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Emergency Brake Question
#1420044 Tue Aug 10 2021 02:35 AM
Joined: Jul 2013
Posts: 246
J
JoeR Offline OP
'Bolter
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.

Attached Files
transmission 5.jpg (59.51 KB, 142 downloads)
Re: Emergency Brake Question
JoeR #1420110 Tue Aug 10 2021 06:11 PM
Joined: Apr 2021
Posts: 88
3
'Bolter
Couple of photos from my 40...Not the best quality but they may give you some reference points

Attached Files
IMG_3121.JPG (41.81 KB, 117 downloads)
Last edited by 32vsnake; Tue Aug 10 2021 06:15 PM.
Re: Emergency Brake Question
JoeR #1420143 Tue Aug 10 2021 08:30 PM
Joined: Jul 2013
Posts: 246
J
JoeR Offline OP
'Bolter
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

Re: Emergency Brake Question
JoeR #1420155 Tue Aug 10 2021 08:59 PM
Joined: Feb 2004
Posts: 23,638
H
Kettle Custodian (pot stirrer)
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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Re: Emergency Brake Question
JoeR #1420257 Wed Aug 11 2021 02:10 PM
Joined: Jul 2013
Posts: 246
J
JoeR Offline OP
'Bolter
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

Attached Files
transmission 2.jpg (57.26 KB, 79 downloads)

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