Author Topic: Transmission crossmember bolts  (Read 7388 times)

sixt9x33rs

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Transmission crossmember bolts
« on: February 15, 2009, 03:29:42 PM »
I think I know the answer to this but just to confirm, don't the cross member bolts have the threads up? Otherwise you could not move the cross member with the body on?

Thanks guys
'69 RS Z/28 Olympic Gold, 711
Flat hood no spoiler, black top, endura, 4:10
POP 39,000
69 X77 Z/28 69 711 Original Paint Unrestored
'69 X66 Convertible Cortez Silver 712 black top Endura, auto, bumper guards, am/fm rear speaker 44k miles

HOGDADDY

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Re: Transmission crossmember bolts
« Reply #1 on: February 16, 2009, 09:22:54 PM »
I am gonna say the bolts go up because thats the way mine is presently and I honestly believe (can't confirm) the crossmember has never been removed. In fact I even left it in place while I blasted/painted the frame. However I am missing one of the 4 bolts/nuts  :(.

gro51

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Re: Transmission crossmember bolts
« Reply #2 on: February 17, 2009, 01:16:32 AM »
Yes!  The bolts go up from the bottom.  Threads on top.
Joe
Schodack, NY

'68 SS/RS 350, M21, 3:73, Rallye Green, Black Deluxe Interior

sixt9x33rs

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Re: Transmission crossmember bolts
« Reply #3 on: February 19, 2009, 02:24:17 AM »
Thanks guys.
'69 RS Z/28 Olympic Gold, 711
Flat hood no spoiler, black top, endura, 4:10
POP 39,000
69 X77 Z/28 69 711 Original Paint Unrestored
'69 X66 Convertible Cortez Silver 712 black top Endura, auto, bumper guards, am/fm rear speaker 44k miles

68Zproject

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Re: Transmission crossmember bolts
« Reply #4 on: June 23, 2009, 09:18:43 PM »
Anyone know what these bolts are?  Thread pitch, size, finish, headmark, washer size and finish?  Thanks.
68Z28

jl8dale

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Re: Transmission crossmember bolts
« Reply #5 on: June 24, 2009, 02:06:15 AM »
Here's a pic of an original. You can get a functional bolt w/built in washer at Ace Hardware. It won't have the head markings but will work just fine. I think it is a 3/8" x 16 x 1 1/2.
1969 Z/28 Daytona Yellow/Yellow Houndstooth, Tilt, Fold Down Seat, - POP
1969 Pace Car Original & Highly Optioned - Chassis Broadcast Sheet

john302

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Re: Transmission crossmember bolts
« Reply #6 on: June 24, 2009, 02:48:12 AM »
The bolts have a flanged head with the letter A and three lines.Also they take thick washers and locks on one side and only locks on the other.Very few four speed cars still have the correct bolts and washers. My original 07c 68z never had the cross member removed and this is what I found.  John Allouez Restorations

1968RSZ28

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Re: Transmission crossmember bolts
« Reply #7 on: June 24, 2009, 04:37:19 AM »

68Zproject

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Re: Transmission crossmember bolts
« Reply #8 on: June 24, 2009, 07:01:45 AM »
AMK has lots of those A headed bolts and I'm sure they have these.  If I have part #'s (which I can't find in the AIM) I could order from them as I'm putting together one already.  That picture looks like the tansmisson mounting bolts.  I'm looking for the crossmember ones that bolt it to the subframe.  If some one knew what size and length they were I could match them up.  I would probably need the size of the washers as well.
68Z28

1968RSZ28

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Re: Transmission crossmember bolts
« Reply #9 on: June 24, 2009, 08:18:23 AM »
I'm looking for the crossmember ones that bolt it to the subframe.  If some one knew what size and length they were I could match them up.  I would probably need the size of the washers as well.

Those are the bolts I referenced above...

Heartbeat City sells a kit...  http://store.heartbeatcity.net/store/product/17722/Cross-member-mounting-kit/

The kit includes the washers and nuts too.  Just $6.95!

Paul

68Zproject

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Re: Transmission crossmember bolts
« Reply #10 on: June 24, 2009, 03:59:26 PM »
No, I knew you  and John had it right, I was just referencing the picture and that it looked like the tranny bolts.  I appreciate you getting me the link for HBC, but the reason I was trying to get the part # and use AMK was I'm getting eaten allive by shipping.  I have an order to put in to AMK and to add a few bolts won't change shipping.  I ordered some motor mounts and forgot the bolts.  Bolts cost $4.00- shipping for two bolts-$9.50 and it's adding up real quick.
68Z28

1968RSZ28

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Re: Transmission crossmember bolts
« Reply #11 on: June 24, 2009, 04:57:18 PM »
No problem.  I thought you missed my post...    :)

Paul

john302

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Re: Transmission crossmember bolts
« Reply #12 on: June 24, 2009, 10:08:27 PM »
The bolts from AMK are not correct.They would be ok for a restored driver,but not a judged show car. Is the car going to be judged?   John Allouez Restorations

68Zproject

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Re: Transmission crossmember bolts
« Reply #13 on: June 24, 2009, 11:58:14 PM »
Is the car going to be judged?   John Allouez Restorations

Hopefully, some day.  If AMK is not correct, are the ones HBC sells correct, or does he get them from AMK?
68Z28

68Zproject

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Re: Transmission crossmember bolts
« Reply #14 on: August 04, 2009, 10:48:02 PM »
Crossmember bolt kit from HBC doesn't have flanged heads and are TR headmarked.
68Z28

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?

68Z28

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".
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 #19 on: November 04, 2012, 05:45:50 AM »
I know the bolt is wrong but this kind of A?

68Z28

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",

 

 

 
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 #21 on: November 04, 2012, 10:04:12 PM »
I looked at AMK bolts until I was cross-eyed.  Thank you much Jerry!
68Z28

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

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:)
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 #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
67 LOS SS/RS L35 Hardtop - Original w/UOIT
67 NOR SS/RS L35 Convertible - Restored