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52 3100 Extra Crossmember #1311165 Sun May 19 2019 05:02 PM
Joined: Feb 2019
Posts: 141
P
Phak1 Offline OP
Shop Shark
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 & hydraulic lifters
Original “Three on the Tree” & 4:11 torque tube
12v w/ Alternator
Re: 52 3100 Extra Crossmember [Re: Phak1] #1311168 Sun May 19 2019 05:18 PM
Joined: Jan 2002
Posts: 1,951
C
cmayna Online
Shop Shark
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
Joined: Mar 2014
Posts: 79
G
Greg Brown Offline
Shop Shark
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
WP_20181102_11_58_34_Pro.jpg (38.72 KB, 82 downloads)
WP_20181102_11_58_29_Pro.jpg (64.9 KB, 82 downloads)

Greg Brown
'49 Chevy 3100
Re: 52 3100 Extra Crossmember [Re: Phak1] #1311178 Sun May 19 2019 07:14 PM
Joined: Sep 2001
Posts: 28,313
tclederman Online
Boltergeist
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 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: 52 3100 Extra Crossmember [Re: Phak1] #1311185 Sun May 19 2019 08:15 PM
Joined: Feb 2019
Posts: 141
P
Phak1 Offline OP
Shop Shark
Should I be concerned that it is not mounted to the transmission?


1952 Chevrolet 3100 w/59’ 235 & hydraulic lifters
Original “Three on the Tree” & 4:11 torque tube
12v w/ Alternator
Re: 52 3100 Extra Crossmember [Re: Phak1] #1311190 Sun May 19 2019 09:08 PM
Joined: Sep 2001
Posts: 28,313
tclederman Online
Boltergeist
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 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: 52 3100 Extra Crossmember [Re: Phak1] #1311200 Sun May 19 2019 10:53 PM
Joined: Feb 2019
Posts: 141
P
Phak1 Offline OP
Shop Shark
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 & hydraulic lifters
Original “Three on the Tree” & 4:11 torque tube
12v w/ Alternator
Re: 52 3100 Extra Crossmember [Re: Phak1] #1311216 Mon May 20 2019 12:41 AM
Joined: Mar 2010
Posts: 8,196
5
52Carl Offline
Master Gabster
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
Joined: Sep 2001
Posts: 28,313
tclederman Online
Boltergeist


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.

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