2 questions....Pictures!

[Voymom]

I was out and about under Phantom last night, as I like to look at things and try to learn what they are. Plus with the wedding planning I haven't been able to show Phantom any attention lately. Anyways I was looking around under his belly and I seen this....what is this? It is behind the drivers seat, but in front of the fuel filter. It has 2 clips of wires, but there are 5 metal lines coming out of it.

Second question...When I was under Phantom I can lay on my back and slide my entire body under him on the drivers side, but when I tried to slide under him from the passenger side, I could not get passed my boobs Mat and I took a measuring tape, and noticed that he is 1/2 inch to 3/4 inches lower on the passenger side. What can cause this? Our tires are evenly and properly inflated on both sides front and back. No extra's like tools weighing one side down, and no one in the truck, and we were parked on even ground. And the tires are worn evenly.

Drivers side

Passenger side

 

[CdnGMan]

To address your second question, does Phantom have air bags at all?? Could it be time to change the shocks & springs??

 

[jrSS]

Yea I think its time to replace shocks and springs. My envoy was off that much too..we noticed this when we lowered it.

 

[rmsg0040]

I thought these trailblazers and envoys had a lean from the factory

 

[CdnGMan]

I thought these trailblazers and envoys had a lean from the factory

Not sure of a "lean", but more of a rake... with the front being an inch or so lower than the rear... but it sounds like Voymom is talking about a side-to-side lean...

 

[rmsg0040]

thats what I meant. Side to side lean.

Google trailblazer lean, been addressed before on tbss and the os

 

[Wooluf1952]

The first two pictures are of the ABS control unit.(The EBCM= Electronic Brake Control Module)

 

[jimmyjam]

judging from your description the box is the EBC or electronic brake controller. or abs pump. whatever you want to call it

*beat me to the punch lol

 

[McGMT]

Haha, mention Bewbies and everyone forgets about the first question LOL! It is your brake controller, AKA ABS pump/manifold....


*Talk about a jinx moment. 3 in a row...

 

[Denali n DOO]

I thought these trailblazers and envoys had a lean from the factory

Ya, I think almost every Envoy I see from behind has a lean, lower on the passanger side. Even mine with the airbags has the lean. I read recently on this site that with Arnott bag replacements it levels out. Strange that so many Envoy's have that lean and I don't think it's just the ones with airbags. If you have air bags I think you can level it. If you can't raise the passanger side then lower the driver side to level. I recall a few threads on that.

 

[harmless]

Lean from factory, always passenger side.

TSB for it too, if I recall.

Search for adjusting rear bags and you can fix it yourself. It's a simple adjustment - as long as the bolts are playing nice.

 

[jrSS]

There is actually a you tube video on lowering the bags. Norcal SS (tony) did the video.

 

[Phantom]

Phantom doesn't have the air bags. so just new shocks/struts and springs?

 

[The_Roadie]

Since shocks don't affect ride height, only change them if they're old and not working well. Springs can take a set as they age or get used hard, and they're your problem.

GM was crazy when they designed a dozen different spring stiffnesses for our platform, and mixed and matched them by computer at the assembly line to make sure all the vehicles rode the same no matter what options they were built with.

 

[Sparky]

I think it isn't so much a "GMT360 lean" but rather a general GM lean. Camaros do it too, about 1/2 inch or so from the factory. Same with a few other cars. The excuse on the Camaro is that when the driver gets in the vehicle evens out. GMT? No idea why on that. My Trailblazer has a similar lean also.

Oh, and as mentioned, shocks have no effect on ride height unless they are seized up and won't compress/extend. Also as mentioned the first item is the ABS block.

 

[Voymom]

I haven't replied yet as I was out doing yard work. Anyways Thank you for letting me know that the part was ABS, I have never seen an ABS "unit" before, so I can say I learned something new today!

And as far as the lean, it is side to side not the rake from front to back that 360's have. I never recalled it leaning before, but I have never slid under the truck on that side either. No air bags, springs look to be in really good shape, still black and not rusty. My shocks...they are the factory bilstein, I don't know if they are actually the ones it had on it from factory, but they are what is usually on the trucks from factory(make sense?) The shocks all around should probably be put on the "list" of things that we need to do before it snows this year....that list is quite long too lol

ETA- Thank Sparky and Roadie for letting me know shocks have no effect on ride height, but they still need to be replaced soon

 

[jrSS]

On the side to side "lean". My SS is the same in the front on bothe sides at 32 1/2". Exact. The original owners did put on monroe struts. (Found this out while dipping my wheels)

The back I did the lowering adjustment to the bags. One side is 31 1/4" and other is 31 3/4". Not bad. If anyone knows those are a pain to adjustment. I am hapy with the result. The envoy I had on the other hand...stock height on all 4 corners were different. Up to an 1". I couldn't tell and didn't care much since I was going to lower. And yes the back of the SS sits a tad lower than the front. BUT that'll get fixed once I ge it lower to the pavement. My .02 again.

 

[Voymom]

On the side to side "lean". My SS is the same in the front on bothe sides at 32 1/2". Exact. The original owners did put on monroe struts. (Found this out while dipping my wheels)

The back I did the lowering adjustment to the bags. One side is 31 1/4" and other is 31 3/4". Not bad. If anyone knows those are a pain to adjustment. I am hapy with the result. The envoy I had on the other hand...stock height on all 4 corners were different. Up to an 1". I couldn't tell and didn't care much since I was going to lower. And yes the back of the SS sits a tad lower than the front. BUT that'll get fixed once I ge it lower to the pavement. My .02 again.

Thanks Jeff! I didn't even think to measure the back to compare to the front, but I would imagine it would be off as well. I can't tell when I'm in the truck or driving it, but I wasn't sure if it was going to lead to any issues in the future. We do plan on getting the adjustment to make the ass even with the front after October, and probably sometime next spring. I may get the parts to do it and have it put on when we get the truck painted this spring.

 

[jimmyjam]

q: how much gas was in the gas tank when you measured...

i think lack of bilateral symmetry has a lot to do with l/r lean

 

[Phantom]

q: how much gas was in the gas tank when you measured...

i think lack of bilateral symmetry has a lot to do with l/r lean

About a 1/4 tank

 

[jrSS]

That's what I was gonna ask too. But they said that the drivers side is actually higher than the pass. side.

 

[Voymom]

We can fill the tank and measure again to see if that has anything to do with it.

 

[6716]

Measurements at wheel well sheet metal straight up from center of wheel:

Before: stock at 190K
RR 33-3/4 LR 33-7/8
RF 33-1/4 LF 33

After: Monroe Sensa Trac rears, Monroe Quick Strut fronts
RR 34-1/2 LR 33-1/4
RF 33-1/4 LF 33

I kept reading shocks didn't change height, but they seemed to. And I also kept reading that the Quick struts would likely change height (at least while they "settled in"), but they didn't.

I also wonder what the springs will do when I get those in.

 

[northcreek]

I was begining to think that I was losing it since becoming aware of this leaning phenomenon.Seems that every vehicle that we have has a left or right bias.At first I attributed it to driveway pitch but,a tape tells me what most of you are saying.Since all of our vehicles are GMs I'm thinking that GM has made an allowance for lighter wallets after leaving their dealerships....just sayin'

 

[Wooluf1952]

Measurements at wheel well sheet metal straight up from center of wheel:

Before: stock at 190K
RR 33-3/4 LR 33-7/8
RF 33-1/4 LF 33

After: Monroe Sensa Trac rears, Monroe Quick Strut fronts
RR 34-1/2 LR 33-1/4
RF 33-1/4 LF 33

I kept reading shocks didn't change height, but they seemed to. And I also kept reading that the Quick struts would likely change height (at least while they "settled in"), but they didn't.

I also wonder what the springs will do when I get those in.

Some gas charged shocks do have a slight lifting effect until they get settled in.
However in your case they lifted the RR and lowered the LR.