Z-height (stock torsion bar setting)??!

[Yeti_Owner]

I've searched all over the stupid internet... Does anyone have the actual factory Z-height specs for a 1993 Yukon K1500?

 

[whiplash473]

I've searched all over the stupid internet... Does anyone have the actual factory Z-height specs for a 1993 Yukon K1500?

They generally differ from truck to truck. There isn't really a set standard.


Sent from my bored/stroked iPhone 6S

 

[michael hurd]

If you are meaning ride height, it would be valid for a certain diameter tire only.

If you want actual frame measurements, there are some at the GM Upfitter website.

https://www.gmupfitter.com/files/media/photo/170/1999_LD_CKTruckCurrent.PDF
https://www.gmupfitter.com/files/media/photo/170/1999_LD_CKTruckCurrent.PDF
Pg 28/29

If you want a full set of datum measurements of the frame, see your local auto body shop, they should be able to give you a print out for minimal cost.

 

[Yeti_Owner]

Sad to say the above posts aren't correct info, but thanks for tryin' to help guys : )

I was able to look up the service manual and get the numbers.

http://workshop-manuals.com/gmc/k_1...ns/vehicle_ride_(trim)_height_specifications/

The trim, or Z height, for these k1500 4x4's is 3.74 inches, measured between the bottom of the lower balljoint and the pivot bolt middle (see the below picture ref #13)

View media item 31093It's measured like this:

"Z" HEIGHT

1. Lift front bumper of vehicle up approximately 1.5 inches.
2. Gently remove hands and allow vehicle to settle on its own.
3. Repeat this operation twice more for a total of three times.
4. Measure "Z" height, Fig. 1.
5. Push front bumper on vehicle down approximately 1.5 inches.
6. Gently remove hands and allow vehicle to rise on its own.
7. Repeat this operation twice more for a total of three times.
8. Measure "Z" height.
9. Find the average of the high and low measurements. This is the "Z" height. "Z" height should be 3.74 inches

 

[TylerZ281500]

wonderfully useless information.

 

[Yeti_Owner]

wonderfully useless information.

Actually, it's hilariously critical. If you don't set the Z-height as above, all of the other steering geometry will be off (Camber, caster, toe) etc. It's step #1 for a proper alignment.

The "trim" or Z height is actually the proper setting for the torsionbar/control arms. It's independent of frame to ground, or tire-size, etc.

 

[michael hurd]

Actually, it's hilariously critical. If you don't set the Z-height as above, all of the other steering geometry will be off (Camber, caster, toe) etc. It's step #1 for a proper alignment.

The "trim" or Z height is actually the proper setting for the torsionbar/control arms. It's independent of frame to ground, or tire-size, etc.

Shh.... the crank to level, crank to lower, and crank 'til you can't crank any more crowd doesn't want to hear any of this. Geometry.... what's that?

Wheel offset affects scrub radius, loading of the unit bearings, stress on all of the mounting points for the control arms, stress on ball joints, and can also change the effective spring rate the wheel and tire package sees.

 

[TylerZ281500]

i guess its not safe to assume we all know this, useless because whose gonna listen to it when theres compans out there that dont know this selling products for our trucks and making a fortune. its more of a thing for the purist out there because who wants to stay stock? theres more effort in trying to fix what all these people and companys have helped to screw up steering geometry than fighting a worthless battle on, lets stay stock height. its a torsion bar setup, no one in the lifted or lowered worlds are gonna expect much from it for anything besides driving it.

 

[michael hurd]

i guess its not safe to assume we all know this, useless because whose gonna listen to it when theres compans out there that dont know this selling products for our trucks and making a fortune. its more of a thing for the purist out there because who wants to stay stock? theres more effort in trying to fix what all these people and companys have helped to screw up steering geometry than fighting a worthless battle on, lets stay stock height. its a torsion bar setup, no one in the lifted or lowered worlds are gonna expect much from it for anything besides driving it.

A person and their money are easily parted.

Yep, companies make products all the time, and people purchase them. Good, bad or ugly, there is a market for almost any product.

While you may chose to lift or lower your truck, you accept responsibility that goes along with modifying the vehicle. For instance, when a vehicle is lifted or lowered, do the headlights meet the performance criteria required in terms of aim and glare, and safety of oncoming vehicles?

Certain 'fashion' accessories like aftermarket LED tail lights for these trucks, and halo / projector headlamps are just that... for fashion. They do not meet FVMSS 108 standards, and can be downright unsafe.

Same goes for people running around with double stacked 50" lightbars on, blinding oncoming traffic. The vehicle operator doesn't give a flying F about anyone else, just thinks he can see better with his illegal and unsafe lighting, and too bad for someone else.

What he doesn't know is that with excessive foreground illumination, he can see less distance than with proper ( legal conforming ) lens and reflector design, and lower output.



Lifted vehicles - compatibility with other vehicles ( bumper systems ) in the event of a crash.

Hypothetically, you drive a solid axle swap 44" tire wearing, mud hoggin' 4x4, 'cause that's yer style. Bang. You drive over the front of a car in an intersection, it wasn't your fault... blah blah. Serious injury or death to an occupant in the small car you drove over?

A good lawyer for the opposite party ( family or individual ) will more than likely obtain a judgement against you for altering critical safety systems ( bumper height ) contributing to the injury or death of the occupant's car.

 

[TylerZ281500]

thats going way outside the hindsight of the topic, varys state by state, a lifted truck and lowered truck can all adhere to any law based on a persons knowledge of both that and what they are doing......