Author Topic: Transmission crossmember bolts  (Read 7173 times)

1968 Z28

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Re: Transmission crossmember bolts
« Reply #15 on: August 05, 2009, 04:35:12 AM »
Can't see the head markings but they are flanged bolts.  Check link....

http://www.ss396.com/mm5/merchant.mvc?Screen=PROD&Store_Code=camaro6769&Product_Code=BPC-7000
Jerry G.

Z28-1968-07C-Norwood
Ermine White, Red Std. Interior
2nd. Owner, 38,000 miles

68Zproject

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Re: Transmission crossmember bolts
« Reply #16 on: August 05, 2009, 07:11:15 AM »
The bolts in the link do have the 3 lines, but like you said, can't see the head.  I'll call and ask and report what I find.
68Z28

68Zproject

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Re: Transmission crossmember bolts
« Reply #17 on: November 04, 2012, 01:07:02 AM »
Like these?


1968 Z28

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Re: Transmission crossmember bolts
« Reply #18 on: November 04, 2012, 01:27:57 AM »
Like these?


Harv....mine are "A" head but don't have the little circle around the "A".

68Zproject

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Re: Transmission crossmember bolts
« Reply #19 on: November 04, 2012, 05:45:50 AM »
I know the bolt is wrong but this kind of A?


1968 Z28

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Re: Transmission crossmember bolts
« Reply #20 on: November 04, 2012, 09:10:09 PM »
Harv.....a couple of photos of my bolts showing the "A",

 

 

 

68Zproject

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Re: Transmission crossmember bolts
« Reply #21 on: November 04, 2012, 10:04:12 PM »
I looked at AMK bolts until I was cross-eyed.  Thank you much Jerry!

68camaroz28

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Re: Transmission crossmember bolts
« Reply #22 on: November 08, 2012, 03:03:30 AM »
Here is a pic of the orig. flanged bolt vs. the AMK TR replacement which is not correct in configuration as John mentioned.
Good side by side comparison with the AMK 'TR' non-flanged bolt to the right.
Chick
68 Z/28 NOR 01B Orig motor/trans/rear
69 Z/28 NOR 07A Orig Block & GM Cross-ram/carbs
69 L34 Rest. Nova Father/Son Car
69 L78 Surv Nova Purch 4/69 31K miles
67 L89 Corv Tribute
68 Corv 427/400 Orig motor
07 Corv Z06
R 68Z build- http://www.camaros.net/forums/showthread.php?t=182584

Mike S

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Re: Transmission crossmember bolts
« Reply #23 on: November 08, 2012, 01:23:13 PM »
 Why would these bolts be any different than so many others on the car as far as having different manufacturers markings?

Mike
67 LOS SS/RS L35 Hardtop - Original w/UOIT
67 NOR SS/RS L35 Convertible - Restored

lynnbilodeau

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Re: Transmission crossmember bolts
« Reply #24 on: November 08, 2012, 03:09:03 PM »
Because the flange was necessary to be able to get the bolt and nut started with a standard socket.  The bolts go in from underneath up in to a deep recess.  If you ever tried installing somthing like that without a shouldered bolt, then you know you have to stuff one or two (sometimes more depending on your socket) nuts in the socket to keep the bolt from going so far down that you can't get enough threads through the other side to get the nut started.  They couldn't just use a longer bolt, or it would have interfered with the floor of the car after install.

Mike S

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Re: Transmission crossmember bolts
« Reply #25 on: November 08, 2012, 03:41:19 PM »
 I meant more for head markings and not the style.
I would think there could be other manufacturers making the same style so the marking would be different.

Mike

JohnZ

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Re: Transmission crossmember bolts
« Reply #26 on: November 08, 2012, 04:38:53 PM »
I meant more for head markings and not the style.
I would think there could be other manufacturers making the same style so the marking would be different.

Mike

Chevrolet used at least three different suppliers for every fastener, to avoid production interruptions, and they were stocked in the plants by PART NUMBER, so the same fastener could have three (or more) different headmarks, especially between Norwood and Van Nuys; nobody in the plants paid any attention to headmarks - only part numbers.
'69 Z/28
Fathom Green
CRG

68camaroz28

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Re: Transmission crossmember bolts
« Reply #27 on: November 08, 2012, 05:04:22 PM »
I meant more for head markings and not the style.
I would think there could be other manufacturers making the same style so the marking would be different.

Mike

My point was showing an original bolt as discussed with what comes from AMK. Wrong configuration. I think the question might be for members to look at their cars and note what other shouldered bolt suppliers were used. Be good to know! Have seen the same bolt 'A' bolt on 69's as well. Do not recall anything else being used at this time but sure there has to be:)

Mike S

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Re: Transmission crossmember bolts
« Reply #28 on: November 08, 2012, 07:34:20 PM »
 I realize this topic is mainly '69 but for '67 the below picture shows a non-shoulder bolt taken from my survivor you may find of interest. This is on an L35/TH400 car.
It must have been fun installing these from the bottom up (unless they had shallow sockets) which llikely accounts for the type change in later years.

Mike