V.3 hybrid revo diffs in 3905 emaxx
 

Has anyone tried or maybe knows if the V.3 hybrid revo diffs will fit in the 3905 emaxx? I have a set of V3 but forgot to check and see what issues there would be trying to run them in my emaxx.

you would need cases specific to the Emaxx, Like UE or the FLM hybrid bulks. I'm sure someone else will chime in on other alternatives

As far as I know, the best way to get tough diffs for the Maxx is to cut away a little bit of the bulkheads and get some LST diffs for it. You'll have a hard time stripping a well-shimmed LST diff.

Hmm, I just took out 2 lst2 diffs in my lst2, 1515 2.5d on 6s with 23 pinion and 64 spur and stock lst2 tires. I purchased the truck as a used roller added all the brushless stuff and broke the two diffs, (tooth broke of pinion gears). The diffs were smooth when I received the truck, so I didn't open them up. My mistake I guess.

U E Diff Cases
 

I've just fitted UE diff cases with ofna six spider buggy diffs to my Emaxx 3905
they fit up perfectly with no shimming (in my case) and seem very tough - I used to detroy maxx spider gears every few packs even with maximiser cups and flm combo bulks Neil has been using them with hot bodies diffs and I havent heard that he's had any problems Im running 6s with a 1600Kv 80mm Medusa and loving it - you will have to gear up or pick a higher kv motor like the castle 2200kv