My Xray XT8
 

Got this truck used for $200
with 4 sets of tires , brand new jammin shocks and spings , tons of parts and well its a beast.
Mamba Monster
Neu 1515 1y
custom mount ( will get mikes mount when i get the cash )

http://i183.photobucket.com/albums/x...n/GEDC0012.jpg
http://i183.photobucket.com/albums/x...n/GEDC0013.jpg
http://i183.photobucket.com/albums/x...n/GEDC0014.jpg
http://i183.photobucket.com/albums/x...n/GEDC0015.jpg
http://i183.photobucket.com/albums/x...n/GEDC0016.jpg
http://i183.photobucket.com/albums/x...n/GEDC0017.jpg
http://i183.photobucket.com/albums/x...n/GEDC0018.jpg
http://i183.photobucket.com/albums/x...n/GEDC0019.jpg

nice find

Cool conversion. I've seen a lot of the older XT8s go for really cheap lately.

thanks guys

im having a problem with the diffs no matter how much i shim them i still shred the pinion gear??? help!

Did you replace the bearings?

um no let me check

heres a pic

I'd replace the bearings and if you didn't replace the ring gear it should be replaced too since it is likely worn and will quickly wear a new pinion.

If new bearings don't help, carefully check the bulkhead for cracks. Under high force, a cracked bulkhead could allow the pinion to mis-mesh. I've beat the crap out of my XT8 and haven't had any diff issues yet.

Also, exactly how are you shimming? The pinion and/or the diff itself may need to be shimmed.

the shims between the ring gear and the bearing.
is there any other diff than xrays that will fit?

Judging by the type of wear you are getting on the pinion, it looks like it is a little too far off the ring gear and only the tops of the teeth are making contact. So shim the diff itself (via the outdrives) so the ring sits a little closer to the pinion (put some shims on the ring gear side of the diff). The pinion itself looks like it is in the right place because almost the whole tooth is worn evenly.

And, did you check for cracks in the bulkhead? They may only be visible when you twist them one way or another if they are hairline.

Not sure if any other diffs will work, but no matter what diff you use, you're gonna get the same results unless they are shimmed right. I would solve (or at least discover) the underlying problem first before you spend money needlessly. Just my $0.02.

ok so take it apart clean it and check it for cracks

I honestly think the issue is with one or a combination of the following (in order of what I think is most likely):
- improper shimming
- worn bearing(s)
- cracked bulkhead

heres the ring gear

no cracks in housing

yeah i think it needs more shims

The ring gear doesn't look quite as bad, but then again, the pinion will see 4.3X more wear than the ring simply because it has fewer teeth.

Shimming may take a bit of work to get so they mesh perfectly, but not too tight. And then, after several runs, you might want to take another look because there will be some wear and might need to tweak it a bit more. After that, they should be fine until they just wear out from extensive use or some other failure (fatigue, other part breaking , etc).

do i use light grease?

I just put enough to cover the ring gear. Most of it flings off when the gears are spinning at high speed anyway, so I don't think it matters as long as there is something on there.

yeah is 50,000wt ok?

I'm not sure. I just use whatever I have laying around. :oops:

You should replace the ring gear and pinion at the same time - a new pinion on an old, worn ring gear won't last as long or wear properly. Any thick grease on the gears is fine - it flies off anyways, but a light coat will remain.

yeah same here
i think this pinion is trashed. even shimmed to the max it still grinds. the bearings seem to have rounded out the housing so it has a tiny bit of play. that may be a suspect.

could i just swap with buggy diffs and pinions and gear down?
caster parts are much cheaper than xray lol

ok i swapped with Ex-1 diffs and to say the least they are much better built than xrays and they are alot smoother too. but they are buggy diffs so i had to gear down but thats ok im running 9/48 but im switching to 11/48 for a little more top end. will be ordering caster truggy rings and pinions to replace xrays diff.

FYI, I just opened the diff on my XT8 (ripped the shocktower off the bulkhead doing repeated stupid jumps :smile:) and noticed that the pinion has two shims between the pinion and the bearing (pushing it closer to the diff). The gears look in very good condition considering the punishment I put this truggy through, and it wasn't new when I got it (got it from a member here).

I know you came up with a different solution, but just thought I'd toss how mine is set up for kicks.

did you just say caster diffs are much better than xray???????

yes my xray diffs are just worn i think. caster is cheaper.:yipi: not saying better