Offroad Trailblazers and Envoys

Review my Build Plans?

BDS, ReadyLift, Smaxx... You name it, we know about it here.

by connorwallin » Wed Dec 06, 2017 2:13 pm

My plan is to do a 2-2.5" inch lift on my 07 Trailblazer with 240,000 miles. Heres what I have so far from researching.

SUSPENSION LIFT

BDS'S Suspension Lift or Liftmeister 2.5"

ALTERNATIVE SPRINGS

Rear: Z71 Suspension Setup

Now my questions for this is, if I do the Z71 Suspension for the rear, say I go for Liftmeister 2.5" lift setup, do I need to put the lift spacer/block in the rear with the Z71 or does the Z71 lift the truck up itself matching with the front height? Also, where would I purchase the Z71 Suspension?

SHOCKS

Front: Bilstein HD Shocks

Rear: Bildstein HD (If I don't go the Z71 route)

TIRES AND RIMS

Rims: stock for now, will upgrade later down the line. will keep 17-inch size.

Tires: BFGoodrich KO2's 265/70/17

OVERALL AND REVIEW

How does this all look? Anything I'm missing or not understanding? I would like to have more appearance aspect to the truck by not doing any crazy lift or tires. I'm inspiring my build a lot from snowblazer.
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by TBYODA » Thu Dec 07, 2017 2:21 am

The lift kits come with a 2” rear spring spacer. So either way using stock springs or upgrade to z71 your gonna need a longer rear shock. I would recommend a bilstein 33-185552. You can get them on amazon for $74 each on prime. If your front springs are original I suggest new ones maybe something a little stiffer. See the moog spring thread since the GM springs are hit or miss getting them
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by TBYODA » Thu Dec 07, 2017 2:33 am

Also don’t forget the armor oil skid plate and radiator skid plate. see our MDB fab in our vendor section.
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by Trail X » Thu Dec 07, 2017 9:12 am

Lift block + springs in the rear. It may feel high in the rear at first, but the Z71 springs do settle. If you don't like it, its not that difficult to take the lift blocks back out - not like the front.

Buy the Z71 rear springs on ebay: https://www.ebay.com/p/Tahoe-Rear-15234 ... /655264827
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by connorwallin » Thu Dec 07, 2017 2:12 pm

Trail X wrote:Lift block + springs in the rear. It may feel high in the rear at first, but the Z71 springs do settle. If you don't like it, its not that difficult to take the lift blocks back out - not like the front.

Buy the Z71 rear springs on ebay: https://www.ebay.com/p/Tahoe-Rear-15234 ... /655264827


Will having the Z71 springs + the 2.5-inch block make the truck sit unevenly with 2.5" in the front?
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by mason10198 » Thu Dec 07, 2017 2:26 pm

The trucks are already nosedived a little straight from the factory, but yes, Z71s will add like another 2 inches on top of the lift block. Like JD said, if you decide you can't handle it after they settle down you can always pop the spacers out real quick. Easy, just jack it up until the axle hangs and maybe take out shock bolts if you have to.

I have Z71s and 2" blocks in the back and '87s with 3" blocks in the front, and if I took my winch bumper off the front it would probably sit darn near level.

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by Trail X » Thu Dec 07, 2017 2:46 pm

Image

This is a comparison between a stock truck and a 2" BDS lift (front and rear), Z71 rear springs, and 32" tires. The rake isn't objectionable, even before the springs settle.
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by Strizay » Sun Jan 14, 2018 12:23 am

connorwallin wrote:
Rear: Z71 Suspension Setup

Now my questions for this is, if I do the Z71 Suspension for the rear, say I go for Liftmeister 2.5" lift setup, do I need to put the lift spacer/block in the rear with the Z71 or does the Z71 lift the truck up itself matching with the front height?.


with the Z71 springs and let's just use Skyjacker N8030s for example, that would give a 2.5" total lift in the rear right, so you wouldn't need a lift block if 2.5" is the lift you want? So all you would need to level would be a 2.5" level block in the front, is that correct? You can tell I have never done this before, complete Noob.
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by djthumper » Sun Jan 14, 2018 1:06 am

Z71 spring only lift about 1.5"
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by Strizay » Sun Jan 14, 2018 1:55 am

but isn't there already an inch difference from the back to the front stock? So if you take that stock 1" and add the spring 1.5", that's where I'm stuck. There is an inch difference in rear height to the front though right?
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by Trail X » Mon Jan 15, 2018 12:43 am

Sounds about right. If you need more, you can always add more. The rear is fairly quick to add to once you've done it.
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by Strizay » Mon Jan 15, 2018 8:37 pm

Trail X wrote:Sounds about right. If you need more, you can always add more. The rear is fairly quick to add to once you've done it.


Thank you for the solid reply, I appreciate it. So I'm just going to do a 2.5" lift block on the front, new shocks and Tahoe springs on the rear. That would make me high enough to run a set of BFG Mud-Terrain T/A KM LT255/75R17 right? Thank you for the solid yes or no answer, that's what I've been waiting to hear. Everyone has a bunch of different combinations of builds, but I don't think I've read any that are exactly like what I want to do.
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by Trail X » Sun Jan 21, 2018 1:01 am

Suspension wise, yes. Just be sure you're also doing something about the backspacing. You can only go up to a 30.5" diameter tire unless you do something to reduce the backspacing.
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by norwelder » Sat Jan 27, 2018 2:13 am

Trial X. when you say you have to have backspacing if you go above 30.5 tires. Are you saying the height will hit the upper ball joint or is the real need is to have at least 1-1/2 inch spacers to get the tire away from the inner fender wells so when you turn you would minimize rubbing and cutting? I’m getting ready to buy -12 wheels with 285 70 17 tires. I think I have this calculate I will have a 1/4 to 3/8 verticle measurements away from tire and upper ball joint. I have a 2 inch front only BDS LIFT which in reality it only lifted it 1.5 inches.
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by norwelder » Mon Jan 29, 2018 8:48 pm

Gents
I have fished around the site for some time. I hope I can get some rock solids answers. I currently have 50mm offset stock wheels. After my 2 inch BDS front lift which in reality was 1.5. My ball jiont is one inch higher than my tire and one inch overlapping the tire. I want 285 70 17 tires and 17x9 wheels. Stock wheels are 7 wide. I have use a couple tire calculators. Is there anybody running offsets of -12 to get the clearance? If so what is space between the tire and the ball joint. I see a lot of TBers with the 1.5 spacer and stock wheels. I want to eliminate the spacers. 50mm is about 2inch offset to get back to zero. So if Buy -12 Im at 2.5. If the math dictates I go 1-1/2 inch wide to miss the ball joint. What do i really need with 285-75 17 tires. What is killing me wheel selection. I’m really just interest in —12 wheel tbers.
Last edited by Trail X on Tue Jan 30, 2018 11:36 am, edited 1 time in total.
Reason: Merged into your other thread
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by Trail X » Tue Jan 30, 2018 10:40 am

Its to miss the upper ball joint. Less backspacing actually makes interference with the fender wells worse, but it does help with interference with the frame rails. Its a tight rope. If you get it right, you can have 33" tires that haven't required cutting of the fenders, don't hit the upper ball joint, and don't rub the frame, but its a squeese.
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by norwelder » Thu Feb 01, 2018 11:51 am

Trail X wrote:Its to miss the upper ball joint. Less backspacing actually makes interference with the fender wells worse, but it does help with interference with the frame rails. Its a tight rope. If you get it right, you can have 33" tires that haven't required cutting of the fenders, don't hit the upper ball joint, and don't rub the frame, but its a squeese.


Well I bought Moto Metal wheels blanks from Custom offset, they are going to drill them. The Moto Metals are -12 17x9 backspacing 4.5. My stock are 17x7 with 6 inch back spacing +51mm, so if my math is correct this will give me the 1 1/2 inch needed to get around the knuckle. I went with 285/70-17 BF Goodrich tires also. So I’m going all the way. These Tires and wheels move the stock outside side wall out 2 7/8 inches.
https://tiresize.com/calculator/ Anyway I used this calculator. Crossing my fingers
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by Trail X » Tue Feb 06, 2018 1:08 pm

Sounds correct. Can't wait to see them. Just out of curiosity, are you sticking with stock diff gearing? Which gears do you have? Generally 3.42 gears are not recommended with anything larger than 32". This is a good reference: http://offroadtb.com/diff-gear-ratio-calculator/
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