hi, i have a hyper 8 and am wondering how much oil do you put in the diffs? i got all the weights i need now. just need to know how much to put in? do u fill them completely? or just a little bit in? tried to fill one last night and it all poures out the bottom if you remove all the screws lol..

is there a method to doing this someone can post

You have to fill the diffs just above the crossed pins.NOT full.I did mine full and they blow it out on the first spin.Above the pins is around 3/4 full!!

As for the oil not coming out from the bottom just use something to block the holes from outsite of the diff.Roll some paper and put it in the holes,or use some kind of paste, or tape(though it might not stick there,...!

Aren't the Hyper8 diffs filled with oil from the factory?? Thats what I was told but I've yet to check mine but they sure feel like theres more than grease in there.

Factory settings for the hyper 8 is 3,000 weight oil front and center with tacky grease in the rear (1k oil is a good replacement for it). If you haven't even driven the buggy yet I highly recommend you do. If you start changing the settings right out of the box you don't have a good starting point to work from.

I'm not sure what your talking about by having the diff leaking. I don't have a hyper 8 myself so I don't know what diffs are in it. If your talking about the center spider diff then keep the spur gear on and unscrew the back side of the diff but leave the screws in on the gear side. Put it flat on a table to hold the screws in then fill up the diff 3/4 of the way. The front and rear diffs are only 2 piece instead of 3 piece like the spider diff. For those just take off the ring gear and after cleaning out the old oil/grease out just put in the new oil and close it back up.

I always fill my diffs 3/4 of the way just so there is minimal air in there. It makes the perfomance a little more consistant (bairly enough to notice)... its more of the way I like to do it over any type of performance gain . The diffs are designed to be full of oil though and I never had a diff blow because of it.

the hyper 8 has spider diffs front, rear and centre

they may be spider diffs in the uk but here in the u.s. they are regular diffs. my front and center had oil,
the rear had grease.