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Topic: Bus gear reduction questions.  (Read 10021 times)

Offline Hydrocarbon Rocket

  • Joined: Aug 2011
  • Posts: 8

Bus gear reduction questions.

« on: August 29, 2011, 09:27:55 PM »
I have the bus gear reductions under a 69 baha.I have no idea what year this set up came from. These have got me lifted up high enough to stratle a stump.  What I was thinking of doing is reversing these so they will have a lowering efect. I've been wanting to build a lowerd rat out of this thing. Has anyone fliped the gear reductions over to try this or do you know if it will work? I can fabricate a new arm to bolt to but the gear oil may be the only issue that I may have. Please any comments on this. I really like to use what I have so changing to another system will be last option.

Offline attack chicken

  • Ooltewah
  • Joined: May 2007
  • Posts: 421

Re: Bus gear reduction questions.

« Reply #1 on: August 29, 2011, 10:13:49 PM »
I think most will just tell you to ditch the gearbox trans and go back to a swing axle bug setup.  By just doing that it will lower it a good amount and you have the ability to slam it if you wanted.  Reduction boxes came from busses, a street beetle probably can't benifit from them in any way UNLESS you want it in the air. ???

Offline volksnick

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  • Chattanooga
  • Joined: Apr 2009
  • Posts: 4304

Re: Bus gear reduction questions.

« Reply #2 on: August 29, 2011, 11:25:33 PM »
See if you can figure out which pan you have. Just cause its a "69" doesn't mean its not a different year pan. Check the VIN under the backseat, should be able to tell you what the chasis year is. If it is an actual 69, then you have the mounts for the IRS transmission which 1) are cheap and easy to find all day long, and 2) don't have huge camber issues like the earlier swing axles do. If it has those mounts (near where the frame horns come out from the torsion housing), you could convert it back for minimal costs and probably trade the gear reduction box set-up for it or break even. I wouldn't bother trying to make it work.

For what its worth, lots of people have taken them out of buses because it greatly limits your ability to keep up with traffic. I think top speed is right at 55 or 60 mph and thats pushing it. But if you are going to keep it a baja, then it would be nice to have the lower gear; I've been the baja jumping up hills and rock faces and you break a lot. I would have loved to have a lower gear. Post up some pictures of your bug. Is the rat rod going to be for the 14 year old or do you have two projects?

Offline Ret.Bugtech

Re: Bus gear reduction questions.

« Reply #3 on: August 30, 2011, 09:14:42 AM »
The chassis # is on the tunnel by a cover plate where the shift coupler is .   The first 3 #s will be 118 for a '68,  119 ='69 , etc,etc.  The '69 was the first 4 spd  car with IRS ( '68 Auto-Stick was the very first VW car with IRS). I would be interested in how the Bus transmission was mounted at the spring plate. A while back someone was making an adapter plate that mounted on the cars org. spring plate to the Reduction boxes. Can you post a photo or two at that hook up. It would help to tell you which type of Type- 1
 Bug tranny to use. Like Chicken said , don't even think about messing around trying to Flipping the boxes over.
« Last Edit: August 30, 2011, 09:20:14 AM by Ret.Bugtech »

Offline Hydrocarbon Rocket

  • Joined: Aug 2011
  • Posts: 8

Re: Bus gear reduction questions.

« Reply #4 on: August 30, 2011, 07:08:32 PM »
I will try to get up pics as soon as I dig it out of the corner and out from under a pile of stuff. Gonna try to start working on it again in the next 2 or 3 weeks. This is the machine that we will make into a rat or finish it as a ba-ha.

If I go rat, I'm gonna put the biggest set of tires that I can put on it but, have the body as low as possible. I have some 34" radial buckshots that I will use for the rat or ba-ha. That's why I was wanting to keep the gear reductions. I have 31s on it now and it don't seem low speeded. That being said, I am used to 4x4's and Rock Crawlers so this thing is geared like an airplane to me.

It has a ball joint front end that I cut the spindle out and made a 4 inch extension plate for lift relocating the spindle. Its not the strut front end.


My plans will also to be to convert it to run on propane either way I go. I am in the propane industry and even my Motorcycle runs on propane.


I do need some inspiration to get back on this thing and you guys are already getting me inspired. I'm probly gonna go to the circle wagon thing in the Smokey's in Oct to get some more stuff, ideas and more inspiration.

Offline Hydrocarbon Rocket

  • Joined: Aug 2011
  • Posts: 8

Re: Bus gear reduction questions.

« Reply #5 on: August 30, 2011, 07:23:17 PM »
This is the only pic I have at the time. This was back in July of 08 when the other projects started. I had just got thru building and stretching the sammy in the pic and caught the ba-ha in the background. I have since put new 35s on the sammy and will use the old tires off it on the ba-ha or rat, whichever it becomes. Thinking of calling it a Reversed Ba-Ha Rat if I can pull of whats in my head.

Offline 74loaf

  • Hixson, TN
  • Joined: Jun 2008
  • Posts: 303

Re: Bus gear reduction questions.

« Reply #6 on: August 30, 2011, 07:29:57 PM »
oOOOooo I do like samurais.... they do well off road

Offline volksnick

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Re: Bus gear reduction questions.

« Reply #7 on: August 30, 2011, 08:07:15 PM »
I like the idea of the rat, but it looks like baja is in your future just based off of everything you have already done and have. The giant tires and the lifted front end, along with the RGBs, seems like you'd be easiest to keep it a baja and you'd be surprised where you can go with it.

I took my baja to Uwharrie National Forrest in NC and surprised everyone with what I could do with it. I has 31x15.50x15s on the rear and 7.00x15 NDT military tires on the front. I had about 14" of clearance with that and a little reindexing the springs. If I had strapped the transmission down with the tranny strap, I would have been unstoppable, but I broke the nose cone mount on the hill that everyone says you need to be locked front and rear. I still drove out.

I like both, but baja's are really cheap to build and easy to find parts for it. CYW in sevierville has lots of offroad parts. Can't wait to see it.

Offline Hydrocarbon Rocket

  • Joined: Aug 2011
  • Posts: 8

Re: Bus gear reduction questions.

« Reply #8 on: August 30, 2011, 09:30:13 PM »
I like the idea of the rat, but it looks like baja is in your future just based off of everything you have already done and have. The giant tires and the lifted front end, along with the RGBs, seems like you'd be easiest to keep it a baja and you'd be surprised where you can go with it.

I do have an off-road background and yes it is closer to being done as a ba-ha than a rat. That is one reason I am leaning more toward the rat is to do something different. The body work on the rat will be much more forgiving than a ba-ha, (for me anyway). I know the ba-ha , is a capable off-road machine but, no way my samurai would keep up with it or no way it could go slow enough to run with me in the same terane. My riding terane is just not fit for the high speeds of the ba-ha.


I'm still at 50/50 right now.

Offline Ret.Bugtech

Re: Bus gear reduction questions.

« Reply #9 on: August 31, 2011, 09:42:28 AM »
I like the idea of the rat, but it looks like baja is in your future just based off of everything you have already done and have. The giant tires and the lifted front end, along with the RGBs, seems like you'd be easiest to keep it a baja and you'd be surprised where you can go with it.

I do have an off-road background and yes it is closer to being done as a ba-ha than a rat. That is one reason I am leaning more toward the rat is to do something different. The body work on the rat will be much more forgiving than a ba-ha, (for me anyway). I know the ba-ha , is a capable off-road machine but, no way my samurai would keep up with it or no way it could go slow enough to run with me in the same terane. My riding terane is just not fit for the high speeds of the ba-ha.


I'm still at 50/50 right now.
Another reason to not use the bus rec. tranny is that the ring gear runs in The reverse direction and has a habit of pushing the case apart when pushed hard.(ask me how I know this sometime) Then you walk home. With the tires you want to run ,a stock type-1 tranny will not get it. you would be running around in 3rd on flat ground with no torque(RPM) at all.  You might think about a Type-1 tranny with a much lower ratio ring/pinion installed or adapt a IRS bus tranny ('68-'71) . They have the lower ratio and are much stronger. Then you can kick 4x4 butt plus outrun them on good trails. Way to much fun when you had to pull a V8 CJ5 off the back side of Signal Mtn.Yuk yuk yuk ;D ;D ;D

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