Body General body information and techniques for restoration, repairs, and modifications.

Is it normal for body sag when car is jacked up on all fours.

Thread Tools
 
Search this Thread
 
Old Jul 4, 2002 | 06:46 PM
  #1  
EDGE's Avatar
Thread Starter
Supreme Member
25 Year Member
 
Joined: Jan 2000
Posts: 1,199
Likes: 93
From: Mississauga, Ontario Canada
Car: 1987 GTA
Engine: 5.7
Transmission: T5WC
Axle/Gears: 3:27
Is it normal for body sag when car is jacked up on all fours.

My driver and passenger door are hard to close when the car is jacked. The stands are at the front of the frame and at the rear axel. Ive been doing heavy body work, and the car has been jacked for over a month. Is it normal for a sag that puts the drivers door out about 1/2 inch. It wont close unless I lean on the back of the door. Or I jack the car a little from the forward cross member. It worries me a little. Everything is fine when the car sits on all four tires.

Thanks
Reply
Old Jul 4, 2002 | 07:49 PM
  #2  
MikeInAZ's Avatar
Senior Member
 
Joined: Oct 1999
Posts: 735
Likes: 2
From: Portales, NM USA
Car: 86 T/A
Engine: 5.0 TPI
Transmission: 700R4
On the unibody designs, which don't have a full frame, much of the structural strength must come from the roof. Unfortunately, many of the T/A's have T tops which weaken this supporting structure.

So it is very common to get body flex. So bad sometimes that pulling up on a set of ramps may "freeze" your doors shut. This is one reason why sub frame connectors are highly recommended on the 3rd gen models.

~~~~~~~~~~~~~~~~
<FONT SIZE="2" COLOR="red">Red 86 T/A</FONT><FONT SIZE="2"> 5.0 TPI</FONT><FONT SIZE="1"> </FONT><FONT SIZE="2">(LB9/WS6)
~HyperTech Cap/Coil/Rotor/AFPR
~Derale Adjustable Fan Switch ~ 170° Stat
~Flow Matched Injectors ~ K & N Air Filter
~Ported Polished Plenum ~ Runners ~ TB
~Polished Wheels ~ Alternator - Fuel Rail
~SLP TB Airfoil ~ Pirelli 245/50/16
~All Else Stock</FONT>

<A HREF="http://www.gmtips.com/3rd-degree/"><FONT SIZE="1" FACE="MS Sans Serif"><IMG SRC="http://www.gmtips.com/3rd-degree/cg/3rd-logo.jpg" WIDTH="100" HEIGHT="80" ALIGN="BOTTOM" BORDER="0"></FONT></A>
Reply
Old Jul 4, 2002 | 08:18 PM
  #3  
EvilCartman's Avatar
Supreme Member
iTrader: (1)
 
Joined: Apr 2000
Posts: 5,321
Likes: 4
From: Northern CA.
Car: '82 Z28
Engine: 350
Transmission: TH400 4,000 stall
Axle/Gears: Currie 9", 4.56 gears
I couldn't believe the body flex I saw in my car when lowering it onto the jack stands... the body just kinda arched over. Opening the door was ok but when closing it, it would catch the rubber seal on the t-top.
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
86IROC112
Body
47
Apr 9, 2016 10:20 PM
B_Dubya
Transmissions and Drivetrain
3
Aug 26, 2015 05:09 PM
mustangman65_79
Tech / General Engine
4
Aug 8, 2015 12:07 PM
Amillionoh7
Body
2
Aug 7, 2015 01:24 PM




All times are GMT -5. The time now is 02:19 PM.