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  1. #1

    Exclamation How to I remove rusted Cab mount bolts to install a body lift?

    I have a 88 gmc sierra. I want to install a body lift my self but i am afraid that i will brake the bolts off. has anyone did this there selfs. Any help would be apprieciated.

  2. #2
    Master Mechanic silverhobey's Avatar
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    Oct 2010
    Cobourg, Ontario, Canada
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    I removed my cab mount bolts to install side steps on our 1 year old Crew Cab. GM now uses thread lock/sealer,
    but I don't know about older will probably need an air compressor and an impact gun.

    Good luck in your venture ................Brian
    Silverado Crew.....4.8 L

    ---Pendaliner BoxLiner and Side Rails....Van and Truck World
    ---Reese Adjustable Step Down Trailer Hitch....Van and Truck World
    ---PUTCO chrome eyebrow Mirror Covers.... Van and Truck World
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    ---DeeZee TailGate Assist ....Van and Truck World ( now Action Car and Truck Accessories )

    ---Westin Series side steps....Apple Auto Glass
    ---TRIFOLD rear soft Tonneau....Apple Auto Glass

    ---Chevrolet Bowtie Mudflaps...GM Dealer
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    ---GM Front Black Tow Hooks w Hloks
    ---GM Chrome Tailgate Handle/matching key-lock....GM Dealer
    ---GM Driver Information Center Upgrade...GM Dealer
    ---GM Front Tinted Bug Deflector...GM Dealer
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    ---Better Built rear hitch step .... Lowe's !!!
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  3. #3


    where your bolts rusted on at all

  4. #4
    Sr. Mechanic
    Join Date
    Oct 2011
    Salt Lake City, UT


    Don't know on an '88-but on the new ones GM sent out a TSB to all aftermarket suppliers to include instructions NOT TO USE AN AIR IMPACT WRENCH. As stated, they use a lock tight product and the body bolts that the body mount screws up in to are welded and have been known to break off. When this happens you need to cut a hole in the floor of the cab to repair that particular one.

  5. #5


    Nice GM does it again
    2010 Chevy Silverado Z71 ext cab.4x4
    72 Monte Carlo 350-415 hp- sold (June 2011) to pay medical bills
    79 Impala 350 4bbl 375 hp- sold (June 2011)to pay medical bills

    "If He asks you to go a mile go two"

  6. #6
    Master Mechanic Jimmeh's Avatar
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    Apr 2009
    Columbia Falls, Montana, United States
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    yeah, don't use an impact. Spray your rusted bolts down with a penetrating solution (there are a ton of different kinds out there, so use at your discretion), wait, and then breaker bar and some swearing should get them off without breaking them. I haven't installed a body lift before, but I have had to remove some cab bolts before, so that's what I did.
    2005 Chevy Silverado W/T
    4X4|4.8 with some mods (has only slightly more pull than a 5.3)|Auto|4 door ex cab|Cooper Discoverer AT/3's in 285-75/17's on Helo 842's|Cooper Discover M+S 265-75/17's on Devino DV349's|Flowmaster 40 Single in Dual out with custom bent pipe from the end of the cats back|2" Procomp leveling kit|Custom made center console|Custom dyno tunes|Air Raid CAI|Air Raid Throttle Body Spacer|Apex brand topper|Kenwood Head Unit with Kenwood speakers|Painted mirrors/grille|Debadged except front emblem|Bilsteins front and rear
    Planned mods not in order
    2 inch lift|Custom front/rear bumper|hitch tire carrier|roof basket on topper, bars on cab|finish center console build|install Midland CB|Power options|Tint|Custom made raised bed in the bed of the truck|Lund LunarVisor
    Also have a 1992 Ford Ranger with a lot of stuff done to it. Currently waiting for a bit of a rebuild.

    "The only woman I'm pimping from now on is Sweet Lady Propane. And I'm tricking her out all over this town."

  7. #7


    when i did my 3 inch i soaked everything in pb blaster. and when i ran out i used some liquid wrench squirted on them. i used a regular 1/2 inch drive socket wrench. inspect how much rust there is first. soak em good. when you get a cheater bar/breaker bar on em. as you turn it when you THINK your losening. stop immediately to make sure its not twisting a bolt in two. if not carry on. my .02 cents for yah.

  8. #8
    Master Mechanic silverhobey's Avatar
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    Oct 2010
    Cobourg, Ontario, Canada
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    no, our truck was pretty much brand new, so I don't know what kind of reaction rust has done
    to yours ...................Brian

  9. #9


    is wd 40 good enough to use on the bolts

  10. #10


    I have restored (body off) two cars with lots of rust issues. You do NOT want to use an air wrench or any high torque to try to remove the bolts.

    If there is threadlocker, the toughest grade will loosen its grip if you heat it to 400 degrees. Use a heat gun (preferably the non flame type) and try to gently loosen bolt or nut.

    If this does not work, then go buy at an industrial fastener supplier some penetrating oil called "Aerokroil". Orange spray can. After two car restorations and many, many cars worked on, this stuff will penetrate the worst rust if you leave it on long enough, such as 24 or more hours. Tap with a small hammer while applying the wrench to loosen.

    If the bolt breaks, which occasionally cannot be avoided if the metal has fused, you have to drill out the stud and re-tap the threads. Sorry, but I have had to do this many times on older cars, and the two I restored. Part of the deal when you work with frozen bolts and nuts.

    If it is a nut, you can carefully drill two holes next to each other from the top of the perimeter of the nut, then take a small chisel, tap the nut apart and remove it from the unmolested threads of the bolt. Tedious, but it works. If you damage the threads on the bolt, it can be replaced. Just make sure it is a grade 5 or 8 bolt. Just make sure you get the same grade nut.
    Last edited by The Heater; 03-02-2012 at 09:30 PM.
    1994 Chevy K2500 Silverado, 454 (modified), original owner.
    And other vehicles and toys.

    "...If you can meet with triumph and disaster
    And treat those two imposters just the same;'ll be a Man, my son!" Rudyard Kipling

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