Gears & Axles - what would have to be done to convert a 3 channel 12 bolt ot a 4 channel?
11-19-2008, 02:34 PM
I am looking into buying a 3 channel 12 bolt but i would need to convert it to a 4 channel for my car what would I have to do? I really don't want to have a bunch of lights on in the car so I would rather just convert it to a 4 channel.
Thanks in advance for any help.
11-19-2008, 02:35 PM
I think you have to get different axles cause of the relutor wheel....let me find a link
11-19-2008, 02:38 PM
Three channel rear end has ABS. A 4 channel rear end has ABS and traction control. A 'channel' is just a way of describing the means for a speed sensor to gauge the wheel speed. On a 3 channel rear end, the two front wheels have sensors, and there is one sensor on top of the rear end housing that reads for the whole rear. On a 4 channel rear end, there is a speed sensor at every wheel. 4 channel rear ends have reluctor wheels on each axle, 3 channel rears have one big reluctor ring on the differential. Because a 4 channel has a sensor at each rear wheel it can see the difference in speed between one wheel and the other, and you have traction control.
11-19-2008, 02:42 PM
Hope this helps
11-20-2008, 07:43 PM
Hope this helps
That is going the other way though.
You basically have to get your reluctor/exciter rings on the axles and the sensors into the backing plates. Should be able to get your axles machined by Moser but I'm not sure of the cost or what the turn around time is. You can reuse your old backing plates with the sensor still in there or drill a hole in the new backing plates and swap them over. I am unfamiliar with a 12 bolt so I don't know if you can just slide the backing plates off of the axles(like you can with the 10 bolt) or if they are held on by the axle bearings (which is how 9 inch axles are).
I just went through this same thing but with a 9 inch. I was going to get the axles machined and then have the rings and backing plates swapped over and new bearing pressed on but the local machine shop wanted about 200 to do this and couldn't do it quickly.
So I just ordered new axles that were already machined for the reluctor rings, removed my reluctor rings with a pry bar then heated them in boiling water and tapped them onto the new axles, and then put my original 10 bolt backing plates on and had a shop press on the bearings. I then resold my original 9 inch axles complete with bearing and backing plates and got about $250 from those.
Hope this helps!
11-21-2008, 09:58 AM
oops your right my bad :emb:
11-21-2008, 02:56 PM
^^Yeah I looked all over that guide when I was doing mine but it doesn't really say much about going 3 to 4 ch. but Bob at EPP helped me out on what I would need to do before I even bought the used 3 ch. and then when I pulled out the axles/backing plates it made sense. It's pretty easy to do, it just costs a little to get it all done.
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