front axal swap

dvrdwn · Posted: Fri Oct 10, 2003 5:55 pm Post subject: front axal swap

please try to read into this alittle because I don't think I am naming the part right. the whole assembly that the tires,tortion bars,steering box,steering damper is atatched to is rusting at the seams and I want to change it out. I have a 70 bay window and I want to change the above mentioned assembly out and replace it with a 72 assembly that I have. I know the 72 has disk brakes and 69 has drum. will all this match up?

thanks ahead of time for any help!

1NotchUp · Posted: Fri Oct 10, 2003 6:02 pm Post subject:

The only differences that I know of are the spindels, everything els will fit.

i.e. Drum brakes require drum spindels, disk brakes take disk spindels.

As for the suspention tube, I pretty sure it will fit.
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sixfootdan · Posted: Sat Oct 11, 2003 9:41 am Post subject:

I'm not so sure it will fit. Measure the distance between the top and bottom bolts that bolt the beam to the frame. There are 4 per side the spacing between the bolts changed around that year.
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jeremyrockjock · Posted: Tue Oct 14, 2003 5:18 am Post subject:

A 72 beam will fit in a 70 just fine. If you want to stay your original five wide drums then just change the spindles and do not run the brake booster from the 72. Just keep your original master cylinder in its original position. If you want to run disc brakes then you have to run a vacuum line from the engine for the brake booster, rerun the brake lines to the master cylinders new location, slave in the pressure reducer for the rear drums and swap your rear stub axles, drums and brake shoes. That is if you want all four wheels to match the five samll pattern. if you have any other questions I will be glad to help you. I have converted a 70 to disc brakes.
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1NotchUp · Posted: Tue Oct 14, 2003 9:46 am Post subject:

I converted my 68 westy to front disk without the booster and it didn't have any problem. It would still launch you out the front window if you wanted it to.

Isn't the master cylinder bigger on the non-boosted?
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dvrdwn · Posted: Tue Oct 14, 2003 5:07 pm Post subject:

1Notch did you notice if the front and rear brakes wore evenly?In other words engage evenly.

1NotchUp · Posted: Tue Oct 14, 2003 6:41 pm Post subject:

The fronts will always grab harder, it's like just about everything on the road. The noticable difference that I remember is that is was smoother when a panic stop was needed. I don't remeber any adverse pad wear. All I know is I liked the upgrade.
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jeremyrockjock · Posted: Wed Oct 15, 2003 3:44 am Post subject:

I am not positive but I think the master cylinder in the same on both. You can run disc brakes without the booster but that extra power is really nice. No more leg workout.
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1NotchUp · Posted: Thu Oct 16, 2003 1:32 pm Post subject:

Ok, heres the skinny.... I talked to "the guy" in the know.

68-70 axle beams are interchangeable.
71 is all by its self and will not work on a early or late front end. But the spindles will work on 68-70.

The master cylinder on a non-boosted assy is 19mm bore.
The master on a boosted assy is 17mm bore.

And he said the booster will not fit on a early beam because it's no facilitated for the booster mounts.

Thats how it was explained to me. Hope it helps.
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1NotchUp · Posted: Thu Oct 16, 2003 1:36 pm Post subject:

On more thing,
the stub axles are the only thing you need to be changed if you go with the small bolt pattern, the original backing plates will work.
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