Offroad Trailblazers and Envoys

Factory Spring Part Numbers & Associated Lift

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

by Anthony Hernandez » Thu Jan 07, 2016 3:19 pm

I like the 89/z71 combo
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by navigator » Thu Jan 07, 2016 4:50 pm

There has been at least one member that sheared the top of their shock off running 89s, with Mark's 3" kit with no bumper.
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by mason10198 » Thu Jan 07, 2016 5:24 pm

Well, thats definitely no bueno. I just looked at Anthonys thread and it says he cut down his 89s one coil. I kindof like that idea. How does that sound?
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by mason10198 » Thu Jan 07, 2016 5:30 pm

or, keep my rear 2" spacer, replace the front 3" spacers with 2.5in ones, and then put 89s on that? or 88s? gosh I don't have enough experience with this.

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by Anthony Hernandez » Thu Jan 07, 2016 5:47 pm

The 2.5" w/89 combo def works, v7guy and tarsh both run it, the difference seems to be the .50" which is why with the help of James's input I decided to go ahead and cut a coil off to see if it helped.. Only time will tell if it works or not...
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by TBYODA » Thu Jan 07, 2016 6:08 pm

Do not run the 3" lift and the 89. V7guy (Jason) IIRC blew 3-4 HD struts on NYS pot hole roads (BTW he had a steel front bumper then also). He even tried a few different things to get around the issue but still blew the struts. Trash did not head our warnings and also blew out a strut/s and is now running the 2.5' lift. This is why you don't see to many members running the 89 unless they have the 2.5" lift. On Jason envoy he is running the 2.5" lift and 89 with good success as Anthony stated. Many have had success with 87 & 88 and the 3" lift. JD ran the BDS 2" lift and 87 for many years with out issues. Since you have the 3" lift already just get the springs.
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by mason10198 » Thu Jan 07, 2016 7:14 pm

Well that pretty much sums it up. Thanks for the info yoda. I'll probably pair that bumper with either 87s or 88s down the road.
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by Cable810 » Sat Jan 09, 2016 11:45 pm

I would just go with 88s been proven very successful with Mikes bumpers.
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by LSfan70s » Mon May 02, 2016 9:56 am

Need a bit of help with this matter.
I got a 2006 TB LS with front springs part number: 15125881, the softest ones.
I just finished swapping a LQ9 engine in it (6.0L V8 iron block), and now it's siting a bit lower in the front, also it dives too much when braking, and the sun visor covers the whole visibility field when lowered. Total PITA!

Can someone suggest any specific spring part number for me to get normal riding height? Thanks.
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by Rickalicka18 » Mon May 02, 2016 10:45 am

If you have z71s in the back I would do either 87 or 88s. But you mentioned bringing it back to stock height so 86s may be what your looking for. I believe there was an equation that showed how much lift you would get from each spring, if you want to fine tune the ride height.

I currently have 87s with just the 4.2 up front and it rides pretty smooth. I won't go any stiffer though, I actually might swap the 87s for 86s if I go through another cv shaft in a month though...
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by LSfan70s » Mon May 02, 2016 12:26 pm

Rickalicka18 wrote:If you have z71s in the back I would do either 87 or 88s. But you mentioned bringing it back to stock height so 86s may be what your looking for. I believe there was an equation that showed how much lift you would get from each spring, if you want to fine tune the ride height.

I currently have 87s with just the 4.2 up front and it rides pretty smooth. I won't go any stiffer though, I actually might swap the 87s for 86s if I go through another cv shaft in a month though...

Thank you Rick :thumright:
I will try finding a set of 86s or 87s. Unless you have a spare for sale :mrgreen:
I have no idea what I have on the back.
Not sure if the equation applies to my case, since my springs are already compressed by the extra weight of the heavier engine.
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by HawkeyeC25 » Mon May 02, 2016 12:38 pm

I have a set of '85's that were stock from my '05 EXT with the 5.3L V8. I'll sell them for $20 + shipping if you are interested. OR, if you want they are currently installed with MarkMC's 3" leveling kit and brand new KYB shocks. I'll sell the pair of them completely assembled for $100 + shipping.
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by LSfan70s » Mon May 02, 2016 1:10 pm

HawkeyeC25 wrote:I have a set of '85's that were stock from my '05 EXT with the 5.3L V8. I'll sell them for $20 + shipping if you are interested. OR, if you want they are currently installed with MarkMC's 3" leveling kit and brand new KYB shocks. I'll sell the pair of them completely assembled for $100 + shipping.

Yes I want those springs. PM sent.
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by Rickalicka18 » Mon May 02, 2016 1:18 pm

LSfan70s wrote:
Rickalicka18 wrote:If you have z71s in the back I would do either 87 or 88s. But you mentioned bringing it back to stock height so 86s may be what your looking for. I believe there was an equation that showed how much lift you would get from each spring, if you want to fine tune the ride height.

I currently have 87s with just the 4.2 up front and it rides pretty smooth. I won't go any stiffer though, I actually might swap the 87s for 86s if I go through another cv shaft in a month though...

Thank you Rick :thumright:
I will try finding a set of 86s or 87s. Unless you have a spare for sale :mrgreen:
I have no idea what I have on the back.
Not sure if the equation applies to my case, since my springs are already compressed by the extra weight of the heavier engine.


No problem man! I wouldn't think the difference with the heavier engine would be too much... Maybe think of an 86 spring with your engine being the same compressed height as someone with the 4.2 and 85 springs. It'll atleast give you a good idea of how much lift you'd get from each spring. And if I do blow another cv shaft, then I'd be glad to sell you my 87s, but other than that I have no spares...
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by LSfan70s » Mon May 02, 2016 1:26 pm

Rickalicka18 wrote:
LSfan70s wrote:
Rickalicka18 wrote:If you have z71s in the back I would do either 87 or 88s. But you mentioned bringing it back to stock height so 86s may be what your looking for. I believe there was an equation that showed how much lift you would get from each spring, if you want to fine tune the ride height.

I currently have 87s with just the 4.2 up front and it rides pretty smooth. I won't go any stiffer though, I actually might swap the 87s for 86s if I go through another cv shaft in a month though...

Thank you Rick :thumright:
I will try finding a set of 86s or 87s. Unless you have a spare for sale :mrgreen:
I have no idea what I have on the back.
Not sure if the equation applies to my case, since my springs are already compressed by the extra weight of the heavier engine.


No problem man! I wouldn't think the difference with the heavier engine would be too much... Maybe think of an 86 spring with your engine being the same compressed height as someone with the 4.2 and 85 springs. It'll atleast give you a good idea of how much lift you'd get from each spring. And if I do blow another cv shaft, then I'd be glad to sell you my 87s, but other than that I have no spares...

Awesome! Blow that shaft! JK :P
I'll give it a try to those 85 from HawkeyeC25 by the moment.
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by Rickalicka18 » Mon May 02, 2016 3:06 pm

Hahahaha, I hope it lasts man. Just curious, are you running all stock suspension?
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by LSfan70s » Mon May 02, 2016 3:55 pm

Rickalicka18 wrote:Hahahaha, I hope it lasts man. Just curious, are you running all stock suspension?

Me? Yes I am. Just going thought the debugging of the swap.
Than comes the lift :flex dirty:
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by Rickalicka18 » Mon May 02, 2016 5:18 pm

Ahhh I see. Make sure you take pictures!
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by LSfan70s » Tue May 03, 2016 12:00 pm

I found this other part number: 15780415. Seems to be for the SSs.
Does anyone has any input about those?
I guess they are shorter than the ones for non SS.
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by Rickalicka18 » Tue May 03, 2016 12:20 pm

Might be a lowering spring?
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