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Thread: How to: Building custom width Twin/Mad Force axle

 
 
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Old 11-08-2006, 09:10 PM   #1
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Default How to: Building custom width Twin/Mad Force axle

I'm constantly getting Emails and PM's about building custom width Twin axles. It's no biggie,just thought maybe if there was a thread it might help explain better and give people a place to ask questions. Mods,feel free to sticky this if you like.

First off,my pictures didn't turn out all that great so I just scanned pics from my manual to help with this. If anyone has any question,just post up and I'll try to answer. If somethings unclear,I can try to edit the steps to make it easier to understand.

The beauty of Twin/Mad Force axles,you can build dang near any width you want. As long as you have a dog bone that'll fit in the drive cups and stub shafts your golden.



Step 1. Assemble the center section with diff or spool inside and ready to run. (see picture below)




Step 2. Insert the hub carriers as if you were going to assemble.


Step 3. Slide desired dog bone into axle tube and make sure it's all the way into the drive cup on the differential.


Step 4. Measure the distance between the pin on the dog bone and the knuckles pivot point. The knuckles pivot point is the hole that the 5mm bolt and collar goes through on the hub carrier(See picture below,red arrow). This distance is the amount of increased or decreased width you will obtain.




Step 5. To decrease width,it's simple. Just cut off the measurement you got in the previous step from the assembled diff housing in step 1 and assemble the axles.


Step 6. To increase width,you will need extra hub carriers. Depending on how wide you go will determine how many extra hub carriers you need to buy. I believe you can get an extra 2 inches or better with each hub carrier. If you want to gain 1" of total width and put the pig right in the center of the axle,you'll need 2 extra hub carriers(1 for each axle). In my honest opinion,adding roughly 1" of total width and running 2 long side axles is about as wide as you'll ever need. Any wider and it gets a bit to wide.


Step 7. To add the extra width,pay no attention right now to the smaller section of tube(the section that slides inside the outer axle tube). From the spot where the tube changes size,measure over towards the hub carrier(remember the measurement you made?) and make your mark(See picture below). Cut this section off a hair big and sand with a disc to the exact distance then clean edges with a file or sandpaper. Make sure you don't cut to small,if you do,your screwed and that piece is junk. If anything,leave the cut piece a hair big. Even if it's an 1/8" big thats O.K.,we'll deal with that in a bit.



Step 8. Now slide the cut piece into your assembled diff housing assembly and either CA glue them in or screw together. I've used screws to do this and I've used CA glue also. Either way seems just as good as the other and I've never had a tube fall apart.


Step 9. If your gonna glue these together and still run the factory 2 link arms for link mounts or servo mounts,better install them now. Now we'll slide the final and outer section (hub carrier) into the cut section and attach with either screws or CA glue.


Step 10. Slide your new dog bone into the axle tube and make sure it's all the way into the drive cup on the diff. Once installed all the way,see how the pin on the dog bone lines up with the hole in the hub carrier. It should be centered with the hole. If it's to short,don't sweat it,if it's about 1/8" to short,just take a ball point pin apart and cut about 1/8" off the spring. Dip the tiny section of spring into grease or Vaseline,this will help keep the spring on the ball while sliding down the axle tube. Attach the greasy spring to one of the balls on the dog bone and slide the dog bone (springside first) down into the drive cup on the diff.


Step 11. Now you can assemble the rest and put your knuckles,wheels and tires on and your ready.


Step 12. Double check all your joints,weather you screwed them together or CA glued them,make sure everythings tight and commence the rest of your build.

Last edited by Reflection; 02-27-2010 at 08:34 PM.
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