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Username Post: Tranny to crossmember        (Topic#347754)
Frankman 
Gold Supporting Member
Posts: 48
Frankman
Reg: 09-25-17
10-18-17 09:23 PM - Post#2711326    

On my 55 chevy convertible to put a 700r4, I can see I have to put a crossmember to support the tranny, do I need additional brackets to attach the tranny to the crossmember. I don't see any place to bolt to any where behind the oil pan.



 

Bad56Sedan 
"11th Year" Gold Supporting Member
Posts: 854
Bad56Sedan
Loc: Pasadena, Texas
Reg: 04-29-04
10-19-17 04:34 AM - Post#2711341    
    In response to Frankman

"do I need additional brackets to attach the tranny to the crossmember."
You need the rubber GM style mount between the cross member and the trans.


I don't see any place to bolt to any where behind the oil pan.
What are you needing to bolt?

VC56S 2 door Sedan, 37 Years

[image]http://chevytalk.org/sm/3564.jpg[/image]


 
Henrys57wagon 
Canadian Regional Coordinator &"12th Year" Silver Supporting Member
Posts: 3164
Henrys57wagon
Age: 68
Loc: Carleton Place ON, Canada
Reg: 04-15-06
10-19-17 05:04 AM - Post#2711346    
    In response to Bad56Sedan

here is a link to the crossmember.
https://www.ebay.ca/sch/i.html?_sacat=0&_nkw=5...

57 B/A wagon, 408"BB with 14' Bonair travel trailer,71 Nova 355"SB, 07 2500HD with 26 Prowler 5th wheel, 09 Impala LT, John Deere lawn tractor,
http://www.picturetrail.com/sfx/album/listing/use r...


 
Rick_L 
Honored Member
Posts: 27249
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
10-19-17 09:27 AM - Post#2711364    
    In response to Frankman

Henry's link is to an Ebay page with lots of crossmembers. I see only 2 crossmembers for convertibles, either should work. Some of the other crossmembers shown show the rubber/metal mount used between the trans and crossmember.

There are two tapped holes to the rear of the pan where the rubber/metal mount is fastened. You can get the rubber/metal mount at any auto supply. Just ask for one for a vehicle that came with a 700-R4.



 
Frankman 
Gold Supporting Member
Posts: 48
Frankman
Reg: 09-25-17
10-19-17 01:02 PM - Post#2711386    
    In response to Bad56Sedan

It's not so much that I need, I just thought the tranny bolted to the crossmember. Thanks for your response.



 
57tim 
Valued Contributor
Posts: 2988
57tim
Loc: Cameron, Wi, USA
Reg: 11-09-01
10-19-17 04:49 PM - Post#2711419    
    In response to Frankman

You may or may not "need" the mount but there is a lot of weight hanging off the back of the engine and an aluminum torque housing.

57 Bel Air 2dr Ht
327 700r4
http://www.picturetrail.com/tmneid


 
asbicca 
"8th Year" Silver Supporting Member
Posts: 212
asbicca
Loc: Southern California
Reg: 07-18-03
10-26-17 08:58 PM - Post#2712306    
    In response to 57tim



This crossmember is from William Classic Chassis in La Verne, CA.
It will work with just about any modern trans, auto or manual, if positioned correctly.
What you see here is a 200R4 which is similar in length to a turbo 350.

http://s2.photobucket.com/albums/y40/asbicca/55 %20...


 
Bluemeany 
Senior Member
Posts: 810
Bluemeany
Loc: Santa Clara, CA
Reg: 05-31-02
10-27-17 08:36 AM - Post#2712350    
    In response to asbicca

A long time ago I was approaching a stop sign at a high rate of speed with drum brakes. Went from 3rd to 2nd and popped the clutch. Broke the bell housing, completely broke off one of the transmission mounts, and cracked the transmission body. Had it towed to a local garage only to endure the laughter and embarrassment.
Although I had a manual tranny, the same forces are in play with an auto. My suggestion is to have a crossmember. Got mine from American Power Train. I don't have a picture installed in my car but this is from their website:

57 Hardtop 302 & 3 Speed stick w/OD;
93 Camaro Indy Pace Car


Edited by Bluemeany on 10-27-17 08:42 AM. Reason for edit: No reason given.

 
FINMAN 
Frequent Contributor
Posts: 1321

Loc: Burlington , Mass
Reg: 03-01-05
10-28-17 06:31 AM - Post#2712447    
    In response to Bluemeany

You'll need to be using engine side mounts to use a rear crossmember



Edited by FINMAN on 10-28-17 06:32 AM. Reason for edit: No reason given.

 
Bad56Sedan 
"11th Year" Gold Supporting Member
Posts: 854
Bad56Sedan
Loc: Pasadena, Texas
Reg: 04-29-04
10-28-17 03:29 PM - Post#2712485    
    In response to FINMAN


Why would you need to swap to side mounts when adding a rear trans crossmember?

VC56S 2 door Sedan, 37 Years

[image]http://chevytalk.org/sm/3564.jpg[/image]


 
57tim 
Valued Contributor
Posts: 2988
57tim
Loc: Cameron, Wi, USA
Reg: 11-09-01
10-28-17 05:08 PM - Post#2712494    
    In response to Bad56Sedan

You don't. If you have mid mounts then you don't have bellhousing mounts and need a trans mount.

If you have front mounts you need bellhousing mounts and can have a trans mount if you wish but it is not mandatory. Most have it for little extra peace of mind.

57 Bel Air 2dr Ht
327 700r4
http://www.picturetrail.com/tmneid


 
Frankman 
Gold Supporting Member
Posts: 48
Frankman
Reg: 09-25-17
10-29-17 06:51 PM - Post#2712632    
    In response to 57tim

Thanks for the response guys, I am definitely putting a crossmember under the tranny. Those cross members you posted would not work as my project is a 55convertible. But thanks for your input.



 
FINMAN 
Frequent Contributor
Posts: 1321

Loc: Burlington , Mass
Reg: 03-01-05
10-29-17 07:18 PM - Post#2712639    
    In response to Frankman

Here is what a convertible frame uses for the trans cross member

https://www.performanceonline.com/1955-57-CHEVY-BE...






 
Frankman 
Gold Supporting Member
Posts: 48
Frankman
Reg: 09-25-17
11-13-17 04:06 PM - Post#2714279    
    In response to FINMAN

Ok thank you for your help.



 
CharlieC 
Senior Member
Posts: 1828
CharlieC
Loc: Flower Mound, TX,
Reg: 03-27-02
11-23-17 09:51 PM - Post#2715534    
    In response to Frankman

To fill-in a few blanks... The original tranny mounts went to the side of the frame off of each side of the transmission, there was no side to side mount across the middle of the frame.

Convertibles have the large x-member unique to them, where you cannot use the side-to-side mounts folks were posting pics of.

I believe you can continue to use the side-mounts with the 700 if you really wanted to, the mount Finman posted will make things a good bit easier.

Charlie

"Yeah, I'm just going to clean it up and make it a driver." May 2002

'57 BelAir Conv. GMPP LSX/L92-440 T-56 (almost...)
'74 K5 Blazer 4x4
'14 Ram 2500 Diesel MegaCab 4x4


 
56sedandelivery 
Dedicated Enthusiast
Posts: 5242
56sedandelivery
Age: 66
Loc: Everett, Wa.
Reg: 02-26-08
11-24-17 01:19 AM - Post#2715545    
    In response to CharlieC

700R4 mounting point is "further back" than ALL the other modern aluminum automatic transmissions; not sure if the TH400 is the same or not. The shorter frame mount is used, and bolts into the convertible X frame; those holes needed will have to be drilled. Any rubber mount that fits should work, although you may need to drilled one hole in the new cross-member IF a single bolt/nut is used to bolt the rubber mount to the new cross-member (asome have a single bolt, most have 2).
I am Butch/56sedandelivery.




 
Frankman 
Gold Supporting Member
Posts: 48
Frankman
Reg: 09-25-17
11-25-17 04:46 PM - Post#2715718    
    In response to 56sedandelivery

Thanks for your response guy's.



 

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