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G3GM 1973 to 1977 A-bodys. Chevelles, Monte Carlos, El Caminos, Laguna, 442, Cutlass, Malibu, GTO, LeMans, Century, Regal, Grand Am, Grand Prix, Sprint, Gran Sport, Can Am, Hurst-olds, and other 73-77 A-bodies


Buick vs Chevy Dual Humps

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Post by Mcarlo77 Wed May 30, 2012 9:50 pm

For those of you who can't sleep at night wondering about the differences between these two styles of crossmembers...I pulled a '73 Buick Regal dual hump crossmember the other day and thought I'd compare it to a '73 Chevelle dual hump ( I don't have a life!). Both are off a TH350. It's a mystery to me why the two GM Divisions used different style crossmembers, but here's what I learned:

1) Overall length is the same (52 1/2")
2) Ctr-to-ctr distance of mtg holes are the same (51")
3) Buick weighs 16 1/2 lbs vs Chevy at 19 3/4 lbs

Does anyone know for sure if these fit the TH400?

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Post by 1973 454 MONTE Wed May 30, 2012 10:02 pm

my 73 monte is a factory 400 trans car. i have a 350 turbo in it now,all i had to do was move C/M to another set of holes already there. Very Happy

i have the top member in mine
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Post by Mcarlo77 Wed May 30, 2012 10:17 pm

So, the mounting pad between the crossmember and tranny must be the same, also?
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Post by Limey SE Wed May 30, 2012 10:27 pm

Dont know if they fit the 400 or not but I do know I need that Buick one LOL
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Post by 1973 454 MONTE Thu May 31, 2012 9:59 am

I used the same mount off the 400 on the 350.
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Post by Mcarlo77 Thu May 31, 2012 10:50 am

Awesome...thanks for the info!

Oh, and Limey...this one was pulled for a guy who owns a '76 Regal and is serving in Afghanistan until Aug. Sorry...
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Post by Limey SE Thu May 31, 2012 3:49 pm

arrrrrgggg OK also Pm me your address to square up what I owe ya Steve I cant find it ??
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Post by oldstofty Thu May 31, 2012 8:23 pm

Bottom ones in my cutlass
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Post by pila Fri Jun 01, 2012 1:43 am

With all the extra holes in the frame, the cross member on a Chevy will fit the TH400 OK by moving it to fit. I have a '73 cross member in the '75 Elco, with a 400 trans......

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