GM B-Body Forum, 77-79 Caprice/Impala Forum

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GM B-Body Forum, 77-79 Caprice/Impala Forum

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GM B-Body Forum, 77-79 Caprice/Impala Forum

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GM B-Body Forum, 77-79 Caprice/Impala Forum

A forum for the owners and enthusiasts of General Motors B-Bodies from 1977-1990, but dedicated to the owners of 1977-1979 Impalas and Caprices. Join up now!


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solo79
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    Post  GM B-Body Forum Sat Jul 13, 2013 4:53 pm

    http://www.clearimageautomotive.com/chevy_impala_ss_tubular_transmission_cross_members.php has crossmembers for the 91-96 models for all types of trannys. I feel one of these could work for the 77-90 models with a little modification, but im not 100% positive.
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    Post  79treemaster Mon Nov 04, 2013 12:44 am

    I gave them a call a couple weeks ago but they were not sure it would work. I will have to give them a call and ask them what the dimensions are for that crossmember.
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    Post  GM B-Body Forum Mon Nov 04, 2013 11:13 am

    i talked to Dan himself and he said it would not work, but i cant see why it wouldnt, its the exact same frame, might have to drill new holes in the frame but that aint nothing, im gonna try it one day once i get time and money to do a tranny swap, id like to get a th400 in there also
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    Post  Sweet Seventy9 Mon Nov 04, 2013 7:49 pm

    If it'll bolt into a bubble, it'll bolt into a box.

    For those that want to retain their overdrive, the TH400 and 200-4r have the same mount location.
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    Post  Sweet Seventy9 Tue Nov 05, 2013 9:39 am

    I just got a response from Crossmembers.com -

         <snip>  

    "info@crossmembers.com
           Today at 9:10 AM
    Hello Randy,
    As for the GM "B" Body, I do make a crossmember for the 77-90 models with a 700R4 or 4L60 transmission.  Same unique patented design as our popular ""G" Body crossmember, and is a direct bolt-in installation.  I currently do not have this product on my website, but it can be ordered via phone, (330-753-5300) with a visa or mastercard, or we can email a paypal invoice for additional payment methods.  My P/N is RCB3-700, and it's priced at $279.00.  S/H to most states runs around $35.00.
    Best regards,"

    Kinda price-y if you ask me....... Sad

    Anyway, I put out some feelers and found out that GM made a TON of B-body dual exhaust x-members.  They were installed on ALL 94-96 impala SS, Caprice, roadmaster, and Cadillac Fleetwood's!
    Any of those cars in the junkyard/ CL parting out ad's will have one. Only the pre-1994 cars dont have them.
    The downside is that they were only for 700r4 - 4L60Es.
    Can probably still get a few from GM too.  Sorry, I don't have a P/N yet.  I'll keep looking.

    I was just thinking about something.. We're not alone in our need for a th350 x-member.  I bet if we get some type of petition or letter of interest with bunches of willing buyers names on it and submit it to the 2 x-member makers, we could get at least one of them to make a TH350 x-member.  Hell, it's just a matter of a different mounting plate on it.
    We'd have to get people on other forums involved to increase our numbers and better our chance of having it made, but that shouldn't be a problem.

    Any thoughts??


    Last edited by Sweet Seventy9 on Tue Nov 05, 2013 10:17 am; edited 2 times in total
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    Post  79treemaster Tue Nov 05, 2013 9:44 am

    I would not think there is much difference in a 700 R4 and Turbo 350-400 trans crossmember except for relocating it on the frame.
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    Post  Sweet Seventy9 Tue Nov 05, 2013 10:28 am

    79treemaster wrote:I would not think there is much difference in a 700 R4 and  Turbo 350-400 trans crossmember except for relocating it on the frame.
    I personally have never done the swap, so I'm not positive weather it would work or not.
    Somethings telling me it won't work though or everyone would be doing it.
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    Post  hotwheelsboy28 Sat Feb 01, 2014 5:49 am

    I made my own for $91 fit like oem 400 turbo in a 80 Lesabre in the pic it wasn't finished, i put gussets on welded all the seams,cleaned and painted it, the black one is the modified 350 turbo crossmember which did not work they are positioned as they are suppose to bolt in the frame a big difference.


    https://2img.net/h/i1198.photobucket.com/albums/aa456/hotwheelsboy28/cars015.jpg
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    Post  solo79 Sat Feb 01, 2014 9:31 am

    hotwheelsboy28 wrote:I made my own for $91 fit like oem 400 turbo in a 80 Lesabre in the pic it wasn't finished, i put gussets on welded all the seams,cleaned and painted it, the black one is the modified 350 turbo crossmember which did not work they are positioned as they are suppose to bolt in the frame a big difference.


    https://2img.net/h/i1198.photobucket.com/albums/aa456/hotwheelsboy28/cars015.jpg

    Nice work on that cross member.
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    Post  Sweet Seventy9 Sat Feb 01, 2014 9:33 am

    hotwheelsboy28 wrote:I made my own for $91 fit like oem 400 turbo in a 80 Lesabre in the pic it wasn't finished, i put gussets on welded all the seams,cleaned and painted it, the black one is the modified 350 turbo crossmember which did not work they are positioned as they are suppose to bolt in the frame a big difference.


    https://2img.net/h/i1198.photobucket.com/albums/aa456/hotwheelsboy28/cars015.jpg

    That's a nice looking piece!

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    Post  GM B-Body Forum Sat Feb 01, 2014 10:05 am

    Wow that looks great, nice job on that
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    Post  hotwheelsboy28 Sat Feb 01, 2014 6:11 pm

    Thanks!
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    Post  hotwheelsboy28 Sat Feb 08, 2014 5:10 am

    I also made my own solid engine mounts for the 455 Olds, oil distiribution block for gauge and dash light and the valve cover nuts. I modified the 307 ac brackets to fit the 455 with the smaller compressor,made my own spacer washers where ever I needed them. It helps a lot being a machinist.

    https://2img.net/h/i1198.photobucket.com/albums/aa456/hotwheelsboy28/DSCN0613.jpg

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    Post  GM B-Body Forum Sun Feb 09, 2014 9:38 pm

    hotwheelsboy28 wrote:It helps a lot being a machinist.
    Yeah it sure does, done a nice job on it all, looks really really good.
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    Post  hotwheelsboy28 Tue Feb 11, 2014 12:11 am

    Thanks everyone for the coments!
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    Post  mike tanzer Mon Jul 07, 2014 5:35 pm

    im a brand new member but i am already loving this forum! iwill make that crossmember work in my 77 with a th350
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    Post  solo79 Mon Jul 07, 2014 7:04 pm

    mike tanzer wrote:im a brand new member but i am already loving this forum! iwill make that crossmember work in my 77 with a th350

    Well, we're glad to have you! Welcome aboard.
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    Post  Myloth Fri Sep 05, 2014 8:37 am

    Those are pricey thankfully I have experienced fabricator who will help with mine. But it's not

    out of the ordinary I guess for those who want bolt-on there is a stiff price to pay especially that skinny tubular

    one for 300 that's not very good seems like half thickness of a control arm tube.

    http://www.clearimageautomotive.com/images/impala_ss_cross_member_4L60E.jpg

    Going to have one made up as well straight across for duals why they made the earlier ones like they did sigh.
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    Post  Boogie1468 Thu Sep 10, 2015 4:03 pm

    The factory 94 and up trans crossmember is not a bolt-in in the 77-90 frame. The reason for this is the frame's inner rails have different brackets welded to them for the cross member mounting. However, the 94-96 factory crossmember is a two-piece stamped and welded assembly (not the one piece tubular design used in earlier models) and has designed in clearance for the left side exhaust pipe in true dual exhaust systems. This, in my opinion is worth using instead of hacking up the tubular CM, but you do have to fabricate and weld brackets to your side frame rails. Another advantage is you can then use th factory or aftermarket Pypes stainless dual system, and that makes a sweet set up.
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    Post  Pace77 Sun Sep 27, 2015 1:30 pm

    In need of a Crossmember for a 1977 B body for factory trans, but I wanna run Dual Exhaust. Help !

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