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[email protected]
Samba Member
Joined: March 18, 2002
Posts: 599
Location: Peterborough, Ontario, Canada
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 Posted: Mon Jun 23, 2025 3:02 pm Post subject: Big nut reduction boxes. Different? |
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Hey all, I just picked up these reduction boxes and I failed to notice that they are somewhat different. They are both big nut boxes and a quick count of turns tells me they are the same ratio. (I haven't pulled them apart to count teeth, I just marked the axle flange and the stubs and counted a revolution, if you will)
I noticed that one has the flat top to accept a bump stop and the other does not.
Does this mean that one is 3/4 ton and the other is 1 ton?
Any info is greatly appreciated
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BarryL 
Samba Member
Joined: November 01, 2004
Posts: 15261
Location: Casa de Oro, California
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| Posted: Mon Jun 23, 2025 6:23 pm Post subject: Re: Big nut reduction boxes. Different? |
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| Don't know when they went to the bump-stop but it shouldn't matter for fit and compatibility. Hardly ever does the bump-stop hit. |
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Chuey
Samba Member
Joined: October 18, 2010
Posts: 886
Location: Oceanside, California
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| Posted: Mon Jun 23, 2025 9:50 pm Post subject: Re: Big nut reduction boxes. Different? |
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The one without the bump stop probably belonged to the guy who invented those Kong chew toys for dogs. 
Chuey |
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adriano
Samba Member
Joined: March 14, 2008
Posts: 147
Location: Iseo Lake
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| Posted: Mon Jun 23, 2025 11:29 pm Post subject: Re: Big nut reduction boxes. Different? |
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| Stop bumper was introduced from chassis 215 036 651 MY 65 |
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Clara
Samba Member
Joined: June 14, 2003
Posts: 12615
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| Posted: Tue Jun 24, 2025 8:10 am Post subject: Re: Big nut reduction boxes. Different? |
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| adriano wrote: |
| Stop bumper was introduced from chassis 215 036 651 MY 65 |
early 1 tons did not have bump stops
late 1 ton axle tubes do have bump stops.
If you are putting the tranny in a 61, or other bus w/o the upper stops for the bump stops, it doesn't matter.
If putting it in a late split that has the upper stops for the bump stops, I would use axle tubes with the bump stops, if I had the option.
Then again, I've taken the 66 kombi on Shasta a few times. 
you can see where teh bumpers stop against in this pic:
_________________
The Obsolete Air-Cooled Documentation Project http://oacdp.org/ |
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[email protected]
Samba Member
Joined: March 18, 2002
Posts: 599
Location: Peterborough, Ontario, Canada
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| Posted: Tue Jun 24, 2025 9:12 am Post subject: Re: Big nut reduction boxes. Different? |
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| Clara wrote: |
| adriano wrote: |
| Stop bumper was introduced from chassis 215 036 651 MY 65 |
early 1 tons did not have bump stops
late 1 ton axle tubes do have bump stops.
If you are putting the tranny in a 61, or other bus w/o the upper stops for the bump stops, it doesn't matter.
If putting it in a late split that has the upper stops for the bump stops, I would use axle tubes with the bump stops, if I had the option.
Then again, I've taken the 66 kombi on Shasta a few times.
you can see where teh bumpers stop against in this pic:
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So for clarification, are you indicating that I have 1 early 1 ton axle and 1 late 1 ton axle? |
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Clara
Samba Member
Joined: June 14, 2003
Posts: 12615
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| Posted: Tue Jun 24, 2025 9:28 am Post subject: Re: Big nut reduction boxes. Different? |
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| [email protected] wrote: |
| Clara wrote: |
| adriano wrote: |
| Stop bumper was introduced from chassis 215 036 651 MY 65 |
early 1 tons did not have bump stops
late 1 ton axle tubes do have bump stops.
If you are putting the tranny in a 61, or other bus w/o the upper stops for the bump stops, it doesn't matter.
If putting it in a late split that has the upper stops for the bump stops, I would use axle tubes with the bump stops, if I had the option.
Then again, I've taken the 66 kombi on Shasta a few times.
you can see where teh bumpers stop against in this pic:
[img]https://www.thesamba.com/vw/classifieds/pix/10622210.jpg[/img |
So for clarification, are you indicating that I have 1 early 1 ton axle and 1 late 1 ton axle? |
Well, actually, early 1 ton is the 63 little nut version, so you have one mid 1 ton axle/RGB and one late 1 ton axle tube/RGB
I can tell they are both 64-67 one ton as they both have the circle on the side that faces the spring plate. That's the plug you have to pull out to get to the inner nut for the lower inner bearing.
You can run those as a pair.
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The Obsolete Air-Cooled Documentation Project http://oacdp.org/ |
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[email protected]
Samba Member
Joined: March 18, 2002
Posts: 599
Location: Peterborough, Ontario, Canada
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| Posted: Tue Jun 24, 2025 9:42 am Post subject: Re: Big nut reduction boxes. Different? |
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Thank you for the clarification Clara! I greatly appreciate your input and everyone else's on here!  |
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