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Goach2 #1427356 Wed Oct 20 2021 03:56 PM
Joined: Jan 2016
Posts: 719
G
Goach2 Offline OP
'Bolter
Thanks Steve - I will be dropping the trans soon, so should have some pics of the process.


1948 Chevrolet Thriftmaster 3/4 Ton
There are only 10 types of people in this world, those who can read binary and those who can't.
Goach2 #1429246 Fri Nov 05 2021 12:42 AM
Joined: Jan 2016
Posts: 719
G
Goach2 Offline OP
'Bolter
Ok, time for cleanup, then I guess compare this one with my spare to see which is in the best shape to use and install my gasket set:

[img]https://www.stovebolt.com/ubbthread...umber/36541/filename/20211104_203322.jpg[/img][img]https://www.stovebolt.com/ubbthread...umber/36542/filename/20211104_203331.jpg[/img]


1948 Chevrolet Thriftmaster 3/4 Ton
There are only 10 types of people in this world, those who can read binary and those who can't.
Goach2 #1429340 Fri Nov 05 2021 11:21 PM
Joined: Jan 2016
Posts: 719
G
Goach2 Offline OP
'Bolter
About 20lbs lighter now. Bottom half is pretty wet, so probably leaking from the front? Any concerns from the pics? Can I stuff a rag in the top and back u-joint and then power wash it?
[img]https://www.stovebolt.com/ubbthread...umber/36562/filename/20211105_191633.jpg[/img][img]https://www.stovebolt.com/ubbthread...umber/36563/filename/20211105_191642.jpg[/img]


1948 Chevrolet Thriftmaster 3/4 Ton
There are only 10 types of people in this world, those who can read binary and those who can't.
Goach2 #1429403 Sat Nov 06 2021 10:46 PM
Joined: Jan 2016
Posts: 719
G
Goach2 Offline OP
'Bolter
[img]https://www.stovebolt.com/ubbthread...umber/36576/filename/20211106_184236.jpg[/img]Degreased, what do I need to do to assess the condition of this?

Also, is this normal?
https://photos.app.goo.gl/PnXT1UmJykLXhjWm6


1948 Chevrolet Thriftmaster 3/4 Ton
There are only 10 types of people in this world, those who can read binary and those who can't.
Goach2 #1429405 Sat Nov 06 2021 10:53 PM
Joined: Sep 2010
Posts: 1,446
K
'Bolter
I think it’s a little loose there are bearings under there that you can replace ,there are kits and some videos online showing rebuilding the sm420.check you newer trans the same way and see how much it moves for comparison .I would also take the top of the trans off to see what it looks like inside

Last edited by KEVINSKI; Sat Nov 06 2021 10:59 PM. Reason: More imfo
Goach2 #1429413 Sat Nov 06 2021 11:46 PM
Joined: Jan 2013
Posts: 1,685
S
'Bolter
Put a kit into it. Pretty easy includes all new bearings and needle bearings too and gaskets for about $125 on flea bay. You will need a press and some bearing separators from harbor freight. I've done about a dozen of the sm420, pretty straightforward. Syncros are still available but if it is shifting well wouldnt bother.


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
Goach2 #1429415 Sat Nov 06 2021 11:51 PM
Joined: Jan 2016
Posts: 719
G
Goach2 Offline OP
'Bolter
Front bearing has way too much play:
https://photos.app.goo.gl/W11jC3VaJUXhwjHs8

Synchros have some wear, not sure how bad they look:
[img]https://www.stovebolt.com/ubbthread...umber/36579/filename/20211106_194312.jpg[/img][img]https://www.stovebolt.com/ubbthread...umber/36580/filename/20211106_194316.jpg[/img]

I have all the gaskets for this trans. Guess I should look at the spare now to see if it"s any better.


1948 Chevrolet Thriftmaster 3/4 Ton
There are only 10 types of people in this world, those who can read binary and those who can't.
Goach2 #1429417 Sun Nov 07 2021 12:01 AM
Joined: Jan 2016
Posts: 719
G
Goach2 Offline OP
'Bolter
[img]https://www.stovebolt.com/ubbthread...umber/36581/filename/20211106_195805.jpg[/img]

Spare (newer) trans has less wiggle, but clearly it was exposed to a bit of weather. Has different coloured synchros too. Not sure if there's any value in rebuilding one over the other...


1948 Chevrolet Thriftmaster 3/4 Ton
There are only 10 types of people in this world, those who can read binary and those who can't.
Goach2 #1429420 Sun Nov 07 2021 12:37 AM
Joined: Sep 2010
Posts: 1,446
K
'Bolter
I have one like that ,looks like you will have enough parts to make one good one there are some parts that are not available for the sm 420 .look up Denny Graham up top on the member list he has a good pictorial of a rebuild as well as a stand for the transmission.

Goach2 #1429457 Sun Nov 07 2021 03:19 PM
Joined: Jan 2016
Posts: 719
G
Goach2 Offline OP
'Bolter
When I got this truck, it had no rear motor mounts. I would say that would likely cause ths input bearing wear. Since everything else looks good and I've been driving it for 5 years with no complaint, can I change out this bearing only and regasket and move on? I don't have access to a press and the secondary shaft with the freeze plug type end worries me.


1948 Chevrolet Thriftmaster 3/4 Ton
There are only 10 types of people in this world, those who can read binary and those who can't.
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