Official Erevo 1/8 scale center diff thread

[simplechamp]

Well, today was a very bad day. The machine shop called and said they drilled the holes in the output shafts but that the hardened cap was too hard and they weren't even able to make a dent in it. I can't see how this is possible. I told them people have drilled/tapped these in their home workshops and they just said "I don't know what they did but we can't do it, it's too hard". I think the are BSing me and just didn't want to do the work for the price they quoted me. When I first talked to the guy he said "I don't think this is as hard as everyone has told you". Yeah right....

So then I go pick everything up thinking "Well at least they drilled the output shaft pin holes" and the holes are drilled too far in on the shafts. The shafts aren't flush with the gear, they stick out past them. I had written 0.229" on my drawing but I haven't measured yet to see if they drilled the wrong distance or if 0.229" is wrong. It's my own fault for not double checking it myself.

At this point I don't even know what to do. Output shafts can be ground down to make them flush, but they might be too short now, and I guess I'll have to try drilling/tapping the hardened cap myself without having access to proper tools. Everything was going so well....

EDIT: I'll post some pictures of the shafts with gears when I get home, maybe you guys can see if I'll still be able to salvage them.

[mistercrash]

Take your output shafts and mount them in the diff with all the gears and pins and gaskets and O rings but mount it dry, no lube in the diff. If you can tighten the screws of the spur gear in the diff case all the way down tight and snug that will be good. Now if the output shafts turn with no excessive binding then you're fine. If the shafts really are too long for you to tighten those screws on the spur then grind them down a tiny bit and still you will be fine. Remember that what bolts on the output shafts are ''slider'' shafts so even if you're off by 0.005'' it won't make a difference, it will still work fine.