ORIGINAL: Robby368
ok thanks for the info guys it looks like a diff rebuild is in order. I have an idea tho.
When I seperate the cases, I was thinking about cutting a thin groove around the outer edges and using a permatex or rtv sealer, pretty much to make a non-permanent gasket for the case, then making refiller hole on top and sealing it with a grub screw or somethin. I'd prefer an oil over grease, so hopefully that would help with the leaks.
And if that sounds like a good idea, how much should you fill the diff up? All the way? half way?
I've had a nitro sport or nitro rustler for many years. In fact it'll be 14 years this year. I've used many things to keep the diff holding together. Oil will only work for a short time no matter how you try to seal it. If you could get the cover sealed, the oil will still eventually leak out around the axle studs. I have used Silicone diff oil in the past but I would have to refill it every other time I ran it. (I used 30k fluid) You could use thicker but I think the end result will be the same. I would find some thick grease, or you could lock the diff. A Spool would work but its cheaper to use silly putty or epoxy putty. I have used both, The Epoxy putty being a more permanent/maintenance free option. Turning suffers a bit from this, but helps both tires get equal power.
If you lock the diff, you should glue the tires really well and balance them. Most tires wobble a lot and if not balanced will cause it to not launch straight.