same boat, I ordered the valve and flared fitting adapter from Speedway. I figure if the original valve from the 79 fit in the 06 ls pump, then the speedway valve for early gm style pumps will to. $38 shipped is a far cry from the $400 steering box I've been wanting from CPP, so hopefully this works
Did you order the 2.41 GPM valve #25309000? What is the part # of the flared adapter? I haven't ordered yet......Maybe I should wait and see how you like it....Thanks! Let me know how it works. (-;
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Old 01-29-2019, 08:38 PM   #22
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Re: steering too light-74 Blazer

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Did you order the 2.41 GPM valve #25309000? What is the part # of the flared adapter? I haven't ordered yet......Maybe I should wait and see how you like it....Thanks! Let me know how it works. (-;
https://www.speedwaymotors.com/Musta...-GPM,5852.html
this is the one i ordered, looked like the only option for use with original style flared hose ends. All the others have a 6an fitting
Here's the adapter
https://www.speedwaymotors.com/O-Rin...ter,24682.html
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Old 01-29-2019, 09:35 PM   #23
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Re: steering too light-74 Blazer

Question how would this mod work with hydroboost?
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Old 01-29-2019, 10:31 PM   #24
frenchy51
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Re: steering too light-74 Blazer

Quote:
Originally Posted by GMC Guy View Post
https://www.speedwaymotors.com/Musta...-GPM,5852.html
this is the one i ordered, looked like the only option for use with original style flared hose ends. All the others have a 6an fitting
Here's the adapter
https://www.speedwaymotors.com/O-Rin...ter,24682.html
Thanks for the information!
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Old 01-30-2019, 02:16 AM   #25
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Re: steering too light-74 Blazer

Zachary...I would think with hydroboost you would need to regulate between the boost and the steering box....I'm not 100% sure bout this...I'd have to do some more reseach...
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