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Fixing the old truck

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#1420044 08/10/2021 2:35 AM
Joined: Jul 2013
Posts: 213
J
'Bolter
'Bolter
J Offline
Joined: Jul 2013
Posts: 213
A prior owner of my '40 1/2 ton replaced the drive line. It now has a '53 235, a Muncie 4 speed crash box and an open drive. In the process they removed the emergency brake handle and cables. Does anyone know if a '40 emergency brake set up will fit on the Muncie? I'm not sure where the original handle attached. If anyone out there has photos I would appreciate it. This is what my set up looks like now.
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transmission 5.jpg (59.51 KB, 146 downloads)


1946 Chevy 3/4 Ton Flatbed
Tearing her down
Story in the DITY Gallery
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Joined: Apr 2021
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3
'Bolter
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Couple of photos from my 40...Not the best quality but they may give you some reference points
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IMG_3121.JPG (41.81 KB, 121 downloads)

Last edited by 32vsnake; 08/10/2021 6:15 PM.

1940 1/2-ton
Low skill and low buck build
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Joined: Jul 2013
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J
'Bolter
'Bolter
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Joined: Jul 2013
Posts: 213
Hi Snake,

Thank you. Looks like the brake bracket bolts to the 2 threaded holes on the right side of the transmission. Now I just have to find one.

Joe


1946 Chevy 3/4 Ton Flatbed
Tearing her down
Story in the DITY Gallery
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Joined: Feb 2004
Posts: 28,674
H
Kettle Custodian (pot stirrer)
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Your terminology is a little confusing. The term "crash box" refers to a non-synchronized 4 speed used prior to around 1947 or so when GM started using the SM-420 synchronized 4 speed. Those two transmissions have completely different driveline-mounted parking brakes, and the 420 has at least two different designs, based on the load capacity of the truck it was used with. Can you post a wider perspective photo of the transmission you're using so we can tell which one you have? The one in Snake's photo is an actual "crash box" and the lever he shows operates a parking brake on the rear axle, not the transmission.
Jerry


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Joined: Jul 2013
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J
'Bolter
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Posts: 213
Hi Jerry,

It the transmission in this link, https://www.stovebolt.com/ubbthreads/ubbthreads.php/topics/1419647/is-this-an-sm-420.html. I've had it apart to fix the reverse gear dog and there are no syncros.

Joe
Attachments
transmission 2.jpg (57.26 KB, 83 downloads)


1946 Chevy 3/4 Ton Flatbed
Tearing her down
Story in the DITY Gallery
More images

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