Question about BB 4speed crossmember

[Ohio427]

I forgot to ask. Does the same BB 4 speed crossmember fit all three years 1967-1969?

[acelr8]

The two humps also start out wider and end up narrower.The bb exhaust is wider than the small block at the front.Hard to explain but side by side is obvious.Jeff

[Nova Research Project]

Ohio427;

I have sb and bb crossmember pictures on my site on a transmission crossmember identification page. The focus is the Nova, but they used the same sub frame. It does not go into differences (if any) by year, but provides a way to see the crossmembers side by side.

The pictures are right under the transmission code table on this page: Nova Crossmember Identification

Greg R.

[nuch_ss396]

Greg,

That's top-notch documentation you have on that site.

As the saying goes, a picture is worth a thousand words.

Steve

[YENKO DEUCE REGISTRY]

There is a 1/2" offset towards the passenger's side on the BB Xmember. You can use SB engine mounts with a BB Xmember, you just have to muscle the tail of the trans over to get the bolts to line up. Every 4speed Yenko Deuce was built this way!

[Z28DZ]

[ QUOTE ]
I forgot to ask. Does the same BB 4 speed crossmember fit all three years 1967-1969?

[/ QUOTE ]

To the best of my knowledge, yes.

Ed

[Ohio427]

Greg, great site you have there. The pictures tell me what I wanted to know. The picture of the SB crossmember is exactly like mine. It shows the bolt holes to the right of the opening. I just don't understand how mine bolted up with BB engine mounts and SB Xmember. Do you guys think that I should replace the SB with a BB xmember. I worry now that with this combination that I am putting undue stress on some part of the drivetrain whether it be the rear end, transmision or engine itself. It just seems like something has to be taking the force of the 1/2". I have put over 500 miles on this setup and haven't noticed anything unusual like an engine or drivetrain noise or vibration.

[YENKO DEUCE REGISTRY]

Your setup is fine, there are deuces with 100k+ miles on them with the mis-matched components - without problems! The universal joints make up for any alignment issues. I'm not sure I'd be throwing a set of slicks & caltracs on there, but for 'normal' usage it will be ok.

[Ohio427]

Marlin, Thank you. That's what I have been wanting to hear. I'd hate to go through changing anything when everything runs well as is. With my luck, the new & right crossmember would probably not line up while I had no problems with the wrong Xmember. I was just afraid of something developing in the future because of this. This site is truely a treasure of knowledge. Thanks to all.

[NCGuy68]

Good info here Gents on a much over-looked topic. Allow me to add a little more:

The OEM shifter mounting holes are different relative to the tranny mounting holes on big block xmembers. They are offset to the left about 1/4" compared to SB. This allows the BB shifter linkage to align correctly. Yes, a mismatch will work, but thats not the way they were from the factory.

This applys only to 67-8 Camaros.