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Re: Output yoke for closed drive sm420 [Re: yellosub54] #1250790
Sat Jan 13 2018 04:28 PM
Sat Jan 13 2018 04:28 PM
S
sstock  Online
Shop Shark
Joined: Jan 2013
Posts: 910
Gig Harbor, WA
I see you want the entire assembly. Use the ujoint and outer yoke from the 3sp and just look for the inner yoke that attaches to the trans of the sm420, it should be the same for either the 1/2 ton or 3/4 ton. The donor trans that I am using for my swap came from a 3/4 ton and the input yoke will work with my stuff.
pm me youe email and I will send you some pics

Last edited by sstock; Sat Jan 13 2018 04:31 PM.

1953 Chevrolet 3100
Re: Output yoke for closed drive sm420 [Re: yellosub54] #1250803
Sat Jan 13 2018 06:30 PM
Sat Jan 13 2018 06:30 PM
E
Elderly Iron  Offline
Shop Shark
Joined: Dec 2006
Posts: 84
Southern Oregon
No yoke. I bought a bed full of stuff. Has the 420 and the first drive shaft, but no yoke. I never sorted through that pile since I got it. I found a complete sway bar! WOO HOO!!!

Re: Output yoke for closed drive sm420 [Re: yellosub54] #1250823
Sat Jan 13 2018 08:52 PM
Sat Jan 13 2018 08:52 PM
J
jorb  Online
Shop Shark
Joined: Mar 2011
Posts: 1,061
Wis
The U-Joint assembly is everything in THIS illustration.
The main parts of the U-Joint assembly are the front yoke, trunnion and rear yoke.
You can buy a U-Joint assembly or some of the items separately.

There are different yokes for 3 & 4 speed trannys.
Master Parts Catalog Yokes Group # 5.555
48-54, 1/2 ton, 4 speed tran. Front Yoke, part # 3686323
40-54, 1/2 ton, 4 speed tran. Rear Yoke, part # 3681934

48-54, 1/2 ton, 3 speed tran. Front Yoke , part # 591644
40-54, 1/2 ton, 3 speed tran. Rear Yoke, part # 3665768

Master Parts Catalog U-Joint Assembly Group # 5.548
48-54 1/2 ton, 3 speed tran. U-Joint assembly, # 591642 - Chevs of the 40's Scroll down.
48-54 1/2 ton, 4 speed tran. U-Joint assembly, # 3689266

40-54, 1/2 ton, 3 & 4 speed tran. Repair kit part, # 609944 Chevs of the 40's
Includes - 1 trunnion, 4 bearings, 2 snap rings, 4 hex bolts, 2 lock plates.

Call http://nwtparts.com/ Ask for John.
They should have everything you need.
You can also try Partsvoice For NOS parts. Just punch in the parts numbers and see what comes up.

Picture of a 4 speed 1/2 ton torque tube U-Joint Assembly.

Attached Files
1941-54 u joint .jpg (136 downloads)
torquetube.jpg (123 downloads)

1954 Chevrolet 3105 Deluxe Panel Truck
w/Factory HYDRA-MATIC

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Re: Output yoke for closed drive sm420 [Re: yellosub54] #1250835
Sat Jan 13 2018 10:24 PM
Sat Jan 13 2018 10:24 PM
O
original  Offline
Wrench Fetcher
Joined: Nov 2017
Posts: 69
Rocky Mountains
Hi,

Just sent you an email with photos of 5 of them. All Original...

Not from the reproduction places.

Thanks marzach for the heads up for this persons needs.





Re: Output yoke for closed drive sm420 [Re: yellosub54] #1250920
Sun Jan 14 2018 04:33 PM
Sun Jan 14 2018 04:33 PM
S
sstock  Online
Shop Shark
Joined: Jan 2013
Posts: 910
Gig Harbor, WA
Thanks for posting this info jorb.


1953 Chevrolet 3100
Re: Output yoke for closed drive sm420 [Re: yellosub54] #1250993
Mon Jan 15 2018 01:55 AM
Mon Jan 15 2018 01:55 AM
Y
yellosub54  Offline OP
Shop Shark
Joined: Aug 2003
Posts: 141
sonora, ca
FOUND ONE! Thanks everybody.


"I always win." Working mainly alone I do not let my trucks win a war. Maybe a battle here and there but never the war.

Robert
55.1 GMC 450 COE
51ish GMC Suburban
Re: Output yoke for closed drive sm420 [Re: yellosub54] #1255782
Wed Feb 21 2018 03:07 AM
Wed Feb 21 2018 03:07 AM
C
Chinito Quan  Offline
Shop Shark
Joined: Jan 2010
Posts: 171
Guatemala
Hi guys. After many years hiatus, got back on the horse. Can you please point me where did you found the front yoke assembly. Greatly appreciated. Also if anyone knows where to find part NO. 591679 (rear cover of SM420 transmission for the ball joint)

Re: Output yoke for closed drive sm420 [Re: yellosub54] #1255783
Wed Feb 21 2018 03:11 AM
Wed Feb 21 2018 03:11 AM
Y
yellosub54  Offline OP
Shop Shark
Joined: Aug 2003
Posts: 141
sonora, ca
There is a front yoke on ebay right now. Just make it's correct for what you need.


"I always win." Working mainly alone I do not let my trucks win a war. Maybe a battle here and there but never the war.

Robert
55.1 GMC 450 COE
51ish GMC Suburban
Re: Output yoke for closed drive sm420 [Re: yellosub54] #1255789
Wed Feb 21 2018 03:28 AM
Wed Feb 21 2018 03:28 AM
C
Chinito Quan  Offline
Shop Shark
Joined: Jan 2010
Posts: 171
Guatemala
Thanks. Do you have the link. If i put the part No. Louis Vuiton bags appear and Scuba yokes.

Re: Output yoke for closed drive sm420 [Re: yellosub54] #1255836
Wed Feb 21 2018 02:51 PM
Wed Feb 21 2018 02:51 PM
Y
yellosub54  Offline OP
Shop Shark
Joined: Aug 2003
Posts: 141
sonora, ca
Not sure if this is what you're after.

Yoke


"I always win." Working mainly alone I do not let my trucks win a war. Maybe a battle here and there but never the war.

Robert
55.1 GMC 450 COE
51ish GMC Suburban
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