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dinsdale
Samba Member
Joined: October 12, 2005
Posts: 93
Location: London, UK
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 Posted: Tue Sep 12, 2006 10:40 am Post subject: Reduction box differences |
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Hi,
Are the stub axles on a '54 reduction box interchangeable with all the small nut boxes, or are there differences? I might need to replace my stub axles and need to know what parts I can use.
Cheers
Pete |
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hazetguy
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Joined: April 06, 2001
Posts: 10804
Location: the past
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| Posted: Tue Sep 12, 2006 11:04 am Post subject: |
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go to the gallery, search the word "reduction" by sumbitter "hazetguy". scroll down to the pics titled "Bus Reduction Box Axles". there are about 8 pics that show some differences.
if you put later (non barndoor) axles in, i am pretty sure you will need to replace outer reduction box housing, the backing plates, brake shoes (and hardware), brake drum, bearing cover, etc. basically everything from the housing cover outwards. i have not personally done this, so it is just an educated speculation.
there is some info in the bentley service manual, section H, page 10-1. |
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sgellis
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Joined: July 06, 2016
Posts: 2216
Location: SW Nova Scotia, Canada
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Clara 
Samba Member
Joined: June 14, 2003
Posts: 12653
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| Posted: Wed Aug 06, 2025 4:32 pm Post subject: Re: Reduction box differences |
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| sgellis wrote: |
| Can someone confirm that small nut reduction gears, bearings, stub axel and outer case will fit a barndoor axel tube? |
Can you check the RGB cover bolt pattern and shape, and compare it to the inner half of the box?
I guess I could find pics of the gaskets
This is a 55-63 and a 64-67 gasket
Pic from hazetguy, bd: 8 bolts
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sgellis
Samba Member
Joined: July 06, 2016
Posts: 2216
Location: SW Nova Scotia, Canada
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| Posted: Thu Aug 07, 2025 8:14 am Post subject: Re: Reduction box differences |
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| Clara wrote: |
| sgellis wrote: |
| Can someone confirm that small nut reduction gears, bearings, stub axel and outer case will fit a barndoor axel tube? |
Can you check the RGB cover bolt pattern and shape, and compare it to the inner half of the box?
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Gasket and bearings are the same as small nut. Everything looks like it would work but haven't found an example of it being done. My only concern is if the casting seam was offset differently but that is unlikely.
I assumed if it was possible that it would be a common upgrade to use later brakes.
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Who.Me?
Samba Member
Joined: July 14, 2014
Posts: 2583
Location: UK (South)
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| Posted: Thu Aug 07, 2025 9:01 am Post subject: Re: Reduction box differences |
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| sgellis wrote: |
| I assumed if it was possible that it would be a common upgrade to use later brakes. |
There's some reference to fitting later drums to barndoor RGBs in the Bentley manual. It mentions fitting the later stub-axle and driven gear.
Is the issue that you don't have the barndoor outer RGB case halves?
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sgellis
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Joined: July 06, 2016
Posts: 2216
Location: SW Nova Scotia, Canada
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Lind
Samba Member
Joined: November 06, 2000
Posts: 10265
Location: idaho
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| Posted: Thu Aug 07, 2025 10:37 am Post subject: Re: Reduction box differences |
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| sgellis wrote: |
| Can someone confirm that small nut reduction gears, bearings, stub axel and outer case will fit a barndoor axel tube? |
I have done this before, it works fine, straight bolt on. You have to use smallnut stuff of course.
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sgellis
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Joined: July 06, 2016
Posts: 2216
Location: SW Nova Scotia, Canada
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Mr. OGPaint
Samba Member
Joined: September 24, 2010
Posts: 844
Location: Oregon
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| Posted: Mon Aug 18, 2025 2:33 pm Post subject: Re: Reduction box differences |
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I just wanted to co-sign Lind that the guts do fit as a direct swap. Also, a 55-62 (and 63?) outer cover for an RGB can be used with minimal modifications if a Barndoor outer cover cannot be sourced. The later cover appears identical and the modifications are invisible once the brakes are installed.
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Patrick Hall |
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