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Will a bus transmission bolt up to a Baja pan?
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jimbo slice
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PostPosted: Fri Jan 18, 2013 5:29 pm    Post subject: Will a bus transmission bolt up to a Baja pan? Reply with quote

Will a bus transmission bolt up to a Baja pan and engine?
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Bad_chopper
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PostPosted: Fri Jan 18, 2013 5:38 pm    Post subject: Reply with quote

bolts to the engine, need a different mounting plate to bolt to the frame horns. but you will have to cut a hole in the floor pan to clear the upper part of the nose cone, and run the shift rod above the tunnel. unless you get the 10deg mount.
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Mal evolent
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PostPosted: Fri Jan 18, 2013 6:20 pm    Post subject: Reply with quote

Daniel G wrote:
Converting to an IRS Bus Transaxle

Why Convert?
There are a couple good reasons...
1. Strength. They are a lot tougher (stock and built) than even a beefed T1 is for offroading.
2. Gearing. The bus transaxle has gear ratios that are much better for offroading than T1's do.

Mounting Styles

10-Degree Mount

This mounting kit tilts the engine and transaxle up 10 degrees for better ground clearance, and also allows you to run the shift rod in the same location as the T1 transaxle. It requires clearancing the frame horns as well as drilling holes into the bellhousing.

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Below is the original style made by Barrett Enterprises. Here is a thread specifically about it...

http://www.thesamba.com/vw/forum/viewtopic.php?t=149695&highlight=busintobug

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Here's another thread about it with more info about the newer style...

http://www.thesamba.com/vw/forum/viewtopic.php?t=119707

Solid/Strap Mount

This is the most common mounting kit used. It's cheap, simple to install, but IMO it's not the best way to do it. However, there's nothing wrong with it, and it works fine on plenty of buggies and bajas. This mount does not put the shift rod in the tunnel, so you must make provisions for this. You can either raise the shifter of get an adapter made to put the shift rod back down in the tunnel. Also, sometimes the bellhousing strap will have to be tweaked to fit around the starter boss. You'll see what I'm talking about if you use this kit.

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There is also a piece in the kit that bolts to the transaxle mount studs on the torsion housing and to the nose cone of the tranny, but I can't find any pics of it right now.

Bellhousing Mount

There are several different bellhousing mounts available. I know Kartek carries several different styles, and it would even be possible to fabricate your own pretty easily. You must have a roll cage to use this mount. This isn't an issue in a rail, but you will run into problems if you try to use this mount on a baja without a full rollcage in the rear.

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Mid-Mount

There are two different types of mid-mounts, and they are available for both stock frame horns and tubular frame horns, You must add tabs to the frame horns to bolt this mount to if you use it.

The first style bolts in between the intermediate housing and the main case of the transaxle. You must get the transaxle housing machined to be able to use this mount.

Tubular Frame Horns...

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Stock Frame Horns...

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The second style slips over the intermediate housing and attaches to the transaxle case studs. You may have to install longer studs in your case to use this mount, but you should discuss this with the vendor you buy it from, since I don't have that information at this time.

Tubular Frame Horns...

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Stock Frame Horns...

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Misc Mounts

These are some various other mounts I found pics of. I don't really have any info on them, but they may give you ideas for some mounts you can make yourself...

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When you convert to a bus transaxle, you must also change a few other things, such as your axles, CV's,stubs, and possibly the trailing arms. I will cover this briefly in another post, but since that is really a suspension issue, I won't go into much detail.

Daniel


swingarm pans need the frame horns notched for CV clearance, IRS pans do not.

http://www.thesamba.com/vw/forum/viewtopic.php?t=159897

http://www.thesamba.com/vw/forum/viewtopic.php?t=506745

http://www.thesamba.com/vw/forum/viewtopic.php?t=537726

http://www.thesamba.com/vw/forum/viewtopic.php?t=119707


final drive ratio is R&P X 4th gear. highly dependent on which chart you believe is the one true gearing chart

69 - 72 sedan trans: 4.125 X .89 = 3.67
68 002 trans: Avoid. hard to find parts. 6 acorn nuts on side cover
69 - 71 3 rib 002 trans: 5.38 X .82 = 4.41
74 - 75 5 rib 002 trans: 4.86 X .88 = 4.33
76 - 79 091 trans: 4.56 X .88 = 4.01
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jimbo slice
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PostPosted: Fri Jan 18, 2013 7:09 pm    Post subject: Reply with quote

You guys are awesome! Here's another one for you. Today I was attempting to put in some 3x3's and got everything tore apart but when I went to install the cv's they were too large to bolt to the output. Is this because they are for a bus transmission? And is there any way to get around this without needing to buy a bus transmission for the time being.
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Mal evolent
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PostPosted: Fri Jan 18, 2013 7:15 pm    Post subject: Reply with quote

without knowing what CVs you have, we can provide no reasonable answer.

what you may need is Thing CV flanges, which let you run Type 2 and Type 4 CVs on a Type 1 trans.

http://www.mooreparts.com/store/product/1377/AC525106/
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jimbo slice
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PostPosted: Fri Jan 18, 2013 7:24 pm    Post subject: Reply with quote

I'm assuming I have stock on the car. Is there a way to figure out by looking are the others?
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jimbo slice
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PostPosted: Sat Jan 19, 2013 8:44 pm    Post subject: Reply with quote

I see what you meant about the flanges, luckily I had the set to match the cv's. Very Happy
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