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Does 4speed have a cross member support?
#12486 Mon Sep 23 2002 07:01 PM
Joined: Mar 2002
Posts: 384
S
Shop Shark
I want to put a 4 speed with granny in my 55.1. I have a 3 speed lite duty in it now. There is no cross member support for my 3 speed tranny. Was there a support for the heavier 4 speed? Is it a cross member or some other sort of bracket? Thanks - Scott


55 1st Chev.
Re: Does 4speed have a cross member support?
#12487 Mon Sep 23 2002 07:19 PM
Joined: Jan 2001
Posts: 687
F
Shop Shark
scott you musta been reading my mind. I was about to post the exact same question. My 66 has the 3 speed/no support in it and I'm going to a significantly larger MY6/89MM 4 speed and wondered if I needed a crossmember.

I think I'm going to be on the safe side and buy one I saw at Golden State parts for 50 bucks. It can only help.

I don't think you can go wrong if you go ahead and get one for your 4 speed. Overkill at best.

-ftyler

Re: Does 4speed have a cross member support?
#12488 Mon Sep 23 2002 08:00 PM
Joined: Feb 2001
Posts: 1,904
M
Member
Yes, if it is more securely mounted, it will make the whole assembly stronger. cool


There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
-
-
Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!
Re: Does 4speed have a cross member support?
#12489 Mon Sep 23 2002 10:29 PM
Joined: Sep 2001
Posts: 30,431
ace skiver
There was no rear support in 54/55-st for the 1/2 ton truck transmission (unless you had a HydraMatic transmission). The motor mounts and the frame crossbrace for the motor mounts changed in 1954, supposedly making the rear mount for the 3-sp and 4-sp transmission unnecessary.

I have never had one on my 1/2-ton '54 pickup and it had a 4-sp on it from the factory (no holes in the steering column for the 3-sp shifter box).

Tim


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: Does 4speed have a cross member support?
#12490 Tue Sep 24 2002 12:58 AM
Joined: Apr 2000
Posts: 58
J
Member
Not sure what you figure to accomplish by using a crossmember with a trans that has no mount for bolting it to.

Re: Does 4speed have a cross member support?
#12491 Tue Sep 24 2002 07:12 AM
Joined: Feb 2001
Posts: 1,904
M
Member
.


There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
-
-
Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!
Re: Does 4speed have a cross member support?
#12492 Tue Sep 24 2002 07:29 PM
Joined: May 2001
Posts: 13
R
Junior Member
I REPLACED THE 3 SPD TRANNY IN MY 53 W/ A SAGINAW
4 SPD OUT OF AN 82 PONTIAC FIREBIRD AND FABRICATED
A TRANNY X-MEMBER FOR IT BY USING A 1 1/2" SQUARE
TUBING AND BOLTED IT IN USING #8 NUTS AND BOLTS
JUST TO BE ON THE SAFE SIDE...ALOHA

Re: Does 4speed have a cross member support?
#12493 Wed Sep 25 2002 07:03 PM
Joined: Mar 2002
Posts: 384
S
Shop Shark
tclederman, or anyone else....What are the proper numbers for the 4 spd original tranny type? The junk yard needs to know. Also any installation tips would be helpful. - Thanks for all replies!


55 1st Chev.
Re: Does 4speed have a cross member support?
#12494 Thu Sep 26 2002 01:58 AM
Joined: Apr 2000
Posts: 487
R
Shop Shark
SM420
[img]http://www.jeeptech.com/convtrans/sm420/4202.jpg[/img] [img]http://www.jeeptech.com/convtrans/sm420/4205.jpg[/img]

The pictures came from these guys. http://www.jeeptech.com/convtrans/gm/gmsm420id.html
This page will tell you a little more about the trans.
http://www.novak-adapt.com/knowledge/sm420.htm
If you want to go to the later SM465 like I did, you have to change bellhousing.
You can see it is as Jack said about the mount.


'67 GMC 3/4 292 4spd
Re: Does 4speed have a cross member support?
#12495 Thu Sep 26 2002 03:38 PM
Joined: Mar 2002
Posts: 384
S
Shop Shark
Wow!!!That is more than I could have hoped for....
Thanks much Richard!


55 1st Chev.
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