FAQ |
Members List |
Social Groups |
Calendar |
Search |
Today's Posts |
#1
|
|||
|
|||
Body sag
Has anyone experienced a body sag when the car is on front jack stands to where the doors will not open freely? My '64 GTO has this problem and I not sure if it's something that can be fixed or if it's life with an old car.
__________________
Vince Walburn 1964 Pontiac GTO Retired USAF SMSGT. 1983-2015 |
#2
|
||||
|
||||
They all do that, once you start supporting that frame and body structure by points on the frame instead of the car sitting on the suspension it’s a normal occurrence.
Same thing but worse with a convertible car, I can’t get the doors open on my Le Mans if I support it under the front frame rails and at the rear suspension mount area. Even that heavy duty boxed frame can’t stop the flexing. Hardtop cars are worse than post cars in this regard as well.
__________________
1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
#3
|
|||
|
|||
I had the same problem with my 1965 GTO when it was only 4 years old. I think all the hard tops did it including the "B" bodies.
|
#4
|
||||
|
||||
My father-in-law was an engineer at AO Smith in Milwaukee, where most GM frames were built until the 1970's. He said that the movement or twist on a typical automobile from one corner to the opposite is about 4" as the car travels along a road.
Yes, it's normal for your '64 GTO and all other cars & trucks to deflect noticeably when jacked up by the frame. Watch the wings on the airplane next time you take a flight. Also, be aware that the windshield and rear window glass play a significant role in keeping the body from flexing. Using butyl tape to secure these windows leaves you with much more flexing. Most auto glass shops will not use butyl tape, but insist on urethane adhesive.
__________________
BONESTOCK GOATS '64 GTO Tripower Hardtop (Wife's Car) '64 GTO Tripower Post Coupe (My Car) '99 Bonneville SE Sedan Last edited by Dick Boneske; 04-15-2023 at 01:32 PM. |
The Following User Says Thank You to Dick Boneske For This Useful Post: | ||
#5
|
||||
|
||||
I have a problem with body sag too.
Oh wait, you guys are talking about cars!
__________________
My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic. |
#6
|
||||
|
||||
LMFAO
|
#7
|
||||
|
||||
I think a lot of it happens from driving over time as well my RAIV w 15k on it is very tight. Jack it up and there’s no flex to the body, never had subframe connectors. I’ve done the same w other birds (I’ve had 21 of them) and had much more flex.
The RAIV car jacks up tight like my turbo car w a 10 pt cage and subframe connectors. It does have alluminum body bushings though and that does help but this is more about twist or sag in the body itself My convertible on the lift w subframe connectors I can’t open the doors not that you should anyway.
__________________
Happiness is just a turbocharger away! 960 HP @ 11 psi, 9.70 at 146. Iron heads, iron stock 2 bolt block , stock crank, 9 years haven't even changed a spark plug! selling turbos and turbo related parts since 2005! |
#8
|
||||
|
||||
Poly body bushings help a noticeable amount if you care to use them instead of rubber.
__________________
The '64 GTO The '65 Chevelle The '69 Chevy Pickup Project The Brazen Orange 2006 GTO |
#9
|
|||
|
|||
I don't think age has a lot to do with it. Those early hard tops are very flexible. Like I said earlier my car was only 4 years old at the time and did it.
|
#10
|
||||
|
||||
Noticed the flex my 65, so while the car was apart for a refresh I boxed the frame. Before it went back togther found a convertable frame so switched every thing over to that frame and is under the car now. Not done yet but expect an improvement. 1966 you could order a heavy duty frame (convert) option on a hardtop.
|
#11
|
||||
|
||||
Quote:
__________________
The '64 GTO The '65 Chevelle The '69 Chevy Pickup Project The Brazen Orange 2006 GTO |
#12
|
|||
|
|||
Quote:
I recall with 68 FB convert I was driving down a smooth road and felt the door gap changing. I have not tried that with my Tempest Convertible. |
#13
|
|||
|
|||
NOW THATS FUNNY 1111 LOL
|
Reply |
|
|