Author Topic: 69 Center axle bumper - two styles?  (Read 8468 times)

Dave69x33

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69 Center axle bumper - two styles?
« on: May 17, 2008, 03:42:30 PM »
During the 69 model run, there were two different style center axle bumpers, one retained with screws to the bottom of the chassis, the other a pushed in style. 

Was the push in style a 68 carry over and used on early 69's?

My May "05A" Norwood car has the push in style.  The 69 AIM, UPC section 4, page 59 shows that the documentation was updated on 8-29-68 to include screw #3958062, and changed the bumper from #3923564 to bumper asm #3962763.

Can someone confirm the changeover date?  Does anyone have their original screw in style bumpers?  If so, what is your build date and could you please post a picture of the bumper?

Thanks.

 

KevinW

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Re: 69 Center axle bumper - two styles?
« Reply #1 on: May 19, 2008, 11:45:01 AM »
I am curious about this too!  My June 69 leftover SS Van Nuys had the plate (missing the bumper), but my Oct 68 norwood had the push in kind (cant tell if it was replaced)

L78 steve

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Re: 69 Center axle bumper - two styles?
« Reply #2 on: May 22, 2008, 04:50:52 PM »
My 04C has the push in style .
69 Z/28 Dover White. SOLD
67 SS/RS Mt. Green 1W,2LGSR,3SL,4K,5BY,07C. SOLD
70 Nova L78 Blk. Cherry,Sandalwood,M21,02B

Dave69x33

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Re: 69 Center axle bumper - two styles?
« Reply #3 on: May 22, 2008, 10:31:35 PM »
Thanks KevinW and L78 Steve,

So far it appears that we have documenation updates in late 1968, an Oct 68 Norwood, April '69 (plant?) and May '69 Norwood car with push-in styles, and a June '69 LA car with the screw on style axle bumper.

Anyone else with their original bumpers?

Dave69x33

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Re: 69 Center axle bumper - two styles?
« Reply #4 on: December 31, 2023, 08:21:20 PM »
I would revisit this topic I originally posted it back in 2008.

Since 2008, CRG has added a section dedicated to original and unrestored Camaros so hopefully feedback from the owners of those Camaro can comment and hopefully show photos! 

With your feedback we need to know the plant and build date of your car. Your VIN will also help more closely determine when the change took place.

Question: Is it known when the center rear axle bumper changed from the push in style to the bolted in style on the ‘69?

I saw in the ‘69 AIM, section 4, page 59 assembly manual, an engineering change dated 8-29-68, where the center bumper changed from the push in style 3923564to the bolt on style 3962763.

My July 1969 GM Parts Catalog, “Group 5.395 Bumper, Rear Axle Pinion,” calls for screw in type 3962763 for “1969/ALL” along with this note: “When used in place of a push in CN bumper it will necessary to drill two 9/32 holes, using bumper as a template, and attach with 5/16-18 tap screws.”  It also calls for screw 3958062 which is a self tapping screw.

When I posted on this question on CRG back in 2008, I got two responses. An 04C ‘69 had a push in style, my 45k mile 05A Norwood build N639712 ‘69 had the original push in style still on the car when I started my restoration. One other ‘69 Camaro owner responded with a ‘69 June car from Van Nuys had the bolt in style.  I recently discovered on CRG the low mileage LeMans Blue X77 Z28 survivor, late build 10E Norwood car had the screw in center axle bumper.

All told, based on the GM documentation dates and this very small (4) sampling of ‘69s, it appears the change phased in between mid-May and June 1969.

Can anyone with an unrestored survivor, or documented original restored ‘69, share on this topic?

The photo attached is from the 10E blue survivor.

I’ll start photo documenting this anytime a see a ‘69 survivor!

Happy New Years!

Dave

Dave69x33

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Re: 69 Center axle bumper - two styles?
« Reply #5 on: December 31, 2023, 08:34:29 PM »
Here is snap shot of the info from the GM Parts Catalog, Group 5.395 Bumper, Rear Axle Pinion.

Dave69x33

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Re: 69 Center axle bumper - two styles?
« Reply #6 on: December 31, 2023, 08:43:23 PM »
And... a full view of the factory assembly manual page 59 highlighting the engineering change I mentioned regarding the change to the center axle bumper.

RikerZ28

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Re: 69 Center axle bumper - two styles?
« Reply #7 on: December 31, 2023, 09:30:08 PM »
I just checked my 69 NOR 02D and it has a push in bumper. Looks to be original as it looks like its 55 years old.
1969 Z/28 02D X-33 / L72

Iowa Jon

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Re: 69 Center axle bumper - two styles?
« Reply #8 on: December 31, 2023, 09:34:32 PM »
Hi Dave,  my 05A Norwood X77 has the push in style.

Jon

Dave69x33

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Re: 69 Center axle bumper - two styles?
« Reply #9 on: December 31, 2023, 09:47:49 PM »
Thanks Jon!

We need to compare notes as my X33 Z28 is an 05A!

Iowa Jon

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Re: 69 Center axle bumper - two styles?
« Reply #10 on: December 31, 2023, 09:51:18 PM »
Hi Dave,  after posting I took a look at pictures from another Camaro  I owned back in 2003. 1969 Camaro Norwood built X11  01B.  Pictures look like it is a push in.  I only have pictures of the top side with the floor cut out.  I may have some underside pictures.  If you want to see the pictures email me.   

R68GTO

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Re: 69 Center axle bumper - two styles?
« Reply #11 on: December 31, 2023, 10:08:11 PM »
My 09D (late) Norwood has the holes for the screw in style but had a push in style installed when I took it apart for restoration.  Every bumper on the car was original when I took it apart.  This one ws one of the few on the car I couldn't save - it was rock hard and had to be destroyed to get it out.
1969 427 COPO Camaro Lemans Blue/Black, M22 4 speed, 15,500 original miles

Dave69x33

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Re: 69 Center axle bumper - two styles?
« Reply #12 on: January 01, 2024, 12:08:12 AM »
Interesting R69GTO! Thanks.

Dave69x33

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Re: 69 Center axle bumper - two styles?
« Reply #13 on: January 01, 2024, 12:43:47 AM »
RikerZ28…thank you for your response.

R69GTO, forgot to mention that my car also had the two holes for the screw in style but had the push in style snubber. During my restoration I looked closely at the holes and there was no evidence they were ever tapped for the screw in style.

So far, this is what we have, NW = Norwood, VN = Van Nuys:

01B, NW, push in
02D, NW, push in
04C, plant? push in
June, VN, bolt in
05A, NW, push in
05A, NW, push in
09D, NW, push in

Let’s keep in going!

x66 714

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Re: 69 Center axle bumper - two styles?
« Reply #14 on: January 01, 2024, 01:03:59 AM »
Norwood, 08E of 1969, push in....Joe
See America's First, Chevrolet

1968 Z/28 Corvette Bronze. Black Hounds Tooth. 02E Los Angeles born 3/13/1968 pnt OO. Purchased March 1976
1969 SS396 Yellow/Yellow 08E Norwood born 8/28/1969 pnt 76E. Purchased April 1981

 

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