How about a swap in "one way" or "limited slip" center diff for sand play and keep the "gear" diffs set for the track?

that's what i would do for starters - just buy a complete center diff to swap out, so you'd have a center diff with oil for each of the 2 tracks. it's not too tough to get the diffs out, but having to change oils would get old quick (tear the diff down, pour out the old oil, clean out well, put new oil in, etc.).

I don't follow, what is "one way" or "limited slip"?

either locked, or using very heavy diff oil so it seems locked (but with limited slip).

I think the one I got for my hyper 7 was actually called a "torsen differential" I'll see if I can get you a link.

Edit: tower hobbies has them if you search for it.http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXMVX9

I ordered my xt8 today, can't wait to get it!!

dang! thats like 5 in two months!!

Will these springs fit on the xt8?

http://cgi.ebay.com/XRAY-Spring-Set-...QQcmdZViewItem

I want to get some soft springs.