Body Flex - The 1947 - Present Chevrolet & GMC Truck Message Board Network

reefer55 · 11-28-2009, 09:09 PM

After replacing body mounts seems to be a lot of body flex or role in my 71 2 wd. As you drive the gap between the doors and body will get bigger and smaller as the blazer is driven. rocker boxes look to be in great shape. Little to no rust, small amount on the lower drivers door post. I used cheep Taiwan after market mount would neoprene rubber mount help. Any ideas would be appreciated.

Thanks Rick

72blue · 11-29-2009, 12:46 AM

its like an el camino lets say, the tub is long enough to need to flex like that. I have had lots of early broncos, and once I was checking the flex between the door and body with finger while driving; bad idea. Huge blood blister. The broncos would flex so much that if the doors are misaligned that they would hit the tub itself. I would say the blazer is similar. Although I use the poly mounts myself, not by choice, but they are usually easier to come by ie. energy suspension etc. Hope this helps.

vtblazer · 11-29-2009, 08:06 AM

That doesn't sound normal to me, are they torqued down correctly?

Did you do all 5 position's including the rad. core support?

Where did you purchase these mounts from?

reefer55 · 11-29-2009, 01:58 PM

Thanks guys, Yes all the mounts were replaced and they came from LMC they weren't very expensive. Over the winter up here I'm going to change them and put the good polyurethane ones on and repair the door jam.
Any help on a supplier for the good rubber mounts?

vtblazer · 11-29-2009, 02:09 PM

Going poly may not neccessarily the answer, with the correct O.E.M. style body mounts, it should be pretty stable on the road.

...course if your trying to corner like a Ferrari, that may not be the case either.

**Tom Vogel** · 11-30-2009, 10:22 AM

I can only speak for myself, (mine is 2wd). Before we removed the body, if you jacked it up uneven, you couldnt shut (or somtimes open) the doors. The body is back on the frame now, but the doors are still off until the wiring and underdash stuff is done. We put in a roll cage to lessen the twist. Of course a big motor is also the issue here.

vtblazer · 11-30-2009, 01:15 PM

Quote:

Originally Posted by Tom Vogel

I can only speak for myself, (mine is 2wd). Before we removed the body, if you jacked it up uneven, you couldnt shut (or somtimes open) the doors. The body is back on the frame now, but the doors are still off until the wiring and underdash stuff is done. We put in a roll cage to lessen the twist. Of course a big motor is also the issue here.

Thing is these frames were 'designed' to flex from the beginning, just trying to say poly mounts might not cure it...dunno.

Critter · 11-30-2009, 02:19 PM

Quote:

Originally Posted by vtblazer

Thing is these frames were 'designed' to flex from the beginning, just trying to say poly mounts might not cure it...dunno.

You bring up a question I have had for years AND it happens to pertain to this post. When these blazers were brand new from the factory, did they flex so much that the doors wouldn't open? Seams like even when someone restores one it it's still an issue at least to a degree. I have a hard time believing it was that way from day one, but maybe so. Can any of you guys that had one new back in the day shed some light on how they were 30 years ago?

cleszkie · 12-01-2009, 01:37 AM

That's probably one of the reasons that the K5 Blazer went from full convertible to a steel cab spanning the door openings after 1975 (along with the safety from roll-over issue, and top leak issues).

reefer55 · 12-01-2009, 08:23 AM

Thanks again for the replies. My nefew has a 72 2wd and his body seems to be much more stable than mine and his is all original nothing has been changed yet. I think once I get it up in the air I will loosen the top ensure the doors are aligned and re-tighten the top and than change the mounts. So can some one direct me to poly mounts?

**Tom Vogel** · 12-01-2009, 10:11 AM

Quote:

Originally Posted by reefer55

Thanks again for the replies. My nefew has a 72 2wd and his body seems to be much more stable than mine and his is all original nothing has been changed yet. I think once I get it up in the air I will loosen the top ensure the doors are aligned and re-tighten the top and than change the mounts. So can some one direct me to poly mounts?

Mine is (was) a 2wd 72 with original body mounts and a pretty rust free tub. It flexed alot as I posted... so there you go. Maybe an original owner will chime in.
Im guessing VTBlazer is right on this one... we will see I guess.

NTR72GMC · 12-01-2009, 05:02 PM

http://www.4wheelparts.com/Lift-Kits...s=20&t_pt=5582

Here is where I got mine.

11-28-2009, 09:09 PM	#1
reefer55 Registered User Join Date: Oct 2008 Location: Edmonton, alberta, canada Posts: 189	Body Flex After replacing body mounts seems to be a lot of body flex or role in my 71 2 wd. As you drive the gap between the doors and body will get bigger and smaller as the blazer is driven. rocker boxes look to be in great shape. Little to no rust, small amount on the lower drivers door post. I used cheep Taiwan after market mount would neoprene rubber mount help. Any ideas would be appreciated. Thanks Rick Last edited by reefer55; 11-28-2009 at 09:10 PM.

11-29-2009, 12:46 AM	#2
72blue Registered User Join Date: Feb 2009 Location: arroyo grande, ca Posts: 206	Re: Body Flex its like an el camino lets say, the tub is long enough to need to flex like that. I have had lots of early broncos, and once I was checking the flex between the door and body with finger while driving; bad idea. Huge blood blister. The broncos would flex so much that if the doors are misaligned that they would hit the tub itself. I would say the blazer is similar. Although I use the poly mounts myself, not by choice, but they are usually easier to come by ie. energy suspension etc. Hope this helps. __________________ James

11-29-2009, 08:06 AM	#3
vtblazer Registered User Join Date: Oct 2003 Location: Central Vermont Posts: 8,537	Re: Body Flex That doesn't sound normal to me, are they torqued down correctly? Did you do all 5 position's including the rad. core support? Where did you purchase these mounts from?

11-29-2009, 01:58 PM	#4
reefer55 Registered User Join Date: Oct 2008 Location: Edmonton, alberta, canada Posts: 189	Re: Body Flex Thanks guys, Yes all the mounts were replaced and they came from LMC they weren't very expensive. Over the winter up here I'm going to change them and put the good polyurethane ones on and repair the door jam. Any help on a supplier for the good rubber mounts?

11-29-2009, 02:09 PM	#5
vtblazer Registered User Join Date: Oct 2003 Location: Central Vermont Posts: 8,537	Re: Body Flex Going poly may not neccessarily the answer, with the correct O.E.M. style body mounts, it should be pretty stable on the road. ...course if your trying to corner like a Ferrari, that may not be the case either.

11-30-2009, 10:22 AM	#6
Tom Vogel 2WD Jimmy Join Date: Mar 2005 Location: Davis County, Utah Posts: 2,565	Re: Body Flex I can only speak for myself, (mine is 2wd). Before we removed the body, if you jacked it up uneven, you couldnt shut (or somtimes open) the doors. The body is back on the frame now, but the doors are still off until the wiring and underdash stuff is done. We put in a roll cage to lessen the twist. Of course a big motor is also the issue here.

12-01-2009, 01:37 AM	#9
cleszkie Registered User Join Date: Feb 2003 Location: Santa Ana, CA Posts: 2,191	Re: Body Flex That's probably one of the reasons that the K5 Blazer went from full convertible to a steel cab spanning the door openings after 1975 (along with the safety from roll-over issue, and top leak issues).

12-01-2009, 08:23 AM	#10
reefer55 Registered User Join Date: Oct 2008 Location: Edmonton, alberta, canada Posts: 189	Re: Body Flex Thanks again for the replies. My nefew has a 72 2wd and his body seems to be much more stable than mine and his is all original nothing has been changed yet. I think once I get it up in the air I will loosen the top ensure the doors are aligned and re-tighten the top and than change the mounts. So can some one direct me to poly mounts?

12-01-2009, 05:02 PM	#12
NTR72GMC 2wd FTW!!!! Join Date: Jan 2007 Location: SLC UTAH Posts: 673	Re: Body Flex http://www.4wheelparts.com/Lift-Kits...s=20&t_pt=5582 Here is where I got mine.



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