Erco 091 trans bus to bug housing adapter

[mr white]

Hello everyone,
Does anyone have pictures or a good explanation of the process of how the erco adapter housing installs onto a 091 bus trans to make it work with the type one slider rails and nose cone to install into the type 1 pan?

[Dougy Dee]

It's quite simple. Completely tear down your 091 trans. Take all the gears from the gear carrier and swap them in to your new gear carrier. Adjust everything and put it back together...
A Bentley will help.

[mcmscott]

[[email protected]]

Rancho has a listing for an 091 housing. Are they NLA?

https://www.thesamba.com/vw/classifieds/detail.php?id=1177198

Hey Scott, did you ever find any more of the 6mm roll pin IRS Superdiffs?

[mr white]

mcmscott is correct. I received some pics today from Rancho. Trying to figure out how to upload them from my email now. Some clearance of the 091 case is needed.

[[email protected]]

Mcmscott is correct about not having any info/manual on how to assemble a trans with this housing, and there are a few things other than disassembly/reassembly. Unless they are no longer available, Rancho has an Erco housing that uses a late bearing.

Early

Late

[mcmscott]

[Casting Timmy]

Hopefully Scott will add what I miss, but I have been trying to collect notes on the conversion when people talk about it.

Clearance main case
T1 Shift rails needed
1-2 rail has to be cut down
T1 Reverse parts needed (lever, eyelet, etc)

[Wreck]

The Erco housing fitted to a 5 rib housing , running an eco 4.56 R&P with an old albins mainshaft . I've just about completed the mounts to fit into a '69 Ghia without cutting or welding to the frame horns . using GM gearbox mounts that can be changed without removing the engine . I can post pictures of the mounting system if people are interested .

[j-dub]

[Wreck]

still mocking up , I also shortened the nose cone and hockey stick by about an inch to move the box as far forward as possible . waiting for flat washers etc , also starting to fab up supports for the frame horns and fitment of oil coolers etc . It's going into a '69 Ghia with a 2.6 type 4 .

[VWBobby]

I'm looking into doing this conversion to my bus, currently using IRS T1 SSC trans. With the way the trans is mounted, have you figured out axle length? Are the axles equal length with the trans mounted the way you have it?

Thanks in advance!

[[email protected]]

What length are you using now? In a Beetle torsion/suspension, a common length axle the off-roaders would use when switching to a Bus trans is 15 5/8. This would be from a stock Beetle axle of 16 1/4. Any conversion I've come across centered the diff to have equal length axles, but the bell housing on a Bus trans is offset from the centerline.

[Wreck]

I used 15 5/8 axles , the box is slightly off set one way to get the engine closer to centre , (it's still off set ) .

[Bruce]

[Casting Timmy]

[VWBobby]

[[email protected]]

Is this a Bus that would have normally had a Type 1 style swing axle trans with the gear reductions, or one that would have originally used an IRS trans? Are you using Type 1 IRS arms from a Beetle, or Type 2 arms from a later Bay Bus? The stock axles for the Bay Bus would be 18 3/4. If that's what you are currently using, you may be able to get a high performance version of them that have longer CV splines, and trim the axle to the length you need. Then you could simply cut new c-clip grooves on the ends. Other than that, you may have to cut/splice a stock axle for mock up, then have a custom set made once you have determined the length.

[VWBobby]

[Multi69s]