Broke an axel cup and had an idea. No more broken axel cups!

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Damien05

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Well today while running i broke a front axel cup, which i heard was gonna happend so i was kinda expecting it. I had an idea when i took it out and man did it pay off. I noticed that the axel cup was very simular to the ones i have on the rear of my baja 5b, so i took one off my 5b and tryed it, and it worked! All i had to do was switch out the pins with the ones that came with my 5b axels and it fit like a glove. Ive been using FLM drive cups on my baja for a long time now and they show no wear and have a lifetime warranty. I think the ones that go on the diff's of the baja will work on the MT diff's but i haven't tried it yet, but when i do ill share.The pictures will so how I did it and ill post links to the ones i used. No more broken cups!


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This is the damage.


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This is the FLM drive cup next to the stock one. The FLM one is a bit longer but that isnt a problem with clearence issues at all.


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This is the stock axel pin next to the pin that holds the hub onto the axel cup. It can only be 4mm or it wont fit in, smaller will work but no thicker. It has to be a bit longer or the stock ones just slip out, these were the only ones i could find laying around and they're 22mm long so any pin that size should work, phatdad has a set that should work.


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As you can see it fits like a glove.


Well i hope this helps some people with broken axels, i know i was excited when i tried this out and found out that it worked, now i just gotta order more to finish the truck. Here are the links to what i used:


Axel cups. http://www.davesmotors.com/s.nl/c.885035/n.1/it.A/id.5178/.f


Pins. http://www.davesmotors.com/s.nl/c.885035/n.1/it.A/id.6390/.f


These arent the exact pins that i used, the only dfference is that mine don't have a grove, but the grove would be better. I might get these if mine ever break which they probably never will. Also you cant use the MT set pins that hold the hub pin on cause they wont fit into the cups, so just use the ones that come with the pins. Like i said, hope this helps.
 
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couple more pics

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The pins do stick out just a bit which is fine cause there wont be any way they'll slip out of the whole. Im still gonna do the shrink wrap mod so that the pins stay in tho.

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And here it is installed. As you can see there is no issues with clearence with anything. I turned the hub all around and it doesn't bind or anything, perfect fit.
 
Nice. I had the same idea. If you run stock Baja outer cups you could run DS Toobz. Combine those with the MCD dogbones and the Moo cups I have on my MT, it'd be bomb proof.
 
shrink wraps

Damien05 said:
couple more pics
P1000255.jpg


The pins do stick out just a bit which is fine cause there wont be any way they'll slip out of the whole. Im still gonna do the shrink wrap mod so that the pins stay in tho.

P1000257.webp

And here it is installed. As you can see there is no issues with clearence with anything. I turned the hub all around and it doesn't bind or anything, perfect fit.
Click to expand...
I had my pins fall out before. where do buy your shrink wraps and what are they called? Thanks.
 
any auto store like napa. I haven't gotten any so i don't know the exact size i need but it shouldnt be hard to find. theyre called shrink tubing and theryre found in the electrical section.
 
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Well I have the cups and bones installed and from what I can see it should work. I ran out of light tonight but I'll do a full running tst tomorrow and I'll let you guys know how it works out.
 
Well i think i finialy figured it out. Let me explain how i got to where i am now. Ok so the first version was with 4mm pins, figured they'd be long enough but they werent, they poped out after the first turn. So i brought the truck back in and went back to the drawing board. So i knew i needed them to be longer, but i didnt want them too long cause of clearence issues in the hub carrier. So i decided to make my own. I looked around and i found some old stock baja 5b shock shafts, put them in the axel cup and they fit perfectly, all i had to do was trim them to size. So after an hour or so of trying to make them long enough that they wouldnt pop out but not too long that they would hit the axel carrier. I finially got them to the point that if i made them any shorter, they would pop out so i had to trim the hub carrier. Did a little bit of trimiming to the point that they didnt hit the carrier so i figured i was good... no. I took it for a test drive and after a few mins i noticed that it was driving funny. I brought it in and found out that the pins broke. After looking at it i found that the bolts that held the hub carrier on the truck were hitting the bolts. So i took the bolts out and trimed about 4 threads off to make them short enough that they wouldnt stick out of the bottom of the holes, but still held. Well after that was done i took it for another test run. Everything was going good, then i brought it in and saw that one of pins was loose then fell out. So i took it all apart again and saw that one of the grub screws that held the pin in place was backed off a bit and damaged. At this time i was useing the stock driveshafts from the v4 MT which had the screw on the side of the ball and i ordered some new shafts that had the screw at the end of the shaft, so i tired those. And they acually worked. I took it for a test run after i installed them and they held in no problem. I brought the truck in and took it apart and the screws were still tight, the pins were still in place and everything was just as i installed it before i took it out. So after a very long process i finially found a solution to using aftermarket drive cups so that they woulnt brake anymore. Im gonna stick with the pins that i made until or if they brake, and if they do ill just order a set of heavy duty shock shafts and make them to size, and that should be stronger. So far i only took them for a 30 min test run, but ill try to update after a few more runs to see how they hold up. Here are a few pictures of what i did.

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This is whats left of the axel shaft that i cut for the pins.

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Here is the pins i made compared to a stock pin.

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This is what it looks like in the cup, they did stick out a bit so i had to make some triming. Any shorter and the pins would pop out so they had to be this long.

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And here is the triming i had to do to make them work. It aint pretty but it works.

Well guys i hope this shows that with a little work, you can put aftermarket drive cups and have them be much stronger than stock.
 
Re: Broke an axel cup and had an idea. No more broken axel cups!

That looks like a good setup there
 
Re: Broke an axel cup and had an idea. No more broken axel cups!

Curious as well. How is it holding up dude???
 
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