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Bruce Samba Member
Joined: May 16, 2003 Posts: 17290 Location: Left coast, Canada
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Posted: Sun Jul 31, 2016 10:04 am Post subject: Re: Fitting 60's gearbox to 51 split. |
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You would probably be amazed to learn how many former IRS gearboxes are now swing axle. They have all the good parts inside.
The earliest swing axle gearboxes are junk compared to later ones. Also, they are geared wrong for a 1600. _________________
overheard at the portland Swap Meet... wrote: |
..... a steering wheel made from a mastadon tusk..... |
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splitjunkie Samba Member
Joined: April 04, 2006 Posts: 4095
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Posted: Sun Jul 31, 2016 12:56 pm Post subject: Re: Fitting 60's gearbox to 51 split. |
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You can convert any irs transmission to swingaxle as long as it has the two side cover case. At some point in the 70's the case only had one removable side cover. To convert a two side cover irs you need the swingaxle differential, side covers, bearings, shims and axles. You have to retain the ring gear and reset the backlash and bearing preload. _________________ Chris
You know, a lot of these scratches will buff right out... Jerry Seinfeld |
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jason Samba Member
Joined: August 07, 2002 Posts: 3444 Location: Garage
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Posted: Fri Aug 12, 2016 2:03 pm Post subject: Re: Fitting 60's gearbox to 51 split. |
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I like my $6 mount better, everything is external, nothing inside required. Fast fab looks better though. |
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splitjunkie Samba Member
Joined: April 04, 2006 Posts: 4095
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Posted: Sat Aug 13, 2016 5:49 am Post subject: Re: Fitting 60's gearbox to 51 split. |
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jason wrote: |
I dont like those type of mounts for non reduction boxes. Reductions push the nose cone down where the rubber is thick. Non reductions push it up where the rubber is thin.
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can you explain what you mean by this? _________________ Chris
You know, a lot of these scratches will buff right out... Jerry Seinfeld |
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EVfun Samba Member
Joined: April 01, 2012 Posts: 5481 Location: Seattle
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Posted: Sat Aug 13, 2016 10:24 am Post subject: Re: Fitting 60's gearbox to 51 split. |
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looking at the left (drivers) side of the car, when you go forward the rear wheel rotates counter-clockwise. On a Bug that means the ring gear rotates counter-clockwise. This means the pinion gear tries to climb the ring gear, or rotate clockwise around it. That is the motion the transaxle mounts have to resist when accelerating.
On a Bus you add a reduction gear to each axle. The tires are still rotating counter-clockwise when going forward but the ring gear is now turning clockwise when viewed from the left side of the Bus. That means the pinion gear is trying to move down and pushes the front of the transaxle down when accelerating. _________________
Wildthings wrote: |
As a general rule, cheap parts are the most expensive parts you can buy. |
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koolerkrotch Samba Member
Joined: August 25, 2015 Posts: 54 Location: CT and FL
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Posted: Sun Aug 14, 2016 4:01 am Post subject: Re: Fitting 60's gearbox to 51 split. |
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I'm driving it now..feels fine...works great. I could see where some regular use of hole shots and drag starts would shorten it's life, but this car doesn't get that type of use ever. |
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Not Safari Izzy Samba Member
Joined: February 16, 2004 Posts: 837 Location: Santa Clara, CA
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Posted: Sun Aug 14, 2016 1:45 pm Post subject: Re: Fitting 60's gearbox to 51 split. |
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Put the concept1 nose cone on a tunnel tranny and installed it in my 11G pan yesterday, figured I'd throw up a picture:
_________________ DBK Nor Cal
1952 Beetle 11G
1956 Beetle 151 |
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splitjunkie Samba Member
Joined: April 04, 2006 Posts: 4095
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Posted: Sun Aug 14, 2016 3:50 pm Post subject: Re: Fitting 60's gearbox to 51 split. |
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EVfun wrote: |
looking at the left (drivers) side of the car, when you go forward the rear wheel rotates counter-clockwise. On a Bug that means the ring gear rotates counter-clockwise. This means the pinion gear tries to climb the ring gear, or rotate clockwise around it. That is the motion the transaxle mounts have to resist when accelerating.
On a Bus you add a reduction gear to each axle. The tires are still rotating counter-clockwise when going forward but the ring gear is now turning clockwise when viewed from the left side of the Bus. That means the pinion gear is trying to move down and pushes the front of the transaxle down when accelerating. |
That's what I though. I am not sure that I buy that assertion though. _________________ Chris
You know, a lot of these scratches will buff right out... Jerry Seinfeld |
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Jacks Samba Member
Joined: July 15, 2006 Posts: 2348 Location: San Clemente, Ca.
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Posted: Mon Aug 15, 2016 12:49 am Post subject: Re: Fitting 60's gearbox to 51 split. |
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splitjunkie wrote: |
EVfun wrote: |
looking at the left (drivers) side of the car, when you go forward the rear wheel rotates counter-clockwise. On a Bug that means the ring gear rotates counter-clockwise. This means the pinion gear tries to climb the ring gear, or rotate clockwise around it. That is the motion the transaxle mounts have to resist when accelerating.
On a Bus you add a reduction gear to each axle. The tires are still rotating counter-clockwise when going forward but the ring gear is now turning clockwise when viewed from the left side of the Bus. That means the pinion gear is trying to move down and pushes the front of the transaxle down when accelerating. |
That's what I though. I am not sure that I buy that assertion though. |
It seems as though you have never heard of Newton's third law, one of the physical laws of the mechanics of this universe. It's effects were published 250 years before the first VW was made. No VW's, or most other machines for that matter, would likely exist without at least some understanding of this law. But people still believe the world is flat. too. _________________ Jack Staggs
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splitjunkie Samba Member
Joined: April 04, 2006 Posts: 4095
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Posted: Mon Aug 15, 2016 7:43 am Post subject: Re: Fitting 60's gearbox to 51 split. |
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Jacks wrote: |
splitjunkie wrote: |
EVfun wrote: |
looking at the left (drivers) side of the car, when you go forward the rear wheel rotates counter-clockwise. On a Bug that means the ring gear rotates counter-clockwise. This means the pinion gear tries to climb the ring gear, or rotate clockwise around it. That is the motion the transaxle mounts have to resist when accelerating.
On a Bus you add a reduction gear to each axle. The tires are still rotating counter-clockwise when going forward but the ring gear is now turning clockwise when viewed from the left side of the Bus. That means the pinion gear is trying to move down and pushes the front of the transaxle down when accelerating. |
That's what I though. I am not sure that I buy that assertion though. |
It seems as though you have never heard of Newton's third law, one of the physical laws of the mechanics of this universe. It's effects were published 250 years before the first VW was made. No VW's, or most other machines for that matter, would likely exist without at least some understanding of this law. But people still believe the world is flat. too. |
My point is, yes when you flip the ring gear the axles themselves rotate backwards so that is the first "action" which would cause the "opposite reaction" cited.
However you then add the reduction gears (a second "action") which causes the final drive stub axles to rotate forward thus cancelling out the "opposite reaction" caused by the flipped ring gear. _________________ Chris
You know, a lot of these scratches will buff right out... Jerry Seinfeld |
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