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#1454977 Mon Jun 13 2022 12:52 AM
Joined: Sep 2010
Posts: 1,419
K
'Bolter
Sm420 in 54 gmc ,found at the bottom ,any idea what caused this tranny was working okay . 3rd picture is from another tranny showing the parts that were sheared off.

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kevinski 1954 GMC 9300 Welcome to the virtual Garage [stovebolt.com]
KEVINSKI #1455017 Mon Jun 13 2022 03:04 PM
Joined: Jul 2014
Posts: 921
D
'Bolter
Kevinski , I'm curious as well. That looks like the energizing lugs off of the 2nd speed gear synchronizer cone. Hopefully one of our experts will chime in and I can learn something too.

GM Group 4.383 , part number 591566


Ron
1954 Chevy 3604 - A work in progress...
Veteran, USMC

" You can't keep dancing with the Devil and wonder why you're still in Hell ! "

"Everything happens for a reason, sometimes the reason is you're stupid and make bad decisions"
Dusty53 #1455045 Mon Jun 13 2022 07:46 PM
Joined: Sep 2011
Posts: 1,182
B
'Bolter
Originally Posted by Dusty53
Kevinski , I'm curious as well. That looks like the energizing lugs off of the 2nd speed gear synchronizer cone.

GM Group 4.383 , part number 591566


That's what it looks like.
Don't know about your area but around here SM420 units are easy to find.


BC
1960 Chevy C10 driver 261 T5 3.73 dana 44
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022
KEVINSKI #1455069 Tue Jun 14 2022 12:33 AM
Joined: Jul 2014
Posts: 921
D
'Bolter
FYI, if your thinking of rebuilding / repairing there are two new / nos 2nd speed synchronizer cones on Ebay, not over-priced. Search for GM# 591566 on Ebay. Good luck and hoping to hear what could have caused this type of damage.


Ron
1954 Chevy 3604 - A work in progress...
Veteran, USMC

" You can't keep dancing with the Devil and wonder why you're still in Hell ! "

"Everything happens for a reason, sometimes the reason is you're stupid and make bad decisions"
KEVINSKI #1455080 Tue Jun 14 2022 02:02 AM
Joined: Sep 2010
Posts: 1,419
K
'Bolter
Not a problem had a extra one from a 67 pickup with the back up switch that I saved from the mid 80,s .I am going to use that one and was just curious as to what happened as the lugs are quite thick.I was using the truck up to a few years ago and it had a few issues but it still worked okay ,I think after pushing the clutch in it would make a noise then if I put it in neutral let the clutch out and pushed it back in and into gear the noise would stop (not a grinding just a rolling noise like something was still spinning).


kevinski 1954 GMC 9300 Welcome to the virtual Garage [stovebolt.com]
KEVINSKI #1455306 Thu Jun 16 2022 03:29 AM
Joined: Jul 2014
Posts: 921
D
'Bolter
Agreed on the thick lugs, its a mystery to me for sure.


Ron
1954 Chevy 3604 - A work in progress...
Veteran, USMC

" You can't keep dancing with the Devil and wonder why you're still in Hell ! "

"Everything happens for a reason, sometimes the reason is you're stupid and make bad decisions"
KEVINSKI #1456355 Sat Jun 25 2022 04:58 AM
Joined: Jul 2014
Posts: 392
1
'Bolter
Save the good parts. Some parts are no longer available new, like main drive gears, I think. I learned this from buying parts from Novac 4x4 in Utah. Also some 2nd gear syncros for the earlier boxes, I think. We used to think these SM420s were indestructible but the last of them were made almost 60 years ago. Fortunately there are still lots of good used parts and complete boxes around.


51 3800 PU, 62 261 (w/cam, Fenton headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971.

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