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Bad bug
Samba Member
Joined: March 11, 2006
Posts: 1105
Location: Jamaica
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 Posted: Wed Dec 07, 2022 1:42 pm Post subject: Superdiff in a daily driver. |
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| As the heading states is there anyone here running one in a true 5 days per week daily driver car. The car is IRS. |
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Alstrup
Samba Member
Joined: July 12, 2007
Posts: 6536
Location: Videbaek Denmark
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UK Luke 72
Samba Member
Joined: September 07, 2011
Posts: 2748
Location: Little Britain
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Bad bug
Samba Member
Joined: March 11, 2006
Posts: 1105
Location: Jamaica
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| Posted: Wed Dec 07, 2022 2:38 pm Post subject: Re: Superdiff in a daily |
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| Thanks for the replies so far, Luke, how did you find the diff to be, is it hard to drive the car on the street.[/list] |
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UK Luke 72
Samba Member
Joined: September 07, 2011
Posts: 2748
Location: Little Britain
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Glenn 
Mr. 010
Joined: December 25, 2001
Posts: 74674
Location: Sneaking up behind you
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| Posted: Wed Dec 07, 2022 2:44 pm Post subject: Re: Superdiff in a daily driver. |
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I had a Superdiff in my daily for 10 years and put over 125,000 miles on it.
Changed the gear lube and found bits in it.
Took the transaxle apart and found the spider gears have seen better days.
Replaced it with a ZF LSD.
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"
Member #1009
"Politics is the art of looking for trouble, finding it everywhere, diagnosing it incorrectly and applying the wrong remedies."
Groucho Marx |
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petrol punk
Samba Member
Joined: August 21, 2007
Posts: 928
Location: Las Vegas, NV
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| Posted: Wed Dec 07, 2022 2:48 pm Post subject: Re: Superdiff in a daily driver. |
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If the guy who I bought my IRS tranny from is to be believed it has a super diff. I've never had an issue or really noticed any difference from the stock diff in my other splitcase trans oval.
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Stock 36hp '56 European DeLuxe oval, '70 bug 1835cc dual 36DRLA, and a '98 4x4 5spd single cab Tacoma |
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Bad bug
Samba Member
Joined: March 11, 2006
Posts: 1105
Location: Jamaica
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| Posted: Wed Dec 07, 2022 2:53 pm Post subject: Re: Superdiff in a daily driver. |
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| Thanks for all the replies, Glenn, a limited is not in rhe cards for me at the moment. Luke, are you running a swing axle backend car? |
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UK Luke 72
Samba Member
Joined: September 07, 2011
Posts: 2748
Location: Little Britain
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madmike
Samba Member
Joined: July 11, 2005
Posts: 5134
Location: Atlanta,Michigan
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| Posted: Wed Dec 07, 2022 3:03 pm Post subject: Re: Superdiff in a daily driver. |
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The Swing axle super diff were the problematic ones  Old IRS supers no issues, Glenns was where? made in Brasil?
_________________
'Black Ice'Drag Buggy 'Turbo'
Rail Buggy 1915 turbo
76 Drag/Street bug 2180cc 'Turbo' 11:85 @113 mph"If I go any faster I'll burn up the Hamster" ,gets 28 mpg. also 10/09/22 11.90 @115 mph
"If I'm ever on Life Support,UNPLUG Me, Then Plug me back In see if that Works" |
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Glenn
Mr. 010
Joined: December 25, 2001
Posts: 74674
Location: Sneaking up behind you
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| Posted: Wed Dec 07, 2022 3:04 pm Post subject: Re: Superdiff in a daily driver. |
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| madmike wrote: |
| The Swing axle super diff were the problematic ones Old IRS supers no issues, Glenns was where? made in Brasil? |
Yes.
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"
Member #1009
"Politics is the art of looking for trouble, finding it everywhere, diagnosing it incorrectly and applying the wrong remedies."
Groucho Marx |
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Bad bug
Samba Member
Joined: March 11, 2006
Posts: 1105
Location: Jamaica
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Glenn
Mr. 010
Joined: December 25, 2001
Posts: 74674
Location: Sneaking up behind you
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| Posted: Wed Dec 07, 2022 5:03 pm Post subject: Re: Superdiff in a daily driver. |
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This is the side cover on my tranny. BTW, i have a Berg 5.
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"
Member #1009
"Politics is the art of looking for trouble, finding it everywhere, diagnosing it incorrectly and applying the wrong remedies."
Groucho Marx |
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madmike
Samba Member
Joined: July 11, 2005
Posts: 5134
Location: Atlanta,Michigan
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| Posted: Wed Dec 07, 2022 5:16 pm Post subject: Re: Superdiff in a daily driver. |
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Glenn has a Factory HD Aluminium cover, Just as strong as some aftermarket ones
_________________
'Black Ice'Drag Buggy 'Turbo'
Rail Buggy 1915 turbo
76 Drag/Street bug 2180cc 'Turbo' 11:85 @113 mph"If I go any faster I'll burn up the Hamster" ,gets 28 mpg. also 10/09/22 11.90 @115 mph
"If I'm ever on Life Support,UNPLUG Me, Then Plug me back In see if that Works" |
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RickS
Samba Member
Joined: May 05, 2005
Posts: 295
Location: Speonk, NY
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| Posted: Wed Dec 07, 2022 6:41 pm Post subject: Re: Superdiff in a daily driver. |
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That Aluminum Super Diff is made by Dave Folts. It is really nice, uses 091 side and spider gears. Call Dave directly if you want one. I bought one from him last month for SIGNIFICANTLY LESS money then Weddle charges. The only issue is Weddle is out of stock on the HD spider gears for it. I called last week for an update and they told me they expected them last week, so should be soon. |
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Clatter
Samba Member
Joined: September 24, 2003
Posts: 6837
Location: Santa Cruz
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| Posted: Wed Dec 07, 2022 8:00 pm Post subject: Re: Superdiff in a daily driver. |
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| madmike wrote: |
| Glenn has a Factory HD Aluminium cover, Just as strong as some aftermarket ones |
Doesn’t it have less strength now that it’s been machined down like that?
That’s done for weight savings, or maybe looks? 
I remember the old Transform shop used to do that…
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Clatter
Samba Member
Joined: September 24, 2003
Posts: 6837
Location: Santa Cruz
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| Posted: Wed Dec 07, 2022 8:08 pm Post subject: Re: Superdiff in a daily driver. |
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A super diff won’t drive any different than a regular 2-spider diff.
Unless it’s a cheap POS and breaks, locking things up,
(Like a lot are nowadays, especially swing axle).
It’s not a TBD or LSD or spool…
Late Vanagons came stock with a 4-spider a.k.a. “Super” diff.
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Glenn
Mr. 010
Joined: December 25, 2001
Posts: 74674
Location: Sneaking up behind you
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| Posted: Wed Dec 07, 2022 8:20 pm Post subject: Re: Superdiff in a daily driver. |
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| Clatter wrote: |
A super diff won’t drive any different than a regular 2-spider diff.
Unless it’s a cheap POS and breaks, locking things up,
(Like a lot are nowadays, especially swing axle).
It’s not a TBD or LSD or spool…
Late Vanagons came stock with a 4-spider a.k.a. “Super” diff. |
A Super Diff is still an "open" diff. It just spreads the load across 3 spider gears instead of just 2.
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"
Member #1009
"Politics is the art of looking for trouble, finding it everywhere, diagnosing it incorrectly and applying the wrong remedies."
Groucho Marx |
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Clatter
Samba Member
Joined: September 24, 2003
Posts: 6837
Location: Santa Cruz
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| Posted: Wed Dec 07, 2022 9:15 pm Post subject: Re: Superdiff in a daily driver. |
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| Glenn wrote: |
| Clatter wrote: |
A super diff won’t drive any different than a regular 2-spider diff.
Unless it’s a cheap POS and breaks, locking things up,
(Like a lot are nowadays, especially swing axle).
It’s not a TBD or LSD or spool…
Late Vanagons came stock with a 4-spider a.k.a. “Super” diff. |
A Super Diff is still an "open" diff. It just spreads the load across 3 spider gears instead of just 2. |
Ya,
I hear ya!
Supposed to be 4 spiders,
But with the quality of most,
One’s just along for the ride..!
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Bus Motor Build
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AlteWagen
Troll
Joined: February 23, 2007
Posts: 8296
Location: PNW
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| Posted: Thu Dec 08, 2022 3:45 pm Post subject: Re: Superdiff in a daily driver. |
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I think there are two different part groups that are being discussed
-Gear carrier/differential housing
-Spider gear assembly
The common term 'super diff' refers to a HD gear carrier which is where the ring gear bolts to and houses the spider gear assembly. This HD casting if being used on the street needs to be drilled so there is proper oil flow over the spider gears.
Here is a comparison pic. Note how open the stock carrier is which allows the needed splash oiling on the spider gears.
Super diff shown with oiling mods
The spider gear assembly in stock form only uses two spider gears. The 4 spider gear assembly or more commonly known as the 'beef a diff' helps spread the load to more gear teeth compared to stock set up. While this 4 spider setup is the usual upgrade when installing a HD gear carrier it can also be used in the factory carrier for an upgrade as well.
Stock 2 gear setup (swing shown)
Beef a diff
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