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Re: Rear transmission support sm420
sstock #1286635 Thu Nov 08 2018 10:41 PM
Joined: Sep 2001
Posts: 30,580
ace skiver
Originally Posted by sstock
It is omitted for some reason in the manual but nevertheless it does exist. Here is a picture of a 52 survivor truck that just underwent a cab off. Seem to remember GMC used a longer bed on their 1/2 tons and had a carrier being didnt they?

GMC had a "long bed" 1/2 ton model (Chevrolet did not).
GMC had an "extension joint" to extend the enclosed driveshaft.


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: Rear transmission support sm420
Snowman51 #1286650 Fri Nov 09 2018 12:28 AM
Joined: Jan 2013
Posts: 1,663
S
Shop Shark
Tim, I seem to remember that picture maybe 6 months back on here. Did it still had the transmission crossmember and mount plate?


1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
https://www.youtube.com/watch?v=Bli...n05i04t1aokgm4p04jiwgffwhyyih5xbk0h00410
1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration
Re: Rear transmission support sm420
Snowman51 #1286655 Fri Nov 09 2018 01:01 AM
Joined: Sep 2001
Posts: 30,580
ace skiver
I do not know about the cross-member mount plate.

this illustration shows some sort of plate


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: Rear transmission support sm420
Snowman51 #1286660 Fri Nov 09 2018 01:19 AM
Joined: Jan 2002
Posts: 2,106
C
Shop Shark
Per the following link, you can see in the 5th pic, the cross member support plate.

sm420 support


Last edited by cmayna; Tue Nov 13 2018 03:23 PM.

Craig's '50 Chevy 3100 5 window
My truck
If I'm not working on my truck or VW camper, I'm fishing with the wife or smoking Salmon.
Re: Rear transmission support sm420
tclederman #1286669 Fri Nov 09 2018 01:36 AM
Joined: Jan 2013
Posts: 1,663
S
Shop Shark
Originally Posted by tclederman
I do not know about the cross-member mount plate.

this illustration shows some sort of plate

Looks like it has four drilled holes for the cross member Tim


1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
https://www.youtube.com/watch?v=Bli...n05i04t1aokgm4p04jiwgffwhyyih5xbk0h00410
1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration
Re: Rear transmission support sm420
Snowman51 #1287877 Sat Nov 17 2018 09:06 PM
Joined: Jun 2012
Posts: 1,729
S
Shop Shark
Bigger trucks (over 3/4 ton) had a supported carrier bearing. Needed for the longer bed and longer drive shaft. The torque tube needed some support and on the short bed trucks that was the cross member behind the trans mission. With out it some whip forces would only have the rubber in the rear axle to spring mount for control. The bigger trucks had the carrier bearing and a 2 piece drive shaft. and a cross member to suport it. You do have to be able to remove the support and cross member if you want to service the torque tube. The E brake set up (drum on the drive shaft) was also supported. The SM420 transmission will have either the torque tube bell end or the flat end with a seal depending on the driveshaft used. Those will interchange by the way.Older torque tube to a newer transmission? no problem. Just swap the bell end for the flat one and you are good to go. Older transmission to newer drive shaft? Again, no problem. Just swap the plate for the bell and you are good too. The output yoke matches the bell(torque tube) or it matches the the open drive shaft. I keep them together for each application. Does the length of the drive shaft matter? Probably. But the drive shaft in the Emissions cheating "heavy Half ton is a long one with no carrier bearing. Late 70s maybe. Keep the mount and the cross member. The Engineer had this discussion with the Accountant already. The Engineer won.


Steve H
Re: Rear transmission support sm420
Snowman51 #1287880 Sat Nov 17 2018 09:18 PM
Joined: Jan 2013
Posts: 1,663
S
Shop Shark
I like the way you put things Steve.
Steve


1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
https://www.youtube.com/watch?v=Bli...n05i04t1aokgm4p04jiwgffwhyyih5xbk0h00410
1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration
Re: Rear transmission support sm420
Snowman51 #1287924 Sun Nov 18 2018 01:47 AM
Joined: Sep 2018
Posts: 86
W
Shop Shark
FYI, here,s my survivor 48-3609 heavy 3/4. I'm doing a clutch job on it. Prior to those new mounts the bellhousing was setting on the frame.... making getting the clutch and p-plate impossible to get out. I had to jack up the back of the engine about a inch to remove the parts. With the trans out it was then easy to put new mounts in. This truck is the 125" w-base flatbed, with the short carrier bearing drive shaft.

Attached Files
DSC02258.JPG (280.2 KB, 164 downloads)
Last edited by wrenchguy; Sun Nov 18 2018 01:48 AM.
Re: Rear transmission support sm420
Snowman51 #1287987 Sun Nov 18 2018 07:36 PM
Joined: Jan 2016
Posts: 575
S
Shop Shark
Wrenchguy..........what does the rear transmission cross member look like if it has one ?

Re: Rear transmission support sm420
Snowman51 #1288002 Sun Nov 18 2018 11:16 PM
Joined: Jan 2013
Posts: 1,663
S
Shop Shark
Here is a look at one, the torque tube drive shaft is resting on it. Dont have a pic of it removed.
Steve

Attached Files
IMG_0170.jpg (53.46 KB, 133 downloads)

1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
https://www.youtube.com/watch?v=Bli...n05i04t1aokgm4p04jiwgffwhyyih5xbk0h00410
1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration
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