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52 3100 Extra Crossmember #1311165
Sun May 19 2019 05:02 PM
Sun May 19 2019 05:02 PM
P
Phak1  Offline OP
Wrench Fetcher
Joined: Feb 2019
Posts: 72
Upstate NY
While looking for the source of my throwout bearing noise issue, I noticed a crossmember directly under the tail shaft of my manual 3 speed. It is not connected to the transmission as the rear mounts are on the bell housing. It is however bolted to the frame and not riveted to the frame. Looking in the assembly manual, the only crossmember is see in that position, is for an automatic transmission.

Now that’s got me thinking. I know that several parts of my truck have been replaced (the cab is originally green, the fenders originally blue and the bed is red. The engine is from a 1959 235, etc., etc...).

The bracket for the brake and clutch return springs are riveted to the frame indicating it was setup for a standard. What is that extra crossmember for?

Attached Files
Last edited by Phak1; Sun May 19 2019 05:06 PM. Reason: Added info

1952 Chevrolet 3100 w/59’ 235
Re: 52 3100 Extra Crossmember [Re: Phak1] #1311168
Sun May 19 2019 05:18 PM
Sun May 19 2019 05:18 PM
C
cmayna  Offline
Shop Shark
Joined: Jan 2002
Posts: 1,908
Menlo Park, Ca
Looks like a stock bolt on rear cross member for a SM420 gearbox.


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: 52 3100 Extra Crossmember [Re: Phak1] #1311173
Sun May 19 2019 05:44 PM
Sun May 19 2019 05:44 PM
G
Greg Brown  Offline
Wrench Fetcher
Joined: Mar 2014
Posts: 67
Bellevue, WA
There's been a lot of debate about which years/models had rear transmission supports, but since you have the cross member, it would seem your truck originally had the support. It looks like you're missing the pieces that go between that cross member and the transmission.

Attached Files

Greg Brown
'49 Chevy 3100
Re: 52 3100 Extra Crossmember [Re: Phak1] #1311178
Sun May 19 2019 07:14 PM
Sun May 19 2019 07:14 PM
tclederman  Offline
Boltergeist
Joined: Sep 2001
Posts: 27,907
Jarvisburg, NC
That frame cross member was used on all 1/2 ton trucks through 1953. I assume it was also used/needed on all sizes of trucks through 1953 (and, with 3-speed and 4-speed transmissions)?

Many people report it missing, but it was probably removed when a transmission was removed, and then not replaced.

There was no need for that rear-of-transmission cross member in 1954 with standard transmissions, because the rear engine-mount crossmember changed in 1954.

The 1954/55st Hydra-Matic transmission trucks did have a rear-of-transmission cross member, but it was only needed with the H-M transmission (and, it was bolted-on/removable).


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 50 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: 52 3100 Extra Crossmember [Re: Phak1] #1311185
Sun May 19 2019 08:15 PM
Sun May 19 2019 08:15 PM
P
Phak1  Offline OP
Wrench Fetcher
Joined: Feb 2019
Posts: 72
Upstate NY
Should I be concerned that it is not mounted to the transmission?


1952 Chevrolet 3100 w/59’ 235
Re: 52 3100 Extra Crossmember [Re: Phak1] #1311190
Sun May 19 2019 09:08 PM
Sun May 19 2019 09:08 PM
tclederman  Offline
Boltergeist
Joined: Sep 2001
Posts: 27,907
Jarvisburg, NC
I would try to find a mount (or, use the mount, if you have one).

If you need the mount, post a Parts Wanted ad.
Or, Classic Parts sells the assembly the replacement pads.
https://www.classicparts.com/searchprods.asp


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 50 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: 52 3100 Extra Crossmember [Re: Phak1] #1311200
Sun May 19 2019 10:53 PM
Sun May 19 2019 10:53 PM
P
Phak1  Offline OP
Wrench Fetcher
Joined: Feb 2019
Posts: 72
Upstate NY
Wow! I just viewed the post “Rear transmission support sm420” and this debate has been going on quite some time. It seems to me the common denominator for using this crossmember is the torque tube. I’m convinced, I need to buy and install the rear transmission mount.


1952 Chevrolet 3100 w/59’ 235
Re: 52 3100 Extra Crossmember [Re: Phak1] #1311216
Mon May 20 2019 12:41 AM
Mon May 20 2019 12:41 AM
5
52Carl  Offline
Master Gabster
Joined: Mar 2010
Posts: 7,962
Virginia
I have always wondered if that cross member was added to tame something like a vibration issue in that area caused by a less than adequate rear bellhousing mount design. This theory is strengthened due to the fact that the bolt-on crossmember was eliminated in "54 when a more stout bellhousing mount design was incorporated.
The mount on the '53 and earlier bolt-on crossmember is a flimsy affair at best. It really doesn't support much. If fact, as the small rubber pads deteriorate over time, I have never noticed any difference in operation of the trucks which I have driven.
Carl

Re: 52 3100 Extra Crossmember [Re: Phak1] #1311227
Mon May 20 2019 01:48 AM
Mon May 20 2019 01:48 AM
tclederman  Offline
Boltergeist
Joined: Sep 2001
Posts: 27,907
Jarvisburg, NC


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 50 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.

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