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Re: Trans cross members? [Re: oldbluetruck] #603494 Tue Dec 22 2009 06:09 PM
Joined: Sep 2001
Posts: 28,875
tclederman Offline
Boltergeist

oldbluetruck,

What year(s) are you referring to regarding 3-speed and 4-speed manual transmission rear-mounts?

The frame cross-member at the rear of the transmissions was commonly removed from 1947-1953 trucks - for more convenient removal/installation of transmissions (especially the heavy 4-speed transmission). This is probably not a good thing, if the transmission rear mount served a good purpose?

From 1947-1953, ALL 1/2 ton Chevrolet trucks (and, I think all 47-53 GMC 1/2 ton trucks) came with a cross member at the rear of the transmission (and had a mount for the rear of the transmission). This was the case for 3-speed and 4-speed manual transmissions (and for the 4-speed Hydra-Matic transmission in a 1953 GMC 1/2 ton long-bed and short-bed).

I do not know about transmission rear-mounts for 3/4 ton and larger trucks.

In 1954, the 1/2 ton frame cross-member for the rear MOTOR-mounts changed. And, the clutch housing and rear MOTOR-mounts changed. This stronger mounting-arrangement from 1954 onwards resulted in no need for a manual-transmission rear mount (or for a frame cross-member for the TRANSMISSION rear-mount) - this was the case for both 3-speed and 4-speed manual transmissions (on the 1/2 ton - I do not know about the 3/4 ton).

In 1954, the new Hydra-Matic transmission (on a Chevrolet truck) was used with a frame that had two different cross-members than was used on other 1/2 ton 1954 frames: (1) the rear MOTOR-mount cross-member was different (different from earlier years and different for other 1954 1/2 frames); and, (2) a frame cross-member and a TRANSMISSION-mount were at the rear of the massive Hydra-Matic transmission.


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 48 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 14 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- 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 engine are not "splash oilers" - this is a splash oiler.
Re: Trans cross members? [Re: tclederman] #603515 Tue Dec 22 2009 07:42 PM
Joined: Jan 2004
Posts: 222
N
Nifty 50 Offline
Shop Shark
I can only speak from my own experience with a '50 3100 4 speed. It did have a rear tranny cross member, but it also had a torque tube rear end that I believe was the basis for the rear cross member. In about 1978 I replaced the rear end with an open drive line and ditched the cross member. In 30 years I have not had any problems here. I will let you know if I do in the future.


1950 Chevy 3100
261, 4 speed
Purchased 1977

1964 Pontiac Lemans Convert
Re: Trans cross members? [Re: Nifty 50] #603539 Tue Dec 22 2009 08:58 PM
Joined: Jan 2002
Posts: 2,404
O
oldbluetruck Offline
Shop Shark
I have a 53 3100. When I dragged it home it had the tranny cross member and the 3 speed on the column. The transmission was in the truck on the floor. The support plate was also in the truck but the rubber pad is gone. I am not sure if this is repairable or if I need to buy a new one. I am converting it to a 4 on the floor because that is what I want. And will keep the enclosed driveshaft.

So, I should use the cross member when I put the truck back together? Will I need to purchase a new support plate?

TIA


Dennis
-there is nothing stronger than the heart of a volunteer-
Re: Trans cross members? [Re: oldbluetruck] #603592 Tue Dec 22 2009 11:39 PM
Joined: Sep 2001
Posts: 28,875
tclederman Offline
Boltergeist

I would use a rear transmission mount, as was originally installed.

Pad for rear transmission mount (if you have the metal parts, you should be able to use what you have).

If your rear transmission mount cannot be repaired.

It's been a while since I had a truck with a mount (I now have only '54s), so I do not know if both rubber pads are used.


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 48 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 14 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- 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 engine are not "splash oilers" - this is a splash oiler.
Re: Trans cross members? [Re: tclederman] #603597 Tue Dec 22 2009 11:47 PM
Joined: May 2006
Posts: 8,490
L
LONGBOX55 Offline
Master Gabster
All the 3800 AD trucks I've ever been under did not have a crossmember or rear trans mount. I'm inclined to think the rear mount might have more to do with the torque tube than the trans itself.


Bill Burmeister
Re: Trans cross members? [Re: LONGBOX55] #603628 Wed Dec 23 2009 01:41 AM
Joined: Mar 2004
Posts: 877
G
Ghostrider Offline
Shop Shark
Originally Posted by LONGBOX55
All the 3800 AD trucks I've ever been under did not have a crossmember or rear trans mount. I'm inclined to think the rear mount might have more to do with the torque tube than the trans itself.


I agree...neither my 3600 (3 speed) or my 3800 (4 speed) has a trans crossmember.

Re: Trans cross members? [Re: Ghostrider] #603647 Wed Dec 23 2009 02:37 AM
Joined: Sep 2001
Posts: 28,875
tclederman Offline
Boltergeist

Most likely the stronger engine mount cross member made a rear transmission mount unnecessary in larger trucks. That cross member was beefed up in 1954 1/2 ton trucks.


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 48 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 14 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- 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 engine are not "splash oilers" - this is a splash oiler.
Re: Trans cross members? [Re: tclederman] #603654 Wed Dec 23 2009 02:52 AM
Joined: Jan 2002
Posts: 2,404
O
oldbluetruck Offline
Shop Shark
You are exactly right. That is the crossmember and mount. I do have the mount and need the pads you attached. Thank you


Dennis
-there is nothing stronger than the heart of a volunteer-
Re: Trans cross members? [Re: oldbluetruck] #603659 Wed Dec 23 2009 03:09 AM
Joined: Mar 2009
Posts: 786
P
padresag Offline
Shop Shark
here is a hydramatic out of a 55 that was behind a 235 and there was no facility for a rear mount
http://yfrog.com/12dscn2074lj
sorry forgot to add the link before
ron

Last edited by padresag; Wed Dec 23 2009 05:43 AM.
Re: Trans cross members? [Re: padresag] #603674 Wed Dec 23 2009 03:59 AM
Joined: Dec 2005
Posts: 2,576
B
bowtietim Offline
Shop Shark
My 1951 3100 Chevy had the crossmember under the three speed.I modified it to fit my T-5.

My 1951 3100 Chevy suburban with 4 speed has the same crossmember .


"A house is built with boards and beams,a home is built with love and dreams"

Look deep before you leep !!!

"Everything is Everything"

"If I say a mouse can pull a house,Hitch him up"

My 1951 3100 Chevrolet
My 1951 Chevrolet Suburban Carryall

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