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Old October 31st, 2010, 04:03 PM   #1
1989gmc
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Default 1999 chevy soon to be coil sprung SAS

well i just traded my 1990 GMC sas for this truck. i really needed the gas mileage and reliability of the newer truck and i sure dont mind the extra power either . its a 1999 chevy silverado 1500, 5.3, auto, z71. the body is in a little rougher than i had hoped to get in a trade but i dont mind too much. the interior is super clean and has bucket seats, power everything and it all functioned properly so i couldnt pass up the deal.

when i got it it was sitting on a 6" fabtech lift and 285/75/16 tires with stock rims. also the rear was about 2" lower than the front.





well the day after i got it i sold the tires right out from under it and i had to get to detroit area the next day so i borrowed the tires off my 2002 gmc to get me down there. the tires are 35x13.5x18 pro comp xterrains. they fit pretty good with only minor trimming.







than came the shackle flip





yesturday i went to silver lake so the few days before that i had some stuff to do to get it ready to go!

it got a set of 16.5" weld racing rims from mudbilly and a set of 33's that had been taking up space in my barn, a set of fender flares, new passenger side and third door handles and a diamond plate tool box









that brings me to today. i did finally make it home last night but something still isnt right. i have a grinding noise somewhere in the front end. im sure its a cv shaft or maybe a wheel bearing but its too cold out for me to be very motivated at solving the problem.

but here is how it sits today:



future plan include:
- regear to 4.56 with rear locker
- 35-37" tires
- repair rockers and cab corners than repaint
- fix a ton of small thing from the previous owner(s) neglectiong it
- probably end up with a SAS using coils sometime in the spring

Last edited by 1989gmc; August 16th, 2011 at 01:00 AM.
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Old November 1st, 2010, 12:52 PM   #2
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well i got the day off work so ive been finishing up a bunch of little stuff on it. changed the rear gear lube and put on a chrome diff cover. had to repace both front speakers before they drove me crazy, threw on a alunimum gas door, mounted up a prerunner style push bar, but i have to pop it back off and get it painted charcoal gray to since the chrome is peeling in some spots.

also i have narrowed the front end noise down to the drivers side. seems like its a wheel bearing or a CV shaft but i havent figured it out for sure yet

Last edited by 1989gmc; November 1st, 2010 at 01:16 PM.
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Old November 1st, 2010, 02:03 PM   #3
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Intrested in how you did the shackle flip i have the same truck. how much did it lift it cause i have a rough country 6inch lift and my rear sits about 2 inchs lower too. looks really good tho.
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Old November 1st, 2010, 02:36 PM   #4
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If you do a good job you can get around 6 inchs total
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Old November 1st, 2010, 05:01 PM   #5
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Intrested in how you did the shackle flip i have the same truck. how much did it lift it cause i have a rough country 6inch lift and my rear sits about 2 inchs lower too. looks really good tho.
right now my truck sits almost perfectly level if anything about an inch high in the back and im running the shackly flip and a 3" block. the shackle flip is pretty easy and theres a few different ways to do it. i used a piece of 3" angle iron that is 3" long and 1/4" thick and than braced it with 1" wide 1/4" thick flat steel about 6" long on each side.

safety warning- *doing a shackel flip this way does take fabrication/cutting/welding and should only be done by a professional*
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Old November 1st, 2010, 05:13 PM   #6
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Old November 1st, 2010, 09:36 PM   #7
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The truck looks good with the pre runner bar on it. I was thinkin about doing an add a leaf but i dont want it to ride stiff as shit so im thinkin this is what im going to do. does it make it ride any different?
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Old November 2nd, 2010, 07:07 AM   #8
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The truck looks good with the pre runner bar on it. I was thinkin about doing an add a leaf but i dont want it to ride stiff as shit so im thinkin this is what im going to do. does it make it ride any different?
thanks! the push bar should really set it off when i get some nice lights to put on there.

if anything after the shackle flip it rides a little smoother. it changes it to a compression style shackle setup that helps the ride.

when you are doing this make sure you have enough slack in your brake lines and shocks. also when you are done you may have to get shims/wedged blocks to adjust your pinion angle. and your axle will be located about an extra 1/2"-1" forward in the wheel well when you are done. you dont really notice it unless you are looking for it. you can buy a "zerorate" to fix this or just leave it alone and it helps with driveshaft length
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Old November 2nd, 2010, 10:59 AM   #9
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right now i have a 5 inch lift block in the rear that came with the kit so i'd have to go with a 3 inch then your saying. i should have enough room with brakes and shocks if i have that big of a block in the rear now wouldn't I?
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Old November 2nd, 2010, 07:02 PM   #10
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right now i have a 5 inch lift block in the rear that came with the kit so i'd have to go with a 3 inch then your saying. i should have enough room with brakes and shocks if i have that big of a block in the rear now wouldn't I?
well if you take out the 5" block and run a shackle flip (~4") and a 2-3" block than you would end up with 6-7" of lift in the back. so you would end up needing a couple more inches of slack just to be safe. honestly it all depends on your truck the best thing you can do is measure your truck and see how it works!
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Old November 5th, 2010, 01:41 PM   #11
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well ive been doing a bunch of small stuff on it trying to fix it all up. i put the lights in the push bar and wired them in so they come on when the high beam head lights are on, fixed the broken passenger side fog light and fixed the broken tailgate handle
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Old November 10th, 2010, 05:38 PM   #12
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well it seems like i made a few steps forward and than a bunch backward. the truck got wrecked this morning in an accident with a ditch... it jumped a ditch at about 45 mph. it was foggy on the way to work and i never even saw the stop sign. the good part is i walked away with no injurys but the truck didnt do so well,

list of known damage so far:

- bent frame
- wrecked bumper
- bent fender
- bent hood
- ruined front lift bracket
- broke fog lights
- cracked front diff
- cracked skid plate
- bent push bar
- broke passenger side lower a arm
- broke passenger side upper ball joint
- bent passenger side tie rod









im picking up a new rolling frame tomorrow! so there wishould be alot of progress in the next week

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Old November 10th, 2010, 05:54 PM   #13
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thats a bummer but hey it might lead to building it bigger and better
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Old November 10th, 2010, 06:16 PM   #14
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yea if anyone knows of any of the parts that i am missing than i am interested it is my DD and must be fixed ASAP
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Old November 10th, 2010, 10:37 PM   #15
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ouch dude that sucks, hope you get teh thing rolling quick its a nice truck and nice army front plate i leave jan 26th for ft benning
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Old November 11th, 2010, 12:30 PM   #16
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Theres a salvage yard right by my house that has a hood and a passenger fender thats good no driver fender because i stole that but im pretty sure its still there if i can remember the dam name of the place ill let ya know. Man you pretty much took out the whole front end it would be easier to SAS it now lol... But good thing the ditch wasn't bigger glad to hear ya walked away from it.
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Old November 11th, 2010, 04:00 PM   #17
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Theres a salvage yard right by my house that has a hood and a passenger fender thats good no driver fender because i stole that but im pretty sure its still there if i can remember the dam name of the place ill let ya know. Man you pretty much took out the whole front end it would be easier to SAS it now lol... But good thing the ditch wasn't bigger glad to hear ya walked away from it.
x2 much easier
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Old November 11th, 2010, 05:30 PM   #18
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x2 much easier
yea its time for a 14bolt 60 combo
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Old November 11th, 2010, 07:18 PM   #19
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ouch dude that sucks, hope you get teh thing rolling quick its a nice truck and nice army front plate i leave jan 26th for ft benning
good luck at benning should be some fun! what are you going to be in the army?
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Old November 11th, 2010, 07:23 PM   #20
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Theres a salvage yard right by my house that has a hood and a passenger fender thats good no driver fender because i stole that but im pretty sure its still there if i can remember the dam name of the place ill let ya know. Man you pretty much took out the whole front end it would be easier to SAS it now lol... But good thing the ditch wasn't bigger glad to hear ya walked away from it.
that would be awesome if i coule get a new hood and a front fender for it! let me know as soon as you remember the name or atleast a location or phone number or anything of it!

i was thing about doing the SAS anyway but i really cant afford to have the truck of the road that long and i havent done enough research and parts gathering yet to pull it all off in a timely manner. so the plan as of now is to slide a new frame and front suspension parts under it. i bought a rolling frame today and shjould be able to pull the swap off in under a week and only have about $1000 into getting it back on the road so hopefully that all works out and than the SAS can happen in the spring after i have time to plan it all and gather parts
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