Originally Posted by
Ronborsk
Still running my original diff but man it got beat to heck even with shock limiters possibly from the rubber stock a arms and large jumps at a couple of tracks I visit. I know this is a rehash and have read this entire thread but don't know where things stand on this now...
Replacing arms with RPM right now, using shock limiters. I haven't done anything at all with the diffs in a while because of how worn out the bushings are on the diff and the fact that all diff oil leaks out too quick. If I use these RPM arms with limiters how well will the stock diff hold up? Perhaps I should have serviced them after every race?? That hurts if so as I;ve had other diffs hold up much better.
I tend to believe it was the soft arms causing the issues, they remind me of a toothbrush lol.
So, should I go stock diff or mod one with the bearing? Or, is someone selling the mod diff case already?
But then again, could a modded part ever be as good as AE's???? Sorry for that, all in good fun. I appreciate everyone's input.
I think I was one of the early adopters of the RPM arms. They lasted one race day at a big track, as they deform more quickly than the AE parts IMO. They are stiffer, if you run indoor they are likely fine. Mark them with a silver metallic sharpie on one side after you get them installed, and flip them L/R once a race day for maximum life (my AE arms now have 9 race days on them and are arrow straight since I started rotating them).
Many users had been using 5mm of uptravel limiters to keep the CVA's out of the outdrives. Hartson and Kory showed like 7-8mm of travel limiters inside their shocks. I have no idea why they did it, but it can't possibly hurt the outdrive, so I'd encourage you to look at using that many.
Problem is, that doesn't keep the diff bushing from wearing out. My CVA's have no marks on them from hitting the outdrives because I used 5mm of limiters right out of the box, but that didn't stop my outdrives from getting unacceptably wobbly.
I built a set of the bearing modified cases on my mill, but you could do the same thing with only a piece of 120 grit sand paper and some elbow grease. AE will eventually come out with one with a steel bushing, but I don't know if you want to wait that long for a fix you can do yourself with $5 in bearings.