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Old 02-02-2006, 01:20 AM   #1
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Default Do All 1/8th Scale Buggies Have PLASTIC Diff Cups?

I saw the diff cups for the Ofna 9.5 Pro kit and the diff cups are plastic. It reminded me of the T-Maxx diff cups, which are not real durable.

Do all buggies have plastic diff cups, or is this just a cheap kit?

Thanks
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Old 02-02-2006, 04:24 AM   #2
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No, not all have plastic diff cups. I know that the Hyper 7 Pro and the XB8 do not have plastic.
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Old 02-02-2006, 10:42 AM   #3
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CENs are metal as well I believe.
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Old 02-02-2006, 06:15 PM   #4
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Quote:
Originally Posted by Chase
I saw the diff cups for the Ofna 9.5 Pro kit and the diff cups are plastic. It reminded me of the T-Maxx diff cups, which are not real durable.

Do all buggies have plastic diff cups, or is this just a cheap kit?

Thanks

^^^^^^^^^ ^^^^^^^^^^

What are you talking about??? First Ofna 1/8th scale buggies use steel or aluminum diff cups and dogbones, cvds, or universals...... second the T-Maxx, E-maxx, sport-maxx, and pretty much everything else traxxas sells uses diff joints and sliders.... they cannot use diff cups because the sliders would not stay in...... unless you saw something somebody custom made????
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Old 02-02-2006, 09:57 PM   #5
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There is no such thing as a 1/8th buggy with plastic outdrives of any kind. Infact I don't know of any 1/8th buggy that has any plastic in the drivetrain besides the diff cups.
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Old 02-02-2006, 10:01 PM   #6
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I think he means that the diff housing is plastic. They are made of molded engineered fiber reinforced plastic to reduce the rotating mass. This is almost universal among RC vehicles.

The outdrives are usually steel with a few exceptions.
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Old 02-03-2006, 01:13 AM   #7
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Nope - I'm talking about the cup that resides INSIDE the diff housing. Not outdrives, not CVAs/CVDs, not sliders, but Diff Cups. They are plastic. I was told that most all buggies have plastic diff cups.

Just trying to verify that.

Thanks again.
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Old 02-03-2006, 02:09 AM   #8
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Quote:
Originally Posted by Chase
Nope - I'm talking about the cup that resides INSIDE the diff housing. Not outdrives, not CVAs/CVDs, not sliders, but Diff Cups. They are plastic. I was told that most all buggies have plastic diff cups.

Just trying to verify that.

Thanks again.
I seriously doubt any 1/8 scale buggy has any plastic differential cups. It would not hold up against the stress and heat in a nitro R/C car.
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Old 02-03-2006, 02:30 AM   #9
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Quote:
Originally Posted by Chase
Nope - I'm talking about the cup that resides INSIDE the diff housing. Not outdrives, not CVAs/CVDs, not sliders, but Diff Cups. They are plastic. I was told that most all buggies have plastic diff cups.
what i know inside the diff housing only got cross pin, drive cup pin, connical gear/diff gear, shim and all are hardened steel or cast alloy.. where come the plactic cup u mention???
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Old 02-03-2006, 02:58 AM   #10
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He's talking about the case that houses the 6 inner diff gears. Every buggy on the market has these in plastic, there is no need to be concered. They do not wear out fast, and they will never break on you. Although some buggies do have steel on one end where the output shaft exits to extend life span. My Jammin did have these, most cheaper vehicles dont (the Tmaxx doesnt).
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Old 02-03-2006, 07:29 AM   #11
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Quote:
Originally Posted by Chase
Nope - I'm talking about the cup that resides INSIDE the diff housing. Not outdrives, not CVAs/CVDs, not sliders, but Diff Cups. They are plastic. I was told that most all buggies have plastic diff cups.

Just trying to verify that.

Thanks again.
First thing is that it is not called a cup which is why you threw off most of the people trying to answer your poorly worded (nomenclature) question.

Second, the diff housing, yes what you refer to a cup is really called a housing, isn't subjected to great forces other than spinning so they do last for a long time. In fact the housing usually outlasts the metal gears inside it. When those are misaligned or not shimmed properly they will wear out. The other thing that may ruin a housing is improper assembly.

Third the diff housing is usually installed in a bulkhead which holds the diff in place and on almost every 1/8 buggy this is made of plastic too.
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Old 02-04-2006, 12:43 AM   #12
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Ahh - thanks for the clarification. Traxxas calls it a "diff cup" on their T-Maxx, so I thought that was the name.

Thanks for the help.
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